高速气流阻塞效应对倾斜微孔端面密封动压特性的影响

发布时间：2018-08-20 08:59

【摘要】：以倾斜椭圆微孔端面为研究对象,考虑出口阻塞效应和入口压力损失,对高速气流润滑密封动压特性展开理论研究.采用数值方法重点分析不同密封压力、转速等操作参数和端面宽度等几何参数以及方向因子、倾斜角、孔深及面积比等微孔几何参数下,阻塞效应对开启力和泄漏量等密封特性参数的影响规律.结果表明:入口压力损失使入口处压力降低,出口阻塞效应使出口处压力抬升,导致端面开启力和泄漏量降低.随着转速和密封压力的增加,阻塞效应增强,与强制压力边界下的值相比,当密封压力为10 MPa,转速为50 000 r/min时,开启力降低可达5%以上,泄漏量可降低67%以上.当孔深取2~4μm,微孔倾斜角取20°~40°时较易获得优异的动压开启性能.
[Abstract]:Taking the end face of tilted elliptical microhole as the research object, the dynamic pressure characteristics of high-speed airflow lubricated seal are studied theoretically by considering the exit blocking effect and inlet pressure loss. The numerical method is used to analyze the geometric parameters such as different sealing pressure, rotational speed and end face width, as well as directional factors, inclination angle, hole depth and area ratio, etc. The effect of blocking effect on sealing characteristic parameters such as opening force and leakage rate. The results show that the inlet pressure is reduced by the loss of the inlet pressure, and the pressure at the outlet is raised by the blocking effect of the exit, which leads to the decrease of the opening force and leakage of the end face. With the increase of rotational speed and sealing pressure, the blocking effect is enhanced. When the sealing pressure is 10 MPA and the rotational speed is 50 000 r/min, the opening force can be reduced by more than 5% and the leakage volume can be reduced by more than 67% compared with the value at the forced pressure boundary. When the hole depth is 2 渭 m and the inclination angle is 20 掳~ 40 掳, it is easy to obtain excellent dynamic pressure opening performance.
【作者单位】：浙江工业大学机械工程学院;
【基金】：国家自然科学基金项目(51275473) 浙江省自然科学基金杰出青年基金项目(LR14E050001)资助~~
【分类号】：TH136

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