入口雷诺数对静压油腔承载性能的影响

基于实验和数值模拟方法,研究了入口雷诺数为840~2 449时静压油腔的承载性能.利用PIV粒子测速系统实验研究了入口雷诺数变化对油腔内部流场结构的影响,与数值模拟结果吻合良好;数值模拟了不同入口雷诺数时油腔上壁面压强和壁面剪应力的变化.结果表明:随着入口雷诺数的增大,涡的位置逐渐靠近封油边,涡的范围逐渐变大;涡心位置与入口雷诺数有函数关系;入口喷射导致油腔上壁面中心处压强出现峰值,峰值之后的压强呈恒定分布;上壁面剪应力在上壁面正对入口边缘处出现峰值会导致油膜破裂.

Numerical Simulation of Carrying Capacity in Hydrostatic Oil Cavity Under Different Inlet Reynolds Numbers

Oil cavity’s carrying capacity under inlet Reynolds numbers in 840 ～ 2449 were investigated based on experiment and numerical simulation.The oil cavity flow fields under inlet Reynolds numbers observed by PIV meet well with numerical simulation results which cover oil cavity’s wall pressure and wall shearing stress.With the inlet Reynolds numbers increasing,the vortex position is near the oil sealing edge and the vortex becomes larger.There is a function relationship between vortex center position and inlet Reynolds numbers.A peak of wall pressure generated by inlet jet appears on the center of oil cavity’s upper wall,and then after the peak wall pressure distribute even as a constant.The peak of wall shearing stress at the edge of upper wall opposite to inlet may lead to the oil film rupture.