On the Space-Time Correlation of Heat Release Rate in Turbulent Premixed Flames

On the Space-Time Correlation of Heat Release Rate in Turbulent Premixed Flames
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湍流预混火焰放热速率的时空相关性研究

DOI:
10.1080/00102202.2015.1085861
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发表时间:
2016
影响因子:
1.9
通讯作者:
Yang Liu
Yang Liu
中科院分区:
工程技术4区
文献类型:
--
作者:
Yang Liu

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燃烧噪声的光谱特征是由热释放率波动的时间相关性决定的。本文通过对近年来湍流预混火焰直接数值模拟数据的分析,探讨了放热率波动的两点时空相关性。结果表明,由于放热速率的突然波动,这种相关性在空间和时间上都迅速衰减。两点时空相关可以用高斯函数表示,其中包括有强对流的流向。观察到相关函数的频谱具有平坦的低频依赖性,这将允许在乘以ω2项(ω为角频率)时对燃烧噪声的谱峰和低频谱斜率进行建模。这项探索性工作显示了这种相关函数在捕获燃烧噪声的光谱形状方面的潜力。
ABSTRACT The spectral characteristics of combustion noise is dictated by the temporal correlation of the heat release rate fluctuation. This article investigates the two-point space-time correlation of heat release rate fluctuations by analyzing recent direct numerical simulation data of turbulent premixed flames. The results show that this correlation decays rapidly in both space and time due to the abrupt fluctuation of the heat release rate. The two-point space-time correlation can be modeled by Gaussian-type functions including the streamwise direction with strong convection. A flat low-frequency dependence is observed for the spectrum of the correlation function, which will allow the modeling of the spectral peak and the low-frequency spectral slope of combustion noise when multiplying the term ω2 (ω is the angular frequency). This exploratory work shows the potential of this correlation function for capturing the spectral shape of combustion noise.
勘误表:使用直接数值模拟测量静态预混 V 型火焰的几何特性和湍流火焰速度
DOI: 10.1007/s10494-010-9304-1
发表时间: 2010
期刊: Flow, Turbulence and Combustion
影响因子: --
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通讯作者: Dunstan T
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发表时间: 2011-12
期刊: Flow, Turbulence and Combustion
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发表时间: 2015
期刊: AIAA Journal
影响因子: 2.5
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发表时间: 2012
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