• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Key Engineering Materials >A Study of Fault Mechanisms in a Rotor-Seal System
【24h】

A Study of Fault Mechanisms in a Rotor-Seal System

机译：转子密封系统的故障机理研究

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

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，该方法可用于分析三维转子密封系统中气体引起的振动的故障机理和流固耦合功能。在不借助线性简化的情况下，该方法的特征是密封装置流场的非线性空气动力的直接数值解。同时，不是通过预先假定转子振动为简单的谐波来进行解耦简化处理，而是为三维转子密封建立了流固耦合模型。结果，提出了一种分析方法，其通过考虑流固耦合效应来评估转子密封件的气流引起的振动问题。计算了速度，压力比和预旋转对气流引起的密封件振动的影响，然后将该影响与工程实践和测试结果进行了比较。在此基础上，验证了几种数值计算方法的可靠性。还已经确定了密封气体流动引起的振动的基本特征。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振幅。但是，始终存在转子一阶临界速度的频率分量。此外，分量的幅度将随着速度，气流入口压力和正向输入气体预旋转的增加而增加。已经发现上述情况与工程实践和测试结果中发现的密封气流引起的振动现象相当吻合。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号