Sound Generation by Turbulent Non-premixed Flames
Sound Generation by Turbulent Non-premixed Flames
复制标题
湍流非预混火焰产生声音
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
Kok
中科院分区：
文献类型：
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作者：
Sikke A. Klein;Jim B.W;Kok
摘要 预测了在远场测量的湍流非预混火焰的声谱。假设无限快的化学反应，得出声谱的封闭形式描述。然后，声谱可以用火焰前锋处混合物部分的 ID 湍流谱来描述。该湍流谱的输入值源自稳态 CFD 火焰计算。声谱模型的预测与在声学一维燃烧室中进行的实验进行比较。测量和预测之间的比较对于混合燃烧方法有效的火焰很有好处。对于燃烧速度受到化学动力学限制的火焰，测量的光谱显示比预测的光谱更陡峭的下降
Abstract The sound spectrum from a turbulent non-premixed flame as measured in the far field is predicted. A closed form description for the sound spectrum is derived assuming infinitely fast chemistry. The sound spectrum can then be described in terms of the ID turbulent spectrum of the mixture fraction at the flame front. The input values for this turbulent spectrum are derived from a steady state CFD flame calculation. The predictions from the sound spectrum model are compared widi experiments performed in an acoustically one-dimensional combustion chamber. The comparison between measurements and prediction is good for flames in which the mixed-is-burnt approach is valid. For flames, whose burning velocity is limited by chemical kinetics the measured spectrum shows a steeper fall off than the spectrum from the predictions