柔片式密封数值计算及性能分析

针对高速转子柔片式密封系统,建立了密封区域流场的数学模型,采用一种修正的压力耦合方程组的半隐式方法(Semi-Implicit Method for Pressure-Linked Equations Revised, SIMPLER)算法和有限差分法对数学模型进行数值求解,构建了柔片式密封性能分析程序,得到密封系统的压力场分布、速度场分布及泄漏量等,研究了不同结构参数和工况参数对密封性能的影响.分析结果表明:泄漏量随密封压差的增大呈线性增长趋势,而随转子转速的增大略有减小;增加柔片宽度、减小柔片长度、减小前/背板-转子间距均对降低密封系统的泄漏量有益,而柔片安装角度的变化则对密封系统的泄漏量影响不明显.基于流场的结果,柔片和转子的动力学响应将被研究. 

Numerical simulation and performance analysis of leaf seal

In order to obtain the result of pressure and velocity distribution and leakage of the leaf seal system which is applied to high-speed rotor, a mathematical model of sealing zone flow field calculated numerically with SIMPLER method and finite difference method was established. A software based on the algorithm referred was also designed specially for the performance analysis of leaf seal system. The influence of different structure parameters and working conditions on the system's performance was discussed. Analysis result shows that the leakage increases linearly with the sealing pressure and decreases slightly with the increase of rotor speed. Increasing width, reducing spacing between front/back cover plate to rotor and decreasing length are beneficial in decreasing the leakage of the system. While changing installation angle direction of the leaf has little influence on leakage. Research on dynamic response between leaf and rotor will be carried out based on the results of the flow field.