干气密封系统角向摆动的稳定性及其振动响应  

Stability analysis and vibratory response of angular wobbly in the system of dry gas seal

作　　者：张伟政[1] 俞树荣[1] 丁雪兴[1,2] 韩明君[3] 杜兆年[2] 

机构地区：[1]兰州理工大学石油化工学院,兰州730050 [2]兰州理工大学温州泵阀工程研究院,温州325105 [3]兰州理工大学理学院,兰州730050

出　　处：《振动与冲击》2011年第3期96-99,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50965010);浙江省科技计划项目(2008C21131);高等学校博士学科点专项科研基金项目(20096201110001);温州市对外科技合作交流项目(H20080018)

摘　　要：干气密封系统角向摆动改变了动静密封环间的微尺度间隙,进而影响了干气密封的密封性能,建立了角向振动下气膜-密封环系统的动力学模型,应用微扰法和龙格-库塔法求解气膜角向刚度、临界转动惯量和角向摆动的二维振动方程,获得了密封系统稳定时的密封结构参数范围,并分析了最佳稳定点和临界点振动响应。研究结果表明:在特例中螺旋角α=75°邻域内,存在着稳定区域α=74°30'06″～75°16'10″,其最佳值为αopt=74°53'48″。最佳稳定点振动响应为准周期运动,而临界点振动响应发生了混沌运动。The angular wobbly of dry gas seal system changes the micro-scale gap between moving and static rings and influences the sealing performance,The dynamic model of the system of gas film and seal ring was established,and the angular rigidity of gas film,the critical moment of inertia as well as the two-dimensional angular wobbly vibration equation were solved by using the perturbation method and the Runge-Kutta method,then the stability parameters of seal structure were obtained,and the vibratory responses at the best stability point and critical point were analyzed.The results show that there are stability point-fields α=74°30′06″-75°16′10″ in the neighborhood of spiral angle α=75°,and the optimal value of spiral angle α is 74°53′48″ in the example.The vibratory response at the best stability point is quasi-periodic motion,but the response at critical point is chaotic motion.

关 键 词：干气密封 角向摆动 龙格-库塔法 稳定性 振动响应 

分 类 号：TH113.1[机械工程—机械设计及理论]