Algorithm for the Nonlinear Propagation of Broadband Jet Noise

Algorithm for the Nonlinear Propagation of Broadband Jet Noise
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宽带射流噪声非线性传播算法

DOI：
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发表时间：
2009
期刊：
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通讯作者：
K. Viswanathan
K. Viswanathan
中科院分区：
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文献类型：
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作者：
Swati Saxena;P. Morris;K. Viswanathan

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DOI：10.2514/1.38122提出了一种非线性噪声传播的频域算法。超高速射流产生的噪声传播呈现出非线性效应。这种非线性行为，包括能量向高频的转移，在本算法中被捕捉到。对于压力信号，在频域内求解了包含大气吸收和大气耗散的广义非线性Burgers方程。然后得到作为时间函数的结果。给出了一个正弦波的算例，并与现有的解析Blackstock桥函数和Fubini解进行了比较。将正弦wavecaseagreefairlywellwiththeanalyticalresults.JetnoisedatafromtheBoeingLowSpeedAeroacousticFacility的预测结果用于宽带噪声预测。比较了不同径向位置传声器的实验功率谱密度图和预测功率谱密度图。计算结果与实验结果吻合较好，功率谱密度图显示了由于波的非线性陡化而产生的高频提升力。实验信号和预测信号的偏度分别是discussedfortheBoeingdata.Full-scaledataacquiredduringatie-downtestoftheF/A-18Earepropagatedusingthe非线性预测和线性预测，并讨论了结果的差异。然后给出了波音和F/A-18E发动机数据的地面反射效应。
DOI: 10.2514/1.38122 A frequency-domain algorithm for nonlinear noise propagation is presented. The propagation of noise generated by very high-speed jets exhibits nonlinear effects. This nonlinear behavior, which includes the transfer of energy to high frequencies, is captured in the present algorithm. The generalized nonlinear Burgers equation, which includes atmospheric absorption and dissipation, is solved for the pressure signal in the frequency domain. The results are then obtained as a function of time. A test case of a sinusoidal wave is considered, and the results are compared with the existing analytical Blackstock Bridging Function and Fubini solutions. The predicted results of the sinusoidal wavecaseagreefairlywellwiththeanalyticalresults.JetnoisedatafromtheBoeingLowSpeedAeroacousticFacility are used for the broadband noise prediction. The experimental and predicted power spectral density plots are compared for microphones at different radial locations. The predicted results are in good agreement with the experimental results at all the microphone locations, and the power spectral density plots show a lift at high frequencies due to the nonlinear steepening of the waves. The skewness of the experimental and predicted signal is discussedfortheBoeingdata.Full-scaledataacquiredduringatie-downtestoftheF/A-18Earepropagatedusingthe nonlinear and linear predictions, and the differences in the results are discussed. Ground reflection effects are then presented for both the Boeing and F/A-18E engine data.