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针对端柱面组合气膜密封系统建立稳态特性的分析模型,给出基于有限元数值方法求解气膜压力分布的数值模拟方法和流程,实现端面、柱面区域的耦合求解,进而给出了端柱面组合气膜密封系统稳态特性数值模拟计算的方法.通过与Fluent软件仿真结果的比较验证数值模拟方法的正确性.重点研究膜厚与旋转轴转速对端柱面组合气膜密封系统稳态特性(端面气膜反力、柱面气膜反力、泄漏量、摩擦转矩)的影响,计算分析表明:随着膜厚的增加,泄漏量增加、摩擦转矩减小;随着端面膜厚的增加,端面气膜反力缓慢减小、柱面气膜反力出现极值;随着柱面膜厚的增加,端面气膜反力和柱面气膜反力都在减小;柱面膜厚对稳态特性的影响大于端面膜厚.端柱面结构中密封气膜压力的耦合对密封特性影响显著,稳态特性数值模拟方法的实现为动态特性分析提供了基础.
Aiming at the analysis model of gas seal system with end cylinder and cylinder, the numerical simulation method and flow of gas pressure distribution based on finite element method are given, and the coupling of end surface and cylinder area is solved. The method of numerical simulation of the steady state characteristics of the end-cylinder combined gas-sealed system was verified by comparing with the simulation results of Fluent software to verify the correctness of the numerical simulation method. The steady state characteristics (the reaction force of the end surface membrane, the reaction force of the cylindrical membrane, the amount of leakage and the friction torque) are calculated. The calculated results show that as the membrane thickness increases, the leakage increases and the friction torque decreases. As the thickness of the end face increases, the reaction force of the end face air film slowly decreases, and the reaction force of the cylinder air film appears the extreme value. With the increase of the cylinder thickness, the reaction force of the end face air film and the cylindrical film reaction force decrease. The influence of cylinder thickness on the steady-state properties is greater than that of the end-face film, and the coupling of the seal-film pressure in the end-cylinder structure has a significant influence on the seal characteristics. The realization of the steady-state numerical simulation method provides the basis for the dynamic characteristics analysis.