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利用计算流体力学软件Star-cd二次开发功能模拟了某一航空发动机滑片泵的内部流场,分析了计算中是否引入空化模型对计算结果的影响,以及滑片泵定子和滑片间隙大小对滑片泵性能的影响,预测了不同工况下,滑片泵内出现空化的位置和区域大小.计算结果表明:由于滑片泵叶片转动,从而引起空化区域范围的缩小和增大,泵油量也相应地增加和减小,使得滑片泵进口瞬时流量较为平稳,而出口瞬时流量有较大的脉动,进、出口周期平均流量与计算总平均流量的误差小于1.5%,计算总平均流量与该滑片泵样件的台架实验测试结果之间的误差小于3%;滑片泵转子叶片与定子壁面间隙增大,泄漏量增加,滑片泵的平均流量减小;间隙为0.07mm的滑片泵计算总平均流量相对于间隙为0.02mm的计算总平均流量减小3.1%.从计算结果可以推断,滑片泵的进口流道应与吸油腔正对,可以减少进口流道内空化区域和流动阻力.
The internal flow field of an aero -engine vane pump was simulated by using the secondary development function of computational fluid dynamics software Star-cd. The influence of the cavitation model on the calculation results and the vane pump stator and vane clearance The size of the vane pump performance prediction, prediction of the vane pump in different conditions, the cavitation position and the size of the region.The results show that: due to the vane pump blade rotation, causing cavitation area narrowed and increased The pump oil volume also increased and decreased correspondingly, making the instantaneous flow rate of the vane pump inlet relatively stable, while the instantaneous flow rate of the outlet had larger pulsation. The error between the average flow rate of the inlet and outlet cycles and the calculated average flow rate was less than 1.5% The error between the calculated average total flow rate and the bench test results of the vane pump sample is less than 3%; the clearance between the vane pump rotor blade and the stator wall surface increases, the leakage increases, and the average flow rate of the vane pump decreases; The calculated total average flow of the vane pump with gap of 0.07mm is reduced by 3.1% with respect to the calculated total average flow with the gap of 0.02mm. It can be inferred from the calculation results that the inlet passage of the vane pump should be directly opposite to the oil sucking chamber to reduce Enter Air flow path and flow resistance region.