航空燃油柱塞泵滑靴副瞬态润滑建模方法研究OA

The lubrication performance of the slipper pair in aviation fuel piston pumps under extreme operating conditions such as high temperature,high pressure,high rotational speed and low-viscosity medium directly affects the service life and reliability of the pump.We investigate the mixed hydrostatic-hydrodynamic lubrication mechanism to reduce frictional losses.A transient lubrication model based on the hydrodynamic effect is proposed.We derive an asymmetric oil-film thickness expression,and solve the Reynolds equation and dynamic force-balance equations using finite volume and Newton-Raphson methods.This approach reconstructs oil film squeeze and tilt behaviors.We analyze the effects of pressure and rotational speed on film thickness,the maximum value of oil film pressure and frictional power loss.The results show that the squeeze effect dominates in the discharge-oil region,and the hydrodynamic effect dominates in the low-pressure region.In the transition region,film thickness and the degree of overturning are minimal.Meanwhile,significant pressure fluctuation occurs,with the pressure peak reaching 19.5 MPa.Rotational speed has the most significant impact on power loss.Increasing speed from 1500 r/min to 3500 r/min raises peak power loss by 50.4 W.Consequently,high rotational speed primarily causes aggravated slipper overturning and reduced mechanical efficiency.