CN113007139A - Method for processing and stabilizing casing of adjustable coupling type of gas compressor - Google Patents
Method for processing and stabilizing casing of adjustable coupling type of gas compressor Download PDFInfo
- Publication number
- CN113007139A CN113007139A CN202110269356.5A CN202110269356A CN113007139A CN 113007139 A CN113007139 A CN 113007139A CN 202110269356 A CN202110269356 A CN 202110269356A CN 113007139 A CN113007139 A CN 113007139A
- Authority
- CN
- China
- Prior art keywords
- casing
- compressor
- processing
- axial
- slot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/545—Ducts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/003—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by throttling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/56—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/563—Fluid-guiding means, e.g. diffusers adjustable specially adapted for elastic fluid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
本发明公开了一种压气机可调控耦合式机匣处理扩稳方法，该方法耦合了轴向缝式机匣处理与叶顶喷气式机匣处理结构，将轴向缝机匣处理置于压气机转子叶顶，于缝式机匣处理顶部加装一背腔体结构，然后与置于压气机叶顶前缘的喷气装置连通，在连通桥路上设置工业截止阀，由此形成了一种压气机可调控耦合式机匣处理结构。通过合理调控阀门的开闭，可以保证获得最大综合失速裕度的同时，极大地降低压气机的峰值效率损失。此外，通过对阀门及桥路宽度的调控，可以开发适用于不同压气机类型的变工况可调节扩稳装置。
The invention discloses a method for stabilizing the treatment and expansion of a regulated coupling type casing of a compressor. The method couples an axial slot type casing treatment and a blade tip jet type casing treatment structure, and places the axial slot casing treatment in the compressed air. The top of the rotor blade of the compressor is installed with a back cavity structure on the top of the slotted casing, and then communicated with the jet device placed on the leading edge of the compressor blade tip, and an industrial stop valve is set on the communication bridge, thus forming a kind of Compressor adjustable coupling case processing structure. By reasonably regulating the opening and closing of the valve, the maximum comprehensive stall margin can be ensured, and the peak efficiency loss of the compressor can be greatly reduced. In addition, by adjusting the width of the valve and the bridge, it is possible to develop an adjustable stability expansion device suitable for different working conditions of different compressor types.
Description
Technical Field
The invention belongs to the technical field of impeller machinery, and particularly relates to a method for processing and stabilizing an adjustable coupling type casing of an air compressor.
Background
Casing treatment has been widely used in engineering practice as an effective passive treatment method for improving the stability margin of the compressor. The casing treatment has the advantages of simple structure, easy realization, strong stability expansion capability, distortion resistance and the like. Over the years, a wide variety of casing processing configurations including slot, and self-circulation have been developed.
However, the results of the Study in the document "Takata H, F.H., A Study on Configurations of case disposal for Axial Flow compressors, bulletin of the JSME-Japan Society of Mechanical engineers,1984.27(230): p.1675-1681" have shown that there is no optimal case disposal structure under the conventional single structure case disposal design system, so that the case disposal can achieve higher stability margin without significantly reducing the efficiency of the compressor. With the continuous pursuit of modern high-load compressors for high thrust-weight ratio, high efficiency, high stability and other compressor performance, single casing treatment and stability enhancement methods that seriously sacrifice compressor efficiency in order to obtain sufficient stability margin have become increasingly unacceptable. Therefore, finding an effective way to expand stability that can compromise both stability margin and efficiency has become a critical issue for current casing handling studies. The existing circumferential groove, axial seam, self-circulation casing treatment and single variable optimization structure thereof can bring performance improvement of the gas compressor to different degrees, but still have great improvement space in the aspects of stability expansion capability and efficiency.
Disclosure of Invention
The technical problem solved by the invention is as follows: in order to avoid the defects of the existing single-structure casing treatment design and enable the passive expansion stability of the casing treatment to become adjustable and controllable gradually, the invention provides an adjustable and controllable coupling type casing treatment method of an air compressor.
The technical scheme of the invention is as follows: an adjustable coupling type casing processing and stability expanding method for a gas compressor comprises the following steps:
step 1: firstly, a plurality of discrete axial seams are axially formed on a compressor casing and are uniformly distributed along the circumferential direction to form an axial seam casing processing structure;
step 2: radially superposing a circumferential non-communicated back cavity structure on the top of the slot type processing machine box, wherein the radial centripetal side of the back cavity structure is communicated with the axial slot structure in the step 1, and the side of the cavity, which is axially close to the front edge of the rotor, is communicated with a nozzle structure;
and step 3: an axial rotation stop valve is arranged at the axial horizontal communication section of the nozzle, and the opening and closing of a passage between the cavity and the nozzle are controlled, so that an adjustable coupling type casing processing structure is formed.
The further technical scheme of the invention is as follows: the axial slot casing processing structure in the step 1 covers 50% -100% of axial chord length of the blade top.
The further technical scheme of the invention is as follows: the ratio of the seam width to the seam piece width of the seam type casing processing structure is 2:1, and the seam depth is 30% of the axial chord length of the blade top; the radial inclined direction of the slot is consistent with the rotation direction of the rotor, and the included angle between the radial inclined direction of the slot and the rotation direction of the rotor is 45 degrees.
The further technical scheme of the invention is as follows: the height of the bridge circuit is equivalent to the radial depth of the back cavity, and the radial depth of the back cavity is half of the seam depth of the seam type processing machine casing.
The further technical scheme of the invention is as follows: the air injection position of the air compressor casing blade top air injection device is located at the axial chord length of 60% of the blade top upstream of the blade top front edge.
The further technical scheme of the invention is as follows: the air jet device has an air jet opening adopting a Coanda nozzle structure to form airflow adherent flow, and the yaw angle is 10 degrees.
Effects of the invention
The invention has the technical effects that: by applying the adjustable and controllable coupled casing treatment and stability enhancement method for the gas compressor, comparison research on the solid wall condition and the opening and closing of a coupled casing treatment valve is carried out on an isolated rotor of an axial flow gas compressor experiment table. The results show that the comprehensive stall margins of the compressor in the solid wall state, the stop valve closed state and the stop valve open state are respectively 11.76%, 57.43% and 49.49%; the peak efficiencies were 91.9%, 88.1%, and 90.7%, respectively. Compared with the condition of a solid-wall casing, when the valve is in an open state, the coupled casing treatment can obtain 37.7% of comprehensive stall margin improvement, and the peak efficiency is reduced by 1.2%; when the valve is in the closed state, the coupled case process can achieve a 45.4% increase in the integrated stall margin, which is a 3.8% reduction in peak efficiency. The peak efficiency loss of the compressor is greatly reduced while the maximum comprehensive stall margin can be ensured by reasonably regulating and controlling the opening and closing of the valve.
Drawings
FIG. 1 is a three-dimensional schematic view of a process for an adjustable coupling type casing.
FIG. 2 is a front view of a process for an adjustably coupled casing.
FIG. 3 is a top view of an adjustable coupling casing process.
FIG. 4 is a meridian view of the process of the controllably coupled casing.
Fig. 5 is a three-dimensional schematic view of the whole process of the controllable coupling type casing.
Fig. 6 is a circumferential cross-sectional view of the process (shutoff valve open state) of the adjustably coupled casing.
Fig. 7 is a circumferential cross-sectional view of the process (shutoff valve shut-off state) of the adjustably coupled casing.
In the figure: 1-rotor blade, 2-axial seam casing processing structure, 3-back cavity structure, 4-variable width bridge circuit, 5-air injection device, 6-valve; z-axial direction, omega-rotor direction of rotation, Cax-tip axial chord length; h issThe depth of the slot-type casing treatment slot,
radial included angle for slot-type casing treatment, L-slot-type casing treatment slot length, WsSlot width, W, of slot casingb-slot casing processing slot width; h ispDepth of dorsal cavity, Za-jet casing treatment jet axial position, ccp-jet casing treatment circumferential coverage ratio.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Referring to fig. 1-7, the present invention couples an axial slot type casing treatment and a blade top jet type casing treatment structure, firstly, the axial slot type casing treatment is arranged on the blade top of a compressor rotor, then a back cavity is arranged on the top of the slot type casing treatment, finally, the radial centripetal side of the cavity is communicated with the axial slot structure, and the nozzle structure of the cavity axially close to the front edge side of the rotor is communicated. An industrial block valve is arranged at the axial horizontal communication section of the nozzle, and the opening and closing of a passage between the cavity and the nozzle are controlled, so that the adjustable coupling type casing processing structure of the gas compressor is formed. The stability expanding advantage of the controllable coupling type casing treatment is as follows: on one hand, when the valve is in a closed state, under the independent action of axial seam casing treatment, channel blockage caused by tip leakage vortex can be effectively inhibited, and the stability margin of the gas compressor is obviously improved; on the other hand, when the valve is opened, part of high-pressure airflow introduced at the rear section of the slot type casing treatment is sprayed into the main flow through the communicated air injection device, so that the strong mixing of the slot type casing treatment and the main flow of the channel is weakened, and the problem of overlarge efficiency loss of the compressor under the treatment action of the single slot type casing is solved. In addition, by reasonably implementing the opening and closing of the valve, the variable working condition adjustable stability expanding device suitable for different compressor types can be developed.
The technical scheme adopted by the invention for solving the technical problems is as follows: an adjustable and controllable coupling type casing processing and stability expanding method for a gas compressor is characterized by comprising the following steps:
the method comprises the following steps: firstly, a plurality of discrete axial seams are axially formed on the compressor casing and are uniformly distributed along the circumferential direction to form an axial seam casing processing structure. Preferably, the axial slot structure covers 50% -100% of the axial chord length of the blade tip;
step two: then, a communicating back cavity structure is arranged at the top of the slot type casing processing, the side surface of the cavity is communicated with a bridge circuit with a valve type mechanism, and finally the bridge circuit is communicated with an air injection device arranged at the front edge of the top of the rotor blade, so that an adjustable and controllable coupling type casing processing structure is formed;
step three: preferably, the slot casing process can cover 50% -100% of the axial chord length of the rotor blade tip; the ratio of the processing slot width of the slot type casing to the slot piece width is 2:1, namely the slot area ratio is 66.7%, and 120 axial slot structures are uniformly distributed along the circumferential direction; the depth of the slot is 30% of the axial chord length of the blade top; the radial inclined direction of the seam is consistent with the rotation direction of the rotor, and the included angle between the radial inclined direction of the seam and the rotation direction of the rotor is 45 degrees;
step four: preferably, the depth of the back cavity is half of the depth of the processing slot of the slot type casing, and the height of the bridge circuit is equivalent to the depth of the back cavity; the air injection position of the blade top air injection device is located at the axial chord length of 60% of the upstream of the blade top front edge; the air jet adopts a Coanda nozzle structure to form airflow adherent flow, and the yaw angle is 10 degrees; the circumferential coverage ratio of the jet casing processing device is 22.5%, and 10 jet structures are uniformly distributed along the circumferential direction.
The technical solution is further explained below with reference to specific examples:
the embodiment is a method for processing and stabilizing an adjustable coupling type casing of an air compressor. Firstly, a plurality of discrete axial seams are axially formed on a compressor casing and are uniformly distributed along the circumferential direction to form an axial seam casing treatment structure, and the axial seam structure covers 50% -100% of axial chord length of a blade top; and finally, the back cavity is communicated with an air injection device arranged at the front edge of the top of the blade of the compressor through a bridge circuit with a valve switch and adjustable width, so that the adjustable and coupled type casing processing structure of the compressor is formed.
The embodiment is applied to an isolated Rotor rotator 704 of an axial flow compressor laboratory table of northwest industrial university, and the basic parameters of the Rotor are shown in table 1.
TABLE 1Rotor704 basic parameters
In this embodiment, the slot casing treatment can cover 50% -100% of the axial chord length of the rotor blade tip; the ratio of the processing slot width of the slot type casing to the slot piece width is 2:1, namely the slot area ratio is 66.7%, and 120 axial slot structures are uniformly distributed along the circumferential direction; the depth of the slot is 30% of the axial chord length of the blade top; the radial inclined direction of the seam is consistent with the rotation direction of the rotor, and the included angle between the radial inclined direction of the seam and the rotation direction of the rotor is 45 degrees; the depth of the back cavity is half of the depth of a processing seam of the seam type casing, the height of the bridge circuit is equivalent to the depth of the back cavity, and the width of the bridge circuit is set as 30% of axial chord length of the blade top; the air injection position of the blade top air injection device is located at the axial chord length of 60% of the upstream of the blade top front edge; the air jet adopts a Coanda nozzle structure to form airflow adherent flow, and the yaw angle is 10 degrees; the circumferential coverage ratio of the jet casing processing device is 22.5%, and 10 jet structures are uniformly distributed along the circumferential direction.
Preferably, the basic geometry parameters of the process of the controllably coupled casing are as shown in Table 2.
TABLE 2 Adjustable and controllable coupling type casing treating geometry parameters
A multichannel unsteady numerical simulation research of the controllable coupling type casing processing is developed on an isolated Rotor rotator 704 of an axial flow compressor experiment table of northwest industrial university, and the implementation process is as follows:
1) a commercial software NUMCA FINE/Turbo integrated preprocessing software IGG/Autogrid5 module is adopted to generate a numerical calculation grid for processing a compressor rotor and a coupling type casing, and grid encryption processing is adopted to ensure the solving precision of the near-wall surface;
2) performing full three-dimensional unsteady numerical calculation on the generated calculation grid by adopting an Euranus solver in a NUMCA FINE/Turbo software package, wherein the calculation configuration is as follows: the rotor rotating speed is set to be a common rotating speed of 10765r/min, a Jameson finite volume method is adopted and a k-epsilon (low Re yang shi) turbulence model is combined, space dispersion is adopted to solve a three-dimensional Reynolds time mean square range under a relative coordinate system by adopting a TVD 2-order windward format, an implicit double time step method is adopted for unsteady calculation, a physical time step is set to be 180 steps, and a virtual time step under each physical time step is set to be 30;
3) and performing high-speed parallel calculation by adopting a 48-core high-performance computer, obtaining a numerical result and performing data processing to obtain the comprehensive stall margin and peak efficiency of the treatment of the adjustable coupling type casing under the conditions of the solid-wall casing, the valve opening and the valve closing.
Research results show that by regulating and controlling the coupled casing treatment, 37.7% of comprehensive stall margin improvement can be obtained by the coupled casing treatment when the valve is in an open state, and the peak efficiency is reduced by 1.2%; when the valve is in the closed state, the coupled case process can achieve a 45.4% increase in the integrated stall margin, which is a 3.8% reduction in peak efficiency. The peak efficiency loss of the compressor is greatly reduced while the maximum comprehensive stall margin can be ensured by reasonably regulating and controlling the opening and closing of the valve.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110269356.5A CN113007139A (en) | 2021-03-12 | 2021-03-12 | Method for processing and stabilizing casing of adjustable coupling type of gas compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110269356.5A CN113007139A (en) | 2021-03-12 | 2021-03-12 | Method for processing and stabilizing casing of adjustable coupling type of gas compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113007139A true CN113007139A (en) | 2021-06-22 |
Family
ID=76405973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110269356.5A Pending CN113007139A (en) | 2021-03-12 | 2021-03-12 | Method for processing and stabilizing casing of adjustable coupling type of gas compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113007139A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114576205A (en) * | 2022-03-14 | 2022-06-03 | 中国航发湖南动力机械研究所 | Efficient self-circulation processing casing with mode conversion |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030026695A1 (en) * | 2001-07-18 | 2003-02-06 | Juergen Schmuecker | Compressor casing structure |
| US20130318973A1 (en) * | 2012-06-01 | 2013-12-05 | Hitachi, Ltd. | Axial Compressor and Gas Turbine Having Axial Compressor |
| CN104405685A (en) * | 2014-11-20 | 2015-03-11 | 哈尔滨广瀚燃气轮机有限公司 | Self-circulation and circumferential groove hybrid treater box for improving performance of air compressor |
| CN106870461A (en) * | 2017-03-28 | 2017-06-20 | 中国科学院工程热物理研究所 | Compressor casing and apply its axial flow compressor |
| CN106870465A (en) * | 2017-02-24 | 2017-06-20 | 中国科学院工程热物理研究所 | A kind of compressor, gas turbine and compressor stability-enhancement synergistic method |
| CN107202036A (en) * | 2017-07-24 | 2017-09-26 | 北京航空航天大学 | It is a kind of at the same improve stator corner region flow self-loopa processor box |
-
2021
- 2021-03-12 CN CN202110269356.5A patent/CN113007139A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030026695A1 (en) * | 2001-07-18 | 2003-02-06 | Juergen Schmuecker | Compressor casing structure |
| US20130318973A1 (en) * | 2012-06-01 | 2013-12-05 | Hitachi, Ltd. | Axial Compressor and Gas Turbine Having Axial Compressor |
| CN104405685A (en) * | 2014-11-20 | 2015-03-11 | 哈尔滨广瀚燃气轮机有限公司 | Self-circulation and circumferential groove hybrid treater box for improving performance of air compressor |
| CN106870465A (en) * | 2017-02-24 | 2017-06-20 | 中国科学院工程热物理研究所 | A kind of compressor, gas turbine and compressor stability-enhancement synergistic method |
| CN106870461A (en) * | 2017-03-28 | 2017-06-20 | 中国科学院工程热物理研究所 | Compressor casing and apply its axial flow compressor |
| CN107202036A (en) * | 2017-07-24 | 2017-09-26 | 北京航空航天大学 | It is a kind of at the same improve stator corner region flow self-loopa processor box |
Non-Patent Citations (1)
| Title |
|---|
| 王维 等: "基于喷气与缝耦合的轴流压气机变形态失速控制机理研究", 《中国航天第三专业信息网第四十届技术交流会暨第四届空天动力联合会议论文集—S10发动机内外流一体化相关技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114576205A (en) * | 2022-03-14 | 2022-06-03 | 中国航发湖南动力机械研究所 | Efficient self-circulation processing casing with mode conversion |
| CN114576205B (en) * | 2022-03-14 | 2023-11-28 | 中国航发湖南动力机械研究所 | Efficient self-circulation processing casing with mode conversion |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106870465B (en) | A kind of compressor, gas turbine and compressor stability-enhancement synergistic method | |
| CN108661947B (en) | Axial-flow compressor blade using Coanda jet and axial-flow compressor using the same | |
| CN112539184B (en) | A distributed parameterized impeller self-circulation processing casing | |
| CN108487942A (en) | Control the casing and blade combined shaping method of turbine blade-tip gap flowing | |
| CN110145497A (en) | A self-circulating casing processing and stabilizing device for compressors moving axially forward | |
| CN103953448A (en) | Hypersonic air inlet channel | |
| CN106968988A (en) | A kind of axial advancement, the anti-blade of radial skew angularly stitch processor box | |
| CN113007139A (en) | Method for processing and stabilizing casing of adjustable coupling type of gas compressor | |
| CN114838002A (en) | Stability expanding processing device of self-circulation casing | |
| Cui et al. | Effects of width variation of pressure-side winglet on tip flow structure in a transonic rotor | |
| CN104454656B (en) | Flow control method adopting hole-type circumferentially slotted casing treatment with back cavities | |
| CN203962164U (en) | A kind of hypersonic inlet | |
| CN104153821B (en) | A kind of variable geometry turbine with variable stator vane angle from bleed-jet structure | |
| CN209444376U (en) | Using the blade of adaptive Condar jet | |
| CN111102012B (en) | Blade adopting self-adaptive coanda jet and manufacturing method | |
| CN106382260B (en) | A kind of tangential groove water conservancy diversion chip treated casing method and device of compressor | |
| CN105156361B (en) | Blade root opens up the Profile For Compressor Stator leaf grating of wide arc groove | |
| CN113007138A (en) | Design method for preposed combined casing of gas compressor | |
| CN108643974B (en) | Local spherical concave non-axisymmetric end wall modeling structure of the lower end wall of the leading edge of the gas turbine moving blade | |
| CN107762973B (en) | Compressor corner region stability-expanding blade and trailing edge groove forming method thereof | |
| CN108487943A (en) | The casing and leaf top groove design method moved based on bimodal function control room clearance flow | |
| CN102032214A (en) | Blade leading edge modification method for suppressing separation | |
| CN116733778A (en) | Axial compressor blade and axial compressor using same | |
| Xu et al. | Effect of interstage seal air-entraining jet structure on the corner separation and flow field structure of a compressor cascade | |
| CN105156356A (en) | Compressor stator cascade with blade root provided with equal-width broken line shaped channels |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210622 |