超高速干气密封微织构气膜润滑特性研究OA北大核心CSTPCD

In response to the problems of ultra-high speed,high-pressure operation,dry gas seal stability of equipment in the aerospace field,based on the optimized design of groove texture,a dry gas seal structure with micro-textured spiral groove at the bottom of the groove was proposed to solve the problem of the stability of the gas film in the process of ultra-high-speed rotation of the seal.Based on the theory of gas lubrication,a model was built,mesh division was carried out,and then imported into Fluent to simulate the flow field;after changing the working condition parameters and the parameters of the groove structure,compared with the ordinary spiral groove under the high pressure and ultra-high speed conditions,the dynamic pressure effect of spiral groove dry gas seal with micro-texture at groove bottom was significantly improved.The results show that when the groove depth hg=6 μm,film thickness h0=2 μm,microtextured groove depth δ =2 μm,microtextured groove width 3.97 mm,and microtextured groove is located in the middle of the bottom of the spiral groove,the microtextured spiral groove at the bottom of the groove can produce a significant dynamic pressure effect compared with the ordinary spiral groove.