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考虑入口气流压力损失和出口阻塞效应,建立了微间隙端面高速气体润滑密封分析数学模型,对螺旋槽端面微间隙高速气流润滑密封特性进行研究.重点分析了不同密封间隙、密封压力和转速等工况条件下,入口压力损失和出口阻塞效应对开启力、泄漏率及气膜刚度等密封特性参数的影响规律.结果表明:高速气体阻塞效应使出口压力高于环境压力,压力损失使入口气膜压力下降,导致泄漏率和气膜刚度明显下降,并使开启力增加.随着密封压力和密封间隙的增加,阻塞效应增强,导致泄漏率和气膜刚度显著降低.密封压力10 MPa时,泄漏率降低可达20%,气膜刚度的下降可达30%以上.
Taking into account the pressure loss of the inlet airflow and the outlet blockage effect, a mathematic model of high speed gas lubrication and sealing analysis on the micro-gap end face was established to study the lubrication characteristics of micro-gap high-speed gas flow lubrication at the end faces of the spiral groove. The analysis of different sealing clearances, The results show that the outlet pressure is higher than the ambient pressure due to the high-speed gas blocking effect, and the pressure loss causes the inlet gas film The decrease of pressure leads to a significant decrease of leakage rate and film stiffness, and an increase of opening force. With the increase of sealing pressure and sealing clearance, the blocking effect increases, resulting in a significant decrease of leakage rate and gas film stiffness. Up to 20%, the decline of gas film stiffness up to 30%.