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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.
A mathematical model of the flow field in a sealed area is established for a high speed rotator flexible seal system. A modified Semi-Implicit Method for Pressure-Linked Equations Revised (SIMPLER) algorithm and finite Difference method is used to solve the mathematical model numerically. A flexible diaphragm sealing performance analysis program is constructed, and the pressure field distribution, velocity field distribution and leakage of the seal system are obtained. The influences of different structural parameters and working parameters on the sealing performance are also studied. The results show that the amount of leakage increases linearly with the increase of seal pressure, and decreases slightly with the increase of rotor speed. The width of the flexible sheet increases, the length of the flexible sheet decreases, the front / backplate-rotor spacing decreases It is beneficial to reduce the leakage of the sealing system, while the change of the installation angle of the flexible film has no obvious effect on the leakage of the sealing system. Based on the results of the flow field, the dynamic response of the flexible film and the rotor will be studied.