RU2003115178A

RU2003115178A - METHOD FOR DETERMINING FLOW PARAMETERS IN A COMPRESSOR AND A DEVICE FOR ITS IMPLEMENTATION

Info

Publication number: RU2003115178A
Application number: RU2003115178/06A
Authority: RU
Inventors: Наталия Николаевна Ледовская; Александр Николаевич Меркурьев; Ольга Николаевна Белошкурская; Сергей Владимирович Панков
Filing date: 2003-05-23
Publication date: 2004-11-20

Claims

1. The method of determining the flow parameters in the compressor, including measuring static pressure, pulsations of static pressure above the compressor impeller, instantaneous values of the amplitudes of the pulse signals from the frequency sensors of the compressor blades of the compressor wheels, determining the time-averaged static pressure and the time-averaged amplitudes of the pulse signals from the frequency following blades, characterized in that they measure the pulsation of the total and static pressure at the inlet and outlet of the compressor, and all The joints are produced synchronously, pressure isolines are built in each interscapular channel of the peripheral section of the compressor wheel during the passage of each interscapular channel and all channels in one revolution of the wheel and several revolutions, the boundaries of the compressor wheel channels are determined on the pressure isolines, the values of the end clearances are determined, the angles of the blades are calculated according to the formula

calculate the flow rate in absolute motion at the inlet and outlet of the compressor according to the formula

where φ is the angular displacement of the front and rear edges of the blades;

b is the axial distance between the frequency sensors of the leading and trailing edges;

C is the offset between the pulses of the rotor speed and the leading edge repetition rate;

α is the offset between the pulses of the rotor speed and the trailing frequency of the trailing edge;

λ _abs is the reduced flow velocity in absolute motion;

k is an isentropic index;

P is the instantaneous value of static pressure;

- instantaneous value of the total pressure in absolute motion.

2. A device for determining flow parameters in a compressor, comprising low-inertia pressure sensors, frequency sensors for following the impeller blades of the compressor, a visualization unit for the measurement results, a processing unit for the measurement results, a visualization unit for the processing results, characterized in that it comprises nozzles for measuring the pulsations of the full and static pressure unit, a block for synchronous input and recording of measurement results, a unit for determining instantaneous isolines of static pressure in each interscapular analgesia of the peripheral section of the compressor impeller, a processing unit for instantaneous amplitudes of pulse signals, a unit for determining pulsations of the flow rate, while nozzles for measuring pulsations of the total and static pressures are connected to the synchronous input and recording unit of the measurement results, which is connected to the secondary processing unit of the measurement results, comprising a unit for determining pulsations of the flow velocity in the input and output channels of the compressor, a unit for processing instantaneous values of pulse signals and a unit for determining instantaneous static pressure isolines in each interscapular channel of the peripheral section of the compressor impeller, all of which are connected to the visualization unit of the processing results.