仿生多叶翼型槽干式气体端面密封的性能研究  

Performance Research on a Bionic Multi Wing-like Spiral Grooved Dry Gas Face Seal

作　　者：彭旭东[1] 呼延晨龙[1] 白少先[1] 李纪云[1] 盛颂恩[1] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310032

出　　处：《摩擦学学报》2013年第4期372-381,共10页Tribology

基　　金：国家自然科学基金项目(50805130;51175740);浙江省杰出青年基金项目(R1090833);教育部博士点基金项目(20103317110002)资助~~

摘　　要：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 problems that dry gas seal（DGS） open hard,and broken gas film stiffness or more leakage when it operated at high speed or pressure,this paper focused on improving seal reliability and service life of DGS.Based on design of DGS and bionic on birds,a new type of DGS was presented with multi-wing like spiral groove onto its faces（MW-DGS）.With the gas lubrication theory,geometric model of grooved face and the Reynolds equation for gas film pressure were set up.The sealing performance of MW-DGS and its derived types were studied by finite difference method.The results show,compared to DGS with typical spiral groove dry gas seal or double wing-like spiral groove,MW-DGS and derived types were good at excellent face opening behavior or operating stability at high speed,especially sealing abilities of derived types.Many suitable derived types were presented,and the main geometric parameters of biomorphic grooves were optimized.It demonstrates that bionic design was a new and advanced method,which provided foundation on the design of DGS at the extreme working conditions.Bionic design could broaden our thinking of DGS and other lubricated surface of moving parts.

关 键 词：干气密封 仿生设计 羽翼轮廓 密封性能 

分 类 号：TH117.2[机械工程—机械设计及理论]