基于CFD内流耦合仿真的燃油柱塞泵滑靴副动态润滑特性研究

To solve the dynamic lubrication problem of adaptive fuel film inside slipper pair of aero-engine fuel piston pump, a calculation model of slipper pair overturning was established. The model was based on Newton-Laphson algorithm, which in consideration of the coupling relationship between film hydrodynamic bearing and dynamic state of slipper. On this basis, the integrated simulation study on slipper pair and the front parts of a certain aviation piston pump was developed. Considering the influence of the flow inside the front part on the oil film characteristics, a simulation method combining CFD internal flow analysis with Reynolds lubrication model was used in the study. The simulation results show that the CFD simulation results agree with the experimental results, and the error is 4.3%. When the rotational speed increases from 4kr/min to 5kr/min, the maximum overturning value of film thickness decreases to 27.15% of the original value, and the maximum increase rate of the thickness change rate in the low pressure region reaches 62.02%. When the increase rate of outlet pressure is 66.7%, the fluctuation amplitude of film thickness change rate in the whole cycle increased to varying degrees. In the rotation period, the slipper achieve adaptive lubrication effect through the coupling change of film thickness and pressure field, which cause an adaptive dynamic pressure bearing.