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Effects of different heat source distribution on a Rijke tube

机译:热源分布对Rijke管的影响

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摘要

Power combustion systems have the potential for thermoacoustic instabilities, with many possible detrimental results. The present study experimentally investigates effects of the distribution of various heat sources on a Rijke tube. An electrical heater was designed to realize different tangential distributions of heat release by changing the spacing of the heating element. The experimental results showed that an optimum spacing exists to minimize the starting power of thermoacoustic oscillation and growth rate, and to maximize FFT amplitude. The oscillation frequency changed slightly with a different tangential distribution of heat release for different air flows. Numerical simulation was performed using the CFD method to obtain temperature and flow field distribution of the Rijke tube with different spacing of the heating element. The numerical results showed that a large high temperature and high speed region, forming immediately and simultaneously behind the heater, are conducive to thermoacoustic oscillation. (C) 2018 Elsevier Ltd. All rights reserved.
机译:动力燃烧系统可能会导致热声不稳定,并可能产生许多有害的结果。本研究通过实验研究了Rijke管上各种热源分布的影响。电加热器被设计为通过改变加热元件的间距来实现放热的不同切向分布。实验结果表明,存在一个最佳间隔,可以最大程度地减小热声振荡的起始功率和增长率,并最大化FFT幅度。对于不同的空气流,振荡频率会随着热量释放的切向分布的不同而略有变化。使用CFD方法进行了数值模拟,以得到加热元件间距不同的Rijke管的温度和流场分布。数值结果表明,在加热器后立即同时形成的较大的高温和高速区域,有利于热声振荡。 (C)2018 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Applied Acoustics》 |2019年第3期|66-75|共10页
  • 作者单位

    Beihang Univ, Sch Astronaut, Beijing 100191, Peoples R China;

    Beihang Univ, Sch Instrumentat & Optoelect Engn, Beijing 100191, Peoples R China;

    Beihang Univ, Beijing Adv Innovat Ctr Big Data Based Precis Med, Beijing 100191, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thermoacoustic oscillations; Rijke tube; Heat source distribution;

    机译:热声振荡里克管热源分布;

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