迷宫密封泄漏特性的试验研究  

Experiment on Leakage Flow Characteristics of Labyrinth Seal

作　　者：李志刚[1] 郎骥[1] 李军[1] 丰镇平[1] 

机构地区：[1]西安交通大学叶轮机械研究所,西安710049

出　　处：《西安交通大学学报》2011年第3期48-52,64,共6页Journal of Xi'an Jiaotong University

基　　金：新世纪优秀人才支持计划资助项目(NCET-07-0699);国家重点基础研究发展规划资助项目(2007CB210107)

摘　　要：为了研究迷宫密封泄漏特性,设计并搭建了旋转密封试验台,测量了典型迷宫密封在8种压比、5种转速、固定密封间隙下的泄漏量和密封腔室压力.通过数值模拟结果的对比分析,找出了压比、转速对迷宫密封泄漏特性和腔室压力的影响规律.研究结果表明:搭建的旋转密封试验台在迷宫密封泄漏量和密封腔室压力的测量精度上是可靠的;相比于试验结果,数值计算获得的泄漏量和腔室压力的最大相对误差分别为3.25%、3.6%,表明试验与数值结果吻合良好,数值方法可以较准确地预测迷宫密封的泄漏量和腔室压力;相同转速下的流量系数随着压比的提高而增大,小压比下的流量系数增加迅速;相同压比下的转速对流量系数的影响很小,可以忽略;迷宫密封腔室压力系数沿流动方向逐渐减小,密封腔室结构对压力系数影响很大.A rotating seal test rig with a data acquisition system was designed and established to investigate the leakage behavior of a typical labyrinth seal.The leakage and cavity pressure were measured for the labyrinth seal at eight pressure ratios,four rotational speeds,and a sealing gap.The effects of pressure ratio and rotational speed on the leakage behavior and cavity pressure of the labyrinth seal were examined by experiment and simulation.The results show that the maximum relative deviation of the leakage flow rate and cavity pressure predicted is 3.25% and 3.6%,respectively,compared with the experimental data.The flow coefficient increases with pressure ratio and is more sensitive to the smaller pressure ratio at the same rotational speed.The influence of rotational speed on the flow coefficient is very slight which might be neglected at the same pressure ratio.In addition,the cavity pressure coefficient decreases in the direction of flow and is significantly influenced by the cavity structure.

关 键 词：迷宫密封 泄漏特性 试验测量 数值模拟 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]