进口预旋对迷宫齿磨损形态下密封非定常气流激振转子动力特性系数的影响  

Effects of Inlet Preswirl on the Unsteady Flow Excitation Rotordynamic Characteristics of Labyrinth Seal with Tooth Wear

作　　者：陈尧兴 李志刚[2] 李军[2] 叶绿 CHEN Yaoxing;LI Zhigang;LI Jun;YE Lü(CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology,Nuclear Power Institute of China,Chengdu 610213,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xian 710049,China)

机构地区：[1]中国核动力研究设计院中核核反应堆热工水力技术重点实验室,成都610213 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《动力工程学报》2022年第3期221-228,共8页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51776152)。

摘　　要：为研究进口预旋对迷宫齿磨损形态下密封非定常气流激振转子动力特性系数的影响,采用基于转子多频椭圆涡动模型的URANS方程求解方法,计算分析了2种进口预旋比下未磨损结构、未弯曲磨损结构和部分弯曲磨损结构下密封泄漏质量流量、气流平均周向速度和转子动力特性系数的变化。结果表明:在2种进口预旋比下,增加磨损间隙和迷宫齿弯曲均会使密封泄漏质量流量增大;当进口预旋比为0时,密封泄漏质量流量增大使得转子周向拖动作用降低,腔室内气流平均周向速度减小,进而导致与转子涡动方向相反的负切向气流激振力减小,密封转子稳定性降低;当进口预旋比为0.45时,气流平均周向速度不受迷宫齿磨损结构的影响,因此迷宫齿磨损后腔室内周向动量增大,进而与转子涡动方向相同的正切向气流激振力增大,密封转子稳定性降低。In order to study the effects of inlet preswirl on the unsteady flow excitation rotordynamic characteristics of labyrinth seal with tooth wear,the unsteady Reynolds-averaged Navier-Stokes(URANS)solution based on multi-frequency elliptical orbit rotor whirling model was used to analyze variation of the seal leakage mass flow,average flow circumferential velocity and rotordynamic characteristic coefficient at two inlet preswirl ratios under the following circumstances,such as unworn structure,unbending wear structure and partial bending wear structure.Results show that at two inlet preswirl ratios,increasing the wear clearance and labyrinth tooth bending would increase the seal leakage mass flow.At the inlet preswirl ratio of 0,the increase of seal leakage mass flow would weaken the circumferential drag effect of the rotor,and thus the average flow circumferential velocity in the chamber decreases,which leads to the decrease of the negative tangential flow excitation force in the opposite direction of rotor whirl,and the stability of seal rotor decreases.At the inlet preswirl ratio of 0.45,the average flow circumferential velocity is not affected by the wear structure of labyrinth tooth.Therefore,the circumferential momentum in the chamber would increase after the wear of labyrinth tooth,the tangential flow excitation force in the same direction as the rotor whirl increases,and the stability of the seal rotor decreases.

关 键 词：迷宫齿 磨损 动力特性系数 气流激振力 数值模拟 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]