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首页> 外文会议>Proceedings of the ASME power conference 2009 >CHARACTERIZATION OF COMBUSTION DYNAMICS IN SWIRL STABILIZED FLAMES
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CHARACTERIZATION OF COMBUSTION DYNAMICS IN SWIRL STABILIZED FLAMES

机译：旋流稳定火焰的燃烧动力学特征

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摘要

This paper investigates flame frequency response relative to changes in swirl intensity and equivalence ratio in a non-premixed swirl stabilized burner. The degree of swirl in the burner is characterized by the swirl number (S) provided by circumferentially distributed air supply ports directed tangentially to the main axial air flow. Equivalence ratio variations are induced using varying constant, linear ramp and exponentially decaying fuel (propane) flow rates towards blowoff. The variations in the air speed at the exit of the burner (U) are measured with an anemometer located at the base of the flame. The emission of CH* radicals (/) is used as a marker of flame heat release and is measured using a photomultiplier (PMT). The frequency response of the PMT heat release and burner velocity signals are analyzed in the frequency domain using the Fast Fourier Transform (FFT) and Continuous Wavelet Transform (CWT) methods. Amplification in the power of heat release fluctuation is observed in low swirl flames close to blowoff. This effect is found to be reversed in higher swirl number flames even close to blowoff. In dynamic approaches to blowoff (using ramp and decaying fuel flow rates), the dominant heat release fluctuation frequencies are observed to be similar to perturbation frequencies in lean flames hovering at constant fuel flow rates close to blowoff.
机译：本文研究了非预混涡流稳定燃烧器中火焰频率相对于涡流强度和当量比变化的响应。燃烧器中的涡流度的特征在于，涡流数（S）由切向指向主轴向气流的周向分布的空气供应端口提供。使用变化的恒定，线性斜率和朝着排放的指数递减的燃料（丙烷）流量，可以引起当量比变化。燃烧器（U）出口处的空气速度变化是通过位于火焰底部的风速计测量的。 CH *自由基（/）的发射用作火焰放热的标志，并使用光电倍增管（PMT）进行测量。使用快速傅里叶变换（FFT）和连续小波变换（CWT）方法在频域中分析了PMT放热和燃烧器速度信号的频率响应。在接近爆燃的低涡流火焰中观察到了放热波动功率的放大。发现在接近旋流的较高旋流数火焰中，这种作用会逆转。在动态排放方法中（使用斜率和递减的燃料流量），观察到主要的热释放波动频率类似于以接近排放的恒定燃料流量盘旋的稀薄火焰中的扰动频率。

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  • 来源
  • 会议地点 Albuquerque NM(US);Albuquerque NM(US)
  • 作者

    Uyi Idahosa; Abhishek Saha; Chengying Xu; Saptarshi Basu;

  • 作者单位

    Mechanical, Materials and Aerospace Engineering Department University of Central Florida, Orlando, FL 32816;

    Mechanical, Materials and Aerospace Engineering Department University of Central Florida, Orlando, FL 32816;

    Mechanical, Materials and Aerospace Engineering Department University of Central Florida, Orlando, FL 32816;

    Mechanical, Materials and Aerospace Engineering Department University of Central Florida, Orlando, FL 32816;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 输配电工程、电力网及电力系统;
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