The purpose of this study is to develop a semi-analytic model for the prediction of broadband inflow noise of an airfoil in the frequency-domain, which can account for the effects of real airfoil geometry on the radiated sound pressure field in both phases of propagation and generation of aerodynamic sound. First, an acoustic transfer function is analytically derived to account for airfoil geometry’s effects in the propagation phase. The algebraic attenuation model is then combined to consider the effects of incident turbulence distortion in the generation phase. Predictions using the semi-analytic model provide much closer agreements with the measurements than the analytic model in a broader range of frequency and mean flow speed. Besides, the model is shown to reproduce a more realistic directivity of broadband inflow noise by including a drag-type loading source due to the finite thickness of an airfoil as well as a lift-type one.

这项研究的目的是建立一个半解析模型来预测机翼在频域中的宽带流入噪声，该模型可以解释真实机翼几何形状在传播的两个阶段对辐射声压场的影响。并产生空气动力声。首先，通过分析得出声学传递函数，以解释机翼几何形状在传播阶段的影响。然后将代数衰减模型组合起来，以考虑在生成阶段入射湍流畸变的影响。与半解析模型相比，在更宽的频率和平均流速范围内，使用半解析模型进行的预测与测量结果的一致性更高。除了，