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为有效解决干式气体端面密封(简称干气密封)在低速、低压等操作条件下端面开启困难、稳定性差以及在高速、高压等高操作参数工况下泄漏率较高的瓶颈问题,提高密封的可靠性及使用寿命,在现有干气密封型槽设计方法的基础上,根据鸟类仿生学原理,提出了仿生多叶翼型槽干气密封.基于气体润滑理论,建立了仿生多叶翼型槽干气密封及其几种衍生型式的端面几何结构模型和气膜压力控制非模型,采用有限差分法进行数值模拟,分析了仿生多叶翼型槽及其衍生型槽的特殊几何结构与几何参数对干气密封性能的影响规律.结果表明:相较于单向螺旋槽干气密封和普通单向仿生双叶翼型槽,仿生多叶翼型槽及其衍生型槽干气密封在端面开启能力及运行稳定性上都有明显提升,而且仿生多叶翼型槽的衍生型式干气密封其泄漏率保持不变甚至更低.文中提出了仿生多叶翼型槽干气密封的合适衍生型式,给出了相应型槽主要几何参数的优化取值范围.该研究进一步验证了干气密封仿生型槽的设计理念,为极端工况下干气密封的端面型槽设计提供了仿生学依据,拓宽了干气密封及其他润滑部件表面设计的研究思路.
In order to effectively solve the bottleneck problem of dry gas end face seal (referred to as dry gas seal) open end difficult, poor stability and high leakage rate under high speed, high pressure and other operating conditions under low speed and low pressure operating conditions, improve the sealing Based on the existing design method of dry gas sealed groove, according to the bionics principle of the birds, the dry gas seal of the bionic multi-blade airfoil trough is proposed.Based on the gas lubrication theory, the bionic multi-leaf Airfoil dry gas seal and its derivative geometry model and gas pressure control model are used to do numerical simulation with finite difference method. The special geometric structure of the bionic wing and its derivative groove Geometry parameters on the dry gas sealing performance.The results show that compared with the unidirectional spiral groove dry gas sealing and the common unidirectional bionic double wing blade, the bionic multi-blade wing groove and its derivative groove dry gas sealing The openability of the end face and the stability of the operation are obviously improved, and the leakage rate of the derivative type dry gas seal of the bionic multi-wing airfoil tank remains the same or even lower. The appropriate derivation type of dry gas seal is given and the optimal range of the main geometrical parameters of the corresponding groove is given.This study further validates the design concept of dry gas sealed bionic tank for the dry gas sealed end face under extreme conditions Groove design provides a bionic basis to broaden the dry gas seal and other lubrication components of the surface design of research ideas.