Noise Prediction for Multi-Element Airfoil Based on FW-H Equation
In this article, four observation points are selected in the flow field when predicting aerodynamic noise of a multi-element airfoil for both a coarser grid and a finer grid. Numerical simulation of N-S equations is employed to obtain near-field acoustic information, then far-field acoustic information is obtained through acoustic analogy theory combined with FW-H equation. Computation indicates: the codes calculate the flow field in good agreement with the experimental data; The finer the grid is, the more stable the calculated sound pressure level (SPL) is and the more regularly d(SPL)/d(St) varies.
J. Tao et al., "Noise Prediction for Multi-Element Airfoil Based on FW-H Equation", Applied Mechanics and Materials, Vols. 52-54, pp. 1388-1393, 2011