This research presents theoretical analysis and numerical simulation of combined valvesââ?¬â?¢ dynamic\ncharacteristics in reciprocating oilââ?¬â??gas multiphase pump. Based on the mathematical model describing\nvalvesââ?¬â?¢ motion, a geometric model of pump cavity and combined valves is put forward for\nnumerical simulation in multiphase pump. The simulation is conducted by computational fluid\ndynamics (CFD) method with its dynamic grid technique. The motion process of suction valve\nand discharge valve are obtained on the basis of boundary conditions and optimized numerical\napproaches. And the effects of gas volume fraction (0.1âË?¼0.9), suction pressure (0.20âË?¼0.40 MPa)\nand discharge pressure (1.0âË?¼3.0 MPa) on valvesââ?¬â?¢ motion are reported. The results of pressure distribution,\nand valvesââ?¬â?¢ lift and velocity show that valve platesmaycling or rebound and then vibrate after\nreaching the lift limiter, and the lag angle of one cycle remains 3Ã?° under different working conditions.\nThe study could lay theoretical foundation for the design of new type of multiphase pump.
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