Prediction of Noise Source for an Aeroengine Combustor
Prediction of Noise Source for an Aeroengine Combustor
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DOI：
10.2514/6.2011-2913
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
Y. Liu;A. Dowling;N. Swaminathan;T. Dunstan;R. Morvant;M. Macquisten;L. Caracciolo
中科院分区：
文献类型：
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作者：
Y. Liu;A. Dowling;N. Swaminathan;T. Dunstan;R. Morvant;M. Macquisten;L. Caracciolo
在贫燃燃气涡轮机燃烧室设计阶段，如果对燃烧噪声认识不足，燃烧噪声将成为一个重要的噪声源。本文针对以往研究中很少报道的真实的发动机燃烧室的燃烧噪声源和宽带谱进行了预测，并与某验证发动机的实测噪声数据进行了比较。通过对湍流DNS V型火焰研究结果的分析，建立了脉动放热率的时空关联模型，并应用RANS方法计算了航空发动机燃烧室流场。采用低阶线性网络模型对验证机燃烧室进行建模，得到了燃烧室放热和声脉动的传递函数。中低功率设置的初步结果表明，预测模型捕捉到的燃烧噪声的宽带频谱形状的主要特征，但低估了频谱水平。因此，在相关模型的经验长度和时间尺度，以获得良好的协议与测量的光谱水平。进一步的工作正在进行中，以改善预测燃烧噪声水平的模型。
Combustion noise may become an important noise source if not well understood in the design stage of lean burn gas turbine combustors. This work aims to predict the combustion noise source and broadband spectrum for a real aeroengine combustor, which has rarely been reported in past studies, and to compare with measured noise data on a demonstrator aeroengine. A spatial-temporal correlation model of fluctuating heat release rate is developed by analysing recent results of turbulent DNS V-flames, and the aeroengine combustor flow is calculated using RANS. A low-order linear network model is applied to the demonstrator aeroengine combustor to obtain the transfer function relating the heat release and acoustic fluctuations. The initial results for a low-medium power setting indicate that the prediction model captures the main characteristics of the broadband spectral shape of combustion noise but underestimates the spectral level. Empirical length and time scales in the correlation model are hence employed to obtain good agreement with the measured spectral level. Further work is underway to improve the model in predicting the combustion noise level.