Analysis of Cavitation Characteristics of a Novel Low-speed High-torque Internal Curve Piston Pump
In order to investigate the internal basin cavitation characteristics of a novel low-speed high-torque internal curve piston pump,the internal drainage model of the fluid distribution of the internal curve piston pump is established.The cavitation distribution and generation in the fluid distribution basin are studied by CFD fluid simulation.The cavitation characteristics of the fluid distribution basin under different conditions are analyzed.The research findings demonstrate that cavitation mainly takes place at the oil discharge non-return valve port and the high-speed on-off valve port,and the gas phase volume fraction directly reflects the intensity of cavitation.Pump shaft speed and load pressure have an obvious effect on cavitation,however,too low oil suction pressure will cause the piston to suck air.The structure of fluid distribution internal basin is optimized by increasing the local inner diameter of the flow path and reducing the length of the flow path,thereby reducing the oil flow rate and weakening cavitation.The latter optimization method is superior to the former.
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