螺旋槽结构参数对干气密封动态特性的影响研究

发布时间：2019-06-26 16:01

【摘要】：基于气体润滑理论,并通过小扰动法建立了螺旋槽干气密封微扰膜压控制方程,在高速高压条件下分析了螺旋槽结构参数对气膜动态特性系数的影响规律;基于动力学相关知识,在考虑动环轴向振动和角向偏摆的情况下建立了挠性安装静环运动方程,分析了膜厚的扰动行为,同时在考虑轴向和角向气膜扰动的共同作用下,提出以端面膜厚最大扰动量峰值和扰动稳定时间作为表征密封动态追随性的参数,并以此作为目标函数对螺旋槽结构参数进行优化.结果表明:在不同的高压条件下,当槽台宽比κ取0.9~1.5,槽坝比δ取1.8~2.4,螺旋角φ取18~24°,槽深h_g取6~8μm时,螺旋槽干气密封具有较好的动态追随性;在动态特性系数中主动态刚度对密封动态追随性的影响最大.
[Abstract]:Based on the theory of gas lubrication, a perturbation membrane pressure control equation of the spiral groove dry gas seal is established by means of a small perturbation method, the influence of the structure parameters of the spiral groove on the dynamic characteristic coefficient of the gas film is analyzed under the high-speed high-pressure condition, in that case of considering the axial vibration and the angular deflection of the moving ring, the motion equation of the flexible mount static ring is established, the disturbance behavior of the film thickness is analyzed, The peak value and the disturbance stability time of the end face mask are used as the parameters for characterizing the dynamic following property of the seal, and the structure parameters of the spiral groove are optimized as a function of the objective function. The results show that, under different high-pressure conditions, when the aspect ratio of the groove is 0.9-1.5, the ratio of the groove to the dam is 1.8-2.4, the angle of the spiral angle is 18-24 degrees, and the depth h _ g of the groove is 6-8. m The main dynamic stiffness in the dynamic characteristic coefficient is the most important to the dynamic follow-up of the seal.
【作者单位】：浙江工业大学机械工程学院;浙江工业大学过程装备及其再制造教育部工程研究中心;
【基金】：国家自然科学基金面上项目(51575490,51175470) 国家重点基础研究发展规划项目(973)(2014CB046404) 浙江省自然科学基金重点项目(LZ15E050002)资助~~
【分类号】：TH136

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