深槽表面气体静压润滑低Reynolds数层流节流效应实验研究

气体介质在润滑间隙流动过程中,沿气体流动方向开设的表面矩形深槽结构内部产生旋涡阻碍气体流动,形成节流效应.通过矩形深沟槽表面静压润滑实验,开展深槽表面和光滑表面的流量特性对比测试,研究了低Reynolds数层流状态下深槽表面间隙的气体节流效应.结果表明:深槽表面产生显著的节流效应,并且随Reynolds数增加而增强;在低Reynolds数层流状态下,深槽表面可以产生节流效应,但是节流效应强度不稳定,当处于完全湍流状态时,节流效应维持定值;间隙尺寸、槽深等结构参数对节流效应影响明显.

Experimental Study on Throttling Effect of Gas Hydrostatic Deep-Grooved Surfaces under Low Reynolds Number

The vortex generated inside deep grooves obstructs the flow when the gas flows through the clearance on step-deep grooved surfaces. This leads to the decreasing of the leakage rate called the throttling effect as a result. In order to investigate the throttling effect of the rectangular deep grooved surfaces with laminar flow under low Reynolds number, an experimental study on gas hydrostatic lubrication was carried out to compare the flux between the grooved surface and the smooth one. Experimental results show that there was significant throttling effect on deep grooved surfaces, which was enhanced with the increasing Reynolds number. There is also throttling effect under laminar flow which was unstable but kept constant under turbulent flow. The throttling effect depended on structural parameters of deep grooves (e.g. the clearance and grooved depth).