A new aerodynamic noise model for aerodynamic optimization design

A rapid prediction method of the aerodynamic noise is developed, which can be applied to the aerodynamic optimization design of the wing or airfoil. The method uses Reynolds-averaged Navier-Stokes equation with a two-equation turbulence model to include the effects of the lift coefficient, flow three-dimensionality, and wing design parameters on the trailing-edge noise. These effects are not considered in the existing, semi-empirical noise prediction methods. While compared to DNS or acoustic analogy method, the proposed noise metric is not the exact value of noise intensity, but it is a relative noise measure suitable for design studies. The new noise model is less expensive to the full-noise calculations done with computational aerodynamic noise methods. The total sound pressure level(SPL) of the different wings or airfoils and the change of the total SPL with the lift coefficient can be obtained by this method. It can be easily applied to the airfoil/wing. The reliability of the method is validated by calculating and analyzing the noise difference caused by the change of the geometric parameters or the free-stream conditions and comparing the results with the results obtained by the ANOPP software and the Brooks. Finally, Two-dimensional airfoils and three-dimension wing were computed to display the values of the method.