迷宫密封结构对泄漏量和轴系临界转速影响分析研究

通过数值方法对转子-轴承-密封系统动力学模型求解，对3种密封间隙、8种密封直径、8种压差、8种入口损失率和21种密封长度对泄漏量和临界转速的影响进行研究；通过密封结构对轴系临界转速影响规律进行研究，对比分析了有、无密封力作用下转子-轴承-密封系统对临界转速影响。研究结果表明：通过与DYNLAB程序、TASCFlow程序的结果对比分析，该数学模型能较好的模拟计算泄漏量和转子系统临界转速；通过泄漏量影响规律研究，得出泄漏量随着密封间隙、密封直径和密封长度得增大而增大，泄漏量随压差和入口损失率的增大而减小。通过对临界转速影响规律研究，得到考虑密封会提高临界转速，密封长度的变化对临界转速的影响最大、密封间隙的变化对临界转速影响最小。

Leakage and critical speed effect study in labyrinth seals structure

Dynamics model of rotor-bearing-seal system are solved by numerical methods. Leakage and critical speed effect of three kinds of seal gaps, eight kinds of seal diameter, eight kinds of pressure, eight inlet loss coefficients and twenty-one kinds seal length are studied in this paper. Through the study of labyrinth seal structure effect on critical speed, it compared the effect if there is labyrinth seal force. The results show that the method can accurately calculate labyrinth seal leakage and rotor system critical speed by compare DYNLAB program and TASCFlow program. By the leakage influence regularity study, it gets that leakage will increase with seal gap, seal diameter and seal length, and it get that leakage will decrease with pressure and inlet loss coefficients. By critical speed influence regularity study, it will increase the critical speed when the rotor system has labyrinth seal force. Labyrinth seal length has largest effect on critical speed, and labyrinth seal gap has smaller effect on critical speed than seal diameter.