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An investigation of tip force and heat generation characteristics of brush seals.

机译：刷密封件的尖端力和发热特性的研究。

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摘要

Brush seals recently find increasing use in turbomachinery due to their compliant nature and superior leakage performance over conventional labyrinth seals. Utilizing high temperature super-alloy fibers and their compliance capability, these seals maintain contact with the rotor for a wide range of operating conditions leaving minimal passage for parasitic leakage flow. Consequently, contact pressure generated at seal rotor interface is of importance for sustained seal performance and service life longevity. Furthermore, due to the contact forces at the interface, frictional heat generation is inevitable and must be evaluated for various design and operating conditions.; In this study, focus is directed frictional heat generation while emphasis is given to seal tip force calculations. Linear and nonlinear beam equations are expressed as a function of brush seal design and operating parameters and then solved. The results from two approaches were compared. An empirical model, which includes interbristle friction effect, has been developed for tip forces under various operating conditions based on linear beam theory and utilizing numerous test results. In addition, effect of pressure differential on seal tip forces is also studied.; The friction coefficient of material pair is measured under different loading and sliding speeds.; Temperature distribution on rotor due to frictional heat generation at seal-rotor interface is measured utilizing infrared thermography. To verify the heat generation model, a finite element model is developed and temperature distribution on the rotor is compared to temperature distribution from testing.
机译：相比于传统的迷宫式密封件，电刷密封件的顺应性和出色的泄漏性能最近在涡轮机械中得到越来越多的使用。这些密封件利用高温超级合金纤维及其顺应能力，可在广泛的运行条件下保持与转子的接触，从而使寄生泄漏流的通孔最少。因此，在密封件转子界面处产生的接触压力对于持续的密封性能和使用寿命很重要。此外，由于在界面处的接触力，摩擦热的产生是不可避免的，必须针对各种设计和操作条件进行评估。在这项研究中，重点是摩擦热的产生，而重点是密封尖端力的计算。将线性和非线性梁方程表达为电刷密封设计和运行参数的函数，然后求解。比较了两种方法的结果。基于线性梁理论并利用大量测试结果，针对各种工作条件下的尖端力，建立了包括刷毛间摩擦效应的经验模型。另外，还研究了压差对密封尖端力的影响。在不同的载荷和滑动速度下测量材料对的摩擦系数。利用红外热像仪测量由于密封件-转子界面处产生的摩擦热而导致的转子温度分布。为了验证热量产生模型，开发了有限元模型，并将转子上的温度分布与测试中的温度分布进行了比较。

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  • 作者

    Demiroglu, Mehmet.;

  • 作者单位

    Rensselaer Polytechnic Institute.;

  • 授予单位 Rensselaer Polytechnic Institute.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 127 p.
  • 总页数 127
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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