Compressible Fluid Medium, Axial Piston Pump And Instantaneous Flow Simulation

This paper is one part of task- "Unconventional method research of controlling axial piston pump's noise"(N0.59675011), which is supported by Natural Science Foundation of China. Reduce distribution noise by reasonable valve plate design, and so reduce the noise of pump.The primary noise source of high pressure axial piston pump is the noise result from the process of oil distribution, which is called distribution noise. The four factors that influence distribution noise are: pressure pulsation, cavitation, the peak value of pressure gradient in the process of pre-compression or pre-decompression in the piston oil tank and the flow pulsation of the pump.Inevitably there is gas in the oil so in the paper the working medium is compressible fluid, the main behaving is that the elasticity module and density of the oil is the function of working pressure and gas including.Above all establishing the pressure differential equation in the piston oil tank's pre-compression and pre-decompression process of the axial piston pump building the working medium is compressible, then have simulation with the normal and the asymmetry valve plate, and concluding that asymmetry valve plate have some advantages than normal valve plate in preventing pressure pulsation and cavitation when using the most favorable oil rate.Last, get the impact factor of transient flow rate and the method to reduce it from the simulation of transient flow rate of the axial piston pump.Not only prevent the pressure pulsation and cavitation but also reduce the flow pulsation of the pump according to this paper's design principle, and the working medium is compressible fluid, so the research is more reasonable.