A spectral model for the sound pressure from turbulent premixed combustion
A spectral model for the sound pressure from turbulent premixed combustion
复制标题
湍流预混燃烧声压的频谱模型
DOI：
10.1016/j.proci.2006.07.154
复制
发表时间：
2007
影响因子：
2.4
通讯作者：
T. Sattelmayer
中科院分区：
文献类型：
--
作者：
C. Hirsch;J. Wäsle;A. Winkler;T. Sattelmayer
我们提出了紊流预混燃烧中热释放的光谱分布模型，并展示了如何将其应用于声压的计算。本文给出了三种热功率、三种等效比和不同燃料成分下的预混合旋流射流火焰的实验数据。采用PIV-LIF同步技术，确定了气流过程变量方差和湍流动能的空间谱。结果表明，过程变量的谱与均质湍流的模型谱吻合较好。将这些欧拉空间谱映射到拉格朗日时间谱，我们展示了如何使用时间平均热释放率密度、湍流动能和湍流长度尺度的局部值来计算热释放波动的积分频谱。利用这些方法计算了湍流预混燃烧声压的谱分布，并与实测声压谱进行了比较。在所有情况下都得到了很好的定量一致。
We present a model for the spectral distribution of heat release in turbulent premixed combustion and show how it can be applied to the calculation of sound pressure. Experimental data are presented from premixed swirling jet flames at three thermal powers, three equivalence ratios and for a variation of the fuel composition. A simultaneous PIV-LIF technique was used to determine the spatial spectra of the progress variable variance and turbulence kinetic energy. It was found that the spectra of progress variable correspond well with model spectra derived for homogeneous turbulence. Mapping these Eulerian spatial spectra to Lagrangian time spectra, we show how the integral frequency spectrum of heat release fluctuation can be computed using local values of time averaged heat release rate density, turbulence kinetic energy and turbulence lengthscale. With these the spectral distribution of sound pressure from turbulent premixed combustion is calculated and compared with measured sound pressure spectra. Very good quantitative agreement is obtained in all cases.