Analysis of cavitation characteristics of swash plate axial piston pump
Aiming at the cavitation phenomenon of swash plate axial piston pump,the whole basin model of swash plate axial piston pump was established.The distribution of cavitation characteristics in the whole watershed was studied by using computational fluid dynamics method,and the influence law of working parameters such as load pressure of oil drain port,cylinder speed and swash plate dip angle on the cavitation characteristics of the whole watershed was analyzed.The results indicate that cavitation mainly occurs in the oil suction port,valve plate and plunger chamber,and the cavitation increases with the increase of gas phase volume fraction.The load pressure of oil drain port increases from 10 MPa to 30 MPa,and the peak gas phase volume fraction of oil suction port,valve plate and plunger chamber increase from 6.28%to 6.68%,5.91%to 7.13%,10.03%to 11.23%respectively.The cylinder speed increases from 2 200 r/min to 3 000 r/min,and the peak gas phase volume fraction of oil suction port,valve plate and plunger chamber increase from 6.39%to 6.41%,6.26%to 10.54%,7.13%to 10.16%respectively.The swash plate dip angle increases from 3.64° to 5.64°,and the peak gas phase volume fraction of oil suction port,valve plate and plunger chamber decrease from 6.34%to 6.41%,14.7%to 13.9%,10.16%to 11.66%respectively.In practical design of the swash axial piston pump,it is preferable that the values of the exhaust port load pressure,cylinder block speed,and obliquity angle are lower within a reasonable range,and there exists an optimal interval for the value of the obliquity angle.
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