机翼后缘噪声预测研究

机翼后缘噪声是飞机重要的机体噪声源之一。本文基于CFD(Computational Fluid Dynamic)数值模拟和Ffcows Williams-Hall理论,研究应用了一种预测干净机翼后缘气动噪声的方法。采用Menter’s SSTκ-ω湍流模型对翼型和机翼进行N-S方程数值模拟得到后缘附近的湍流特征速度和特征长度,再利用Serhat Hosder的预估方法计算后缘噪声强度级。本文首先计算了NACA0012翼型在7种不同状态的后缘噪声,计算结果与实验值比较,符合很好,从而证明了本文采用的方法的可行性和正确性;然后研究了两个亚音速翼型(NACA 0009,NACA 0012),两个超临界翼型(SC(2)- 0710,SC(2)-0714),EET机翼的不同参数对后缘噪声强度级的影响,得出了对降低后缘噪声有参考意义的结论。

Prediction of trailing edge noise of a clean wing

Trailing edge noise of a clean wing is one of the important airframe noise sources.This paper includes a theoretical trailing edge noise prediction and utilizes RANS code with Menter’s SSTκ-ωturbulence model to obtain the characteristic ve- locity and length scales.The characteristic velocity and length scales obtained from the CFD (Computational Fluid Dynamic) results are used in the noise model.The acoustic results are compared with experimental data and the results of Ref.5],and show reason- able good agreements.The effect of the wing geometry,airfoil trailig edge shape and the lift coefficient on the trailing edge noise are investigated.