Analysis of Measured Flame Transfer Functions With Locally Resolved Density Fluctuation and OH-Chemiluminescence Data
Analysis of Measured Flame Transfer Functions With Locally Resolved Density Fluctuation and OH-Chemiluminescence Data
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利用局部分辨密度涨落和 OH 化学发光数据分析测量的火焰传递函数
DOI：
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发表时间：
2015
期刊：
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通讯作者：
T. Sattelmayer
中科院分区：
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作者：
Johannes Peterleithner;Nicolai V. Stadlmair;J. Woisetschläger;T. Sattelmayer
本文的研究目标是用一种基于视距OH*化学发光和密度波动数据相结合的新方法来分析火焰传递函数。OH*化学发光用光电倍增管和强化照相机获得，密度波动用激光测振仪在两轴导线上测量。在有强迫的火焰中，由于声波动与激励装置无关，因此可以通过判别燃烧噪声的所有贡献从数据中提取声波动。假设激发产生的波动具有旋转对称性，从测量的视距积分信号中获得平面相位分辨和伪局部OH*化学发光和密度波动数据。在研究中，该技术被应用于旋涡燃烧器配置的FTFs从已知的多麦克风测量（MMM）。第一步研究了无等比波动的外预混模式，第二步将燃料注入旋流器产生等比波动。在选定的频率下，将OH*化学发光的平面场和密度波动与FTFs进行比较，以提高对具体幅度和相位值的理解。除热释放外，测振仪的数据还揭示了充满热产物的燃烧室中冷反应物的锥形环形射流的周期性振荡。在全球尺度上，预混合情况下，两种方法都能令人满意地再现预期从MMM中释放的热量的振幅和相位，而如果存在等效比波动，则OH*-化学发光数据不能用作热量释放的指标，因为由于OH*对当地燃料-空气混合物的敏感性，FTF的振幅被明显高估。ASME版权所有©2015
The goal of the study presented in this paper is to analyze flame transfer functions with a new approach based on the combination of-line-of sight OH*-chemiluminescence and density fluctuation data. The OH*-chemiluminescence is acquired with a photomultiplier and an intensified camera, the density fluctuations are measured with a Laser vibrometer on a two axis traverse. In flames with forcing the acoustic fluctuations can be extracted from the data by discrimination of all contributions from combustion noise, because it is not correlated with the excitation device. Assuming rotational symmetry of the fluctuations originating from excitation, planar phase-resolved and pseudo-local OH*-chemiluminescence and density fluctuation data is obtained from the measured line-of-sight integrated signals.In the study this technique is applied to a swirl burner configuration with FTFs from known multi-microphone measurements (MMM). In the first step, the externally premixed mode without equivalence ratio fluctuations is studied and in the second step the fuel is injected in the swirler in order to generate equivalence ratio waves. At selected frequencies the planar fields of the OH*-chemiluminescence and density fluctuations are compared to the FTFs in order to improve the understanding regarding the specific amplitude and phase values. In addition to heat release the vibrometer data reveals the periodic oscillation of the conical annular jet of the cold reactants in the combustor filled with hot products. On the global scale the amplitudes and phases of heat release expected from the MMM are satisfactorily reproduced by both methods for the premixed cases, whereas OH*-chemiluminescence data cannot be used as indicator for heat release if equivalence ratio fluctuations are present, because the amplitude of the FTF is significantly over-predicted due to the sensitivity of OH* on the local fuel-air mixture.Copyright © 2015 by ASME