CN2189116Y

CN2189116Y - Front-paddle rectification conduit

Info

Publication number: CN2189116Y
Application number: CN 94206493
Authority: CN
Inventors: 钱文豪
Original assignee: NO 708 INST NO 7 ACADEMY CHINA
Current assignee: NO 708 INST NO 7 ACADEMY CHINA
Priority date: 1994-03-09
Filing date: 1994-03-09
Publication date: 1995-02-08
Anticipated expiration: 2004-03-09

Abstract

A front-paddle rectification guide pipe belongs to an additional energy-saving device at the tail of a ship. The propeller consists of one semi-ring or two semi-rings, the section of the semi-ring is in a long C shape with smooth curves or broken lines, and the semi-rings are arranged in front of the propeller, above the propeller shaft and on one side or two sides of the stern. The vertical section of the semicircular ring of the long C-shaped rectifying guide pipe can provide 80-100% of the total energy-saving effect, so that the energy-saving effect is 20-40% (plump ship) and 50-100% (ship with square coefficient less than 0.75) better than that of the C-shaped rectifying guide pipe, and the vibration caused by the propeller is reduced. The wake flow control fins are additionally arranged on the upper part of the rectifying tube or 1-3 guide fins are additionally arranged on the front ship body on the lower part of the rectifying tube, so that the energy-saving effect can be further improved.

Description

Shrouding tube before blade

The utility model relates to the preceding commutation tube of a kind of boats and ships afterbody energy saving appendage, particularly oar.

The product confrontation propulsion of ship efficient of propeller for vessels influent stream has decisive influence, because the viscous effect of water, plumpish ship, stern current can produce separation and the influent stream quality is worsened, and screw propeller both sides influent stream quality is also inequality.The method that improves the influent stream quality has two kinds, and a kind of is to work hard on molded lines, as replacing former conventional tail or ball tail with novel molded lines such as asymmetric tail, tunnel tails, can further improve propulsion coefficient.But these methods are only applicable to new ship, and initial cost is bigger.Another kind method is to load onto the energy-conservation additional device of adjusting fluidised form on the quarter, not only is suitable for new ship and also is useful in the boat oceangoing ship, and initial cost is little, and is simple.But two semicircular ring were formed about at present the C type commutation tube that adopts was, be installed on oar before, oar axle top, energy-saving effect is 6～9.5%, sees CN87216893u because that this C type commutation tube cooperates with the current influent stream is not good, energy-saving effect is still undesirable.

The purpose of this utility model is a kind of more effective commutation tube of design, improves energy-saving effect and propulsion coefficient.

The purpose of this utility model is achieved in that before screw propeller, settles long C type structure rectifying conduit replaced C type structure on the hull of oar axle top.This long C type commutation tube is made of a semi-ring or two semi-rings, when adopting a semi-ring, is installed on the stern one side hull, and when adopting two semi-rings, two semi-rings are installed on respectively on the hull of stern both sides.Studies show that in most of the cases dextrorotation oar situation only being adorned left semi-ring commutation tube just can reach the effect that left and right sides semi-ring is all adorned, even it is higher, only when the actual influent stream operating mode of screw propeller and design effort condition difference are very big, the dextrorotation oar just occur and install the tangible situation of the long C type of right semi-ring commutation tube energy-saving effect additional.Research shows that also the vertical section of commutation tube semicircular ring provides 80%～100% of total energy-saving effect, and the big segmental arc up and down of arc radius is difficult for working good with the current influent stream, and self resistance is big, plays negative interaction sometimes.

Therefore adopt long C type commutation tube to increase the length that produces the effective thrust section, can more give full play to reducing or eliminating the centrifugation of boats and ships afterbody current, make the screw propeller influent stream even.Under the intensity of conduit, condition that rigidity all meets the demands, the energy-saving effect of long C type commutation tube is than the plentiful boats and ships of C type commutation tube 20～40%() and 50～100%(block coefficient less than 0.75 boats and ships).Adopt the utility model also to have the following advantages in addition: before commutation tube is positioned at oar, can cavitation not degrade, long C type commutation tube can reduce the caused vibration of screw propeller.Ship model disturbance force contrast test shows that the vibration damping magnitude is 17～52%; Ship model road-holding property contrast test and installation show that commutation tube does not have harmful effect to ship maneuverability, to preventing that floater from entering the oar card certain effect is also arranged.

Description of drawings:

Fig. 1 is loaded on the front elevation of stern for long C type commutation tube;

Fig. 2 is loaded on the lateral plan of stern for long C type commutation tube;

Fig. 3 is loaded on the birds-eye view of stern for long C type commutation tube;

Fig. 4 is long C type commutation tube tangent plane structural representation one simple type;

Fig. 5 is long C type commutation tube tangent plane structural representation;

Fig. 6 is for installing the front elevation of wake flow control fin additional on the long C type commutation tube;

Fig. 7 is for installing the lateral plan of wake flow control fin additional on the long C type commutation tube;

Fig. 8 is for installing the birds-eye view of wake flow control fin additional on the long C type commutation tube;

Fig. 9 installs the front elevation of fair water fin additional for long C type commutation tube;

Figure 10 installs the lateral plan of fair water fin additional for long C type commutation tube;

Figure 11 installs the birds-eye view of fair water fin additional for long C type commutation tube;

Embodiment:

The long C type of the airfoil commutation tube 1 that tangent plane is shaped as smooth curve or broken line is made of 1 semi-ring or two semi-rings, is installed on screw propeller 3 fronts, on the oar axle on the flat stern 2 one or both sides hulls.The left and right sides influent stream quality difference of screw propeller 3, one side is good, one side is poor, it is obvious that one side of difference installs the commutation tube effect additional, the opposite side Overlay was greater than 1% o'clock, both sides commutation tube semi-ring is all inequality about optimum embedding angle separately, the angle of throat of commutation tube and diameter usually also with about two semi-rings inequality for well; When the opposite side Overlay less than 1% the time, can save the commutation tube that this side is installed, do not influence energy-saving effect.

Long C type commutation tube 1 geometry and installation are measured with screw propeller 3 and are measured, load is relevant with stern 2 molded lines, and best metric is determined with ship model self-propelled test.Its span is: commutation tube 1 arc radius is 0.15～0.6 propeller radius; Commutation tube 1 outside to center buttock distance is 0.15～0.85 propeller radius; Conduit 1 vertical diameter is 0.3～0.7 diameter of propeller; The tangent plane chord length of conduit is 0.09～0.72 propeller radius; Conduit tangent plane maximum ga(u)ge is 0.12～0.18 conduit tangent plane chord length; Conduit angle of throat δ is 3 °～15 °; The horizontal back bevel angles α of conduit is 3 °～11 °; Conduit casterangle β is 0 °～9 °; Conduit camber angle γ is-2 °～10 °; Conduit and screw propeller fore-and-aft distance are 0.1～0.4 diameter of propeller.

For long C type commutation tube 1, with edge place dress conduit wake flow control fin 5, then the energy-saving effect of wake flow control fin 5 can reach 1～3% at an upper portion thereof.Wake flow control fin 5 measure with long C type commutation tube 1 measure and the load of screw propeller 3, measure relevant.Wake flow control fin 5 tangent plane shapes are extensions of commutation tube tangent plane shape, keep the fairing continuity, and its chord length is 0.2～0.7 conduit tangent plane chord length, and exhibition length is circular arc arc length on 0.3～1.0 commutation tube.

For long C type commutation tube 1, adorn 1～3 fair water fin 6 on the hull of front, every side semi-ring bottom.The setting angle of fair water fin 6 is decided by streamline test or ship model self-propelled test.Fair water fin 6 tangent planes are shaped as airfoil or plate shaped, and its mean chord length is 0.2～0.7 conduit tangent plane chord length, and aspect ratio is 0.5～1.8, and other are measured by ship model self-propelled test and decide.

Claims

1, a kind of commutation tube, be loaded on screw propeller front, oar axle top, the stern hull, it is characterized in that a. commutation tube (1) tangent plane is shaped as the long C type of smooth curve or broken line, b. commutation tube (1) is made of a semi-ring or two semi-rings, is installed on the stern one or both sides.

2, commutation tube as claimed in claim 1 is characterized in that commutation tube (1) arc radius is 0.15～0.6 propeller radius.

3, commutation tube as claimed in claim 1 or 2 is characterized in that commutation tube (1) outside to center buttock distance is 0.15～0.85 propeller radius.

4, commutation tube as claimed in claim 1 is characterized in that the vertical diameter of commutation tube (1) is 0.3～0.7 diameter of propeller.

5, commutation tube as claimed in claim 1, the tangent plane chord length that it is characterized in that commutation tube (1) is 0.09～0.72 propeller radius, the tangent plane maximum ga(u)ge is 0.12～0.18 tangent plane chord length.

6, commutation tube as claimed in claim 1 is characterized in that conduit angle of throat δ is 3 °～15 °; Horizontal back bevel angles α is 3 °～11 °, and casterangle β is 0 °～9 °, and camber angle γ is-2～10 °.

7, commutation tube as claimed in claim 1 is characterized in that fore-and-aft distance between commutation tube (1) and the screw propeller (3) is 0.1～0.4 diameter of propeller.

8, commutation tube as claimed in claim 1, it is characterized in that installing wake flow control fin (5) additional with edge on commutation tube (1) top, its tangent plane shape is the extension of commutation tube (1) tangent plane shape, and fairing is continuous, and its chord length is 0.2～0.7 conduit tangent plane chord length; Exhibition length is circular arc arc length on 0.3～1.0 commutation tube.

9, commutation tube as claimed in claim 1, it is characterized in that on the hull of front, commutation tube bottom, installing 1～3 fair water fin (6) additional, its tangent plane is shaped as airfoil or plate shaped, and the tangent plane mean chord length is 0.2～0.7 must manage the tangent plane chord length, and aspect ratio is 0.5～1.8.