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为解决干式气体端面密封在中低速或启动停车阶段密封性能不稳定的问题,在现有螺旋槽端面型槽结构的基础上借鉴仿生学设计方法提出了仿生多流通道螺旋槽干气密封端面结构.基于气体润滑理论模型,采用数值分析方法计算了气体端面气膜压力控制方程-雷诺方程,研究对比了普通螺旋槽和多流通道槽的端面压力分布.在改变操作参数和端面气膜厚度的条件下分析对比了普通螺旋槽和多流通道槽两种干气密封的开启力,泄漏率,刚度和刚漏比的变化规律,并研究了槽的通道数对密封性能的影响规律.结果表明:中低速下多流通道细长螺旋槽具有高的稳定性和好的密封性,汇流槽在增加密封稳定性的同时可降低泄漏率.
In order to solve the problem that the sealing performance of dry gas end face seal is unstable during the low speed or start-stop phase, based on the existing spiral groove end face groove structure, the biomimetic design method is adopted to propose a bionic multi-channel spiral groove dry gas seal face Structure. Based on the gas lubrication theory model, the gas pressure control equation - Reynolds equation of the gas end face was calculated by numerical analysis. The end face pressure distribution of the common spiral groove and multi-flow channel groove was studied and compared. After changing the operating parameters and the end face gas film thickness The open-circuit force, leakage rate, stiffness and the ratio of leakage to leakage of two kinds of dry gas seals in common spiral groove and multi-flow groove were analyzed and compared, and the influence of the number of grooves on the sealing performance was studied.Results The results show that the slender spiral groove with multi-flow passage at medium and low speed has high stability and good sealing performance. The busbar can reduce the leakage rate while increasing the sealing stability.