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A Study of Fault Mechanisms in a Rotor-Seal System

机译：转子密封系统中的故障机制研究

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A numerical method is described, which can be used for analyzing the fault mechanisms and the fluid-solid coupling function of gas flow-induced vibrations in a three-dimensional rotor seal system. Without resorting to a linear simplification the method features a direct numerical solution of the nonlinear aerodynamic force of a seal device flow field. Meanwhile, instead of conducting a decoupling simplification treatment by assuming beforehand a rotor vibration to be a simple harmonic one, a fluid-solid coupling model has been set up for a three-dimensional rotor seal. As a result, an analytical method is brought forth, which evaluates the gas flow-induced vibration problem of a rotor seal by taking into account the fluid-solid coupling effect. The influence of speed, pressure ratio and pre-rotation on the gas flow-induced vibrations of the seal was calculated followed by a comparison of this influence with that found in engineering practice and test results. On this basis, the reliability of several numerical calculation methods was verified. The basic characteristics of the seal gas flow-induced vibrations have also been identified. With respect to different speeds, pressure ratios and pre-rotations there are different amplitudes for each individual frequency component of a rotor vibration. However, there is always a frequency component of rotor first-order critical speed. Furthermore, the amplitude of the component will increase with the increase in speed, gas-flow inlet pressure and the positive-direction incoming gas pre-rotation. The above circumstance has been found to be in fairly good agreement with the phenomenon of seal gas flow-induced vibrations found in engineering practice and test results.
机译：描述了一种数值方法，其可用于分析三维转子密封系统中气体流动诱导的气体流动振动的故障机构和流体固体耦合功能。不借助线性简化，该方法具有密封装置流场的非线性空气动力的直接数值解。同时，通过预先假设转子振动是简单的谐波振动，而不是进行解耦简化处理，已经为三维转子密封设置了流体固耦合模型。结果，提出了一种分析方法，其通过考虑流体固体耦合效果来评估转子密封的气体流动诱导的振动问题。计算速度，压力比和预旋转对密封件的气体流动诱导的振动的影响，然后比较了这种影响与工程实践和测试结果中的影响。在此基础上，验证了若干数值计算方法的可靠性。还鉴定了密封气体流动诱导的振动的基本特征。关于不同的速度，压力比和预旋转对于转子振动的每个单独的频率分量存在不同的幅度。然而，总是存在转子一阶临界速度的频率分量。此外，随着速度，气流入口压力和正向进入气体预旋转的增加，部件的幅度将增加。上述情况已经发现与在工程实践和测试结果中发现的密封气体流动诱导的振动的现象相当愉快。

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