新型浮动式收敛袋型密封自适应同心性能数值与实验研究

Numerical and experimental study on adaptive concentric performance of a new type of floating convergent pocket seal

提出了新型浮动式收敛袋型密封结构,建立了新型收敛袋型密封数值求解模型,研究新型收敛袋型密封周向压力分布规律,分析进出口压比和偏心率对新型收敛袋型密封泄漏量及浮动同心力的影响。设计搭建了浮动式自同心密封实验台,在数值计算结果与实验测试结果相互验证的基础上,研究进出口压比和偏心率对新型浮动式收敛袋型密封泄漏量及自适应同心性能的影响。研究结果表明:在本文研究工况下,新型收敛袋型密封所产生的浮动同心力是传统迷宫密封的8.9~10.9倍。在不同进出口压比和偏心率下,传统浮动式迷宫密封均始终处于初始偏心位置,自适应同心性能较差。新型浮动式收敛袋型密封均向转子轴心方向移动,且随着进出口压比和偏心率的增大,浮动响应时间缩短,自适应同心性能增强。新型浮动式收敛袋型密封具有良好的浮动响应特性和自适应同心性能。

A new type of floating convergent pocket seal structure is proposed,a numerical solution model of new convergent pocket seal is established,the distribution law of circumferential pressure of new convergent pocket seal is studied,and the influence of import/export pressure ratio and eccentricity on the leakage and floating concentric force of new convergent pocket seal are analyzed.The experimental platform of floating self-concentric seal is designed and constructed.On the basis of the mutual verification of the numerical calculation results and the experimental test results,the influence of import/export pressure ratio and eccentricity on the leakage and adaptive concentric performance of the new floating convergent pocket seal was studied.The results show that,under the working conditions,the floating concentric force of the new convergent pocket seal is 8.9-10.9times that of the traditional labyrinth seal.Under different import/export pressure ratios and eccentricities,the traditional floating labyrinth seal is always in the initial eccentric position and the adaptive concentric performance is poor.The new floating convergent pocket seal moves in the rotor axis direction,with the increase of import/export pressure ratio and eccentricity,the floating response time is shortened and the adaptive concentric performance is enhanced.The new type of floating convergent pocket seal has good floating response characteristics and adaptive concentric performance.