Analysis of Cavitation Characteristics in the Unloading Groove of a Piston Pump Considering Gas-liquid Coupling Effect
Aiming at the phenomenon that the piston pump is prone to cavitation during operation,the calculation equation of hydraulic oil viscosity is established.The effect of gas-liquid coupling is further increased under the premise of considering the viscosity-temperature characteristics.According to the structural characteristics of the piston pump,the simulation model of the internal fluid domain of the piston pump is established,and the accuracy of the model results is verified by the pressure characteristic test.Finally,the influence of the structural parameters of the triangular groove width angle and depth angle on the cavitation characteristics of the piston pump is explored.The results show that the comparison error between the simulation and the test on the outlet pressure is less than 4％,and the simulation model can better simulate the actual operation of the piston pump.The viscosity model considering the gas-liquid coupling effect has a viscosity decrease at inner and outer dead center of the valve plate.The increase of the width angle and depth angle of the triangular groove leads to the decrease of the gas volume fraction,which is beneficial to suppress the cavitation phenomenon,and the cavitation phenomenon at inner dead center is more serious than that at the outer dead center.
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