Adjoint - based Aeroacoustics Design Optimization for Blade Vortex Interaction Noise

摘要

This paper presents the development and application of an adjoint-based optimization method to designing airfoils with the objective of mitigating airfoil - vortex interaction noise without incurring severe performance penalties. The unsteady flow problem is simulated with an in-house two dimensional Euler finite volume solver. The acoustic analysis is performed using a two-dimensional formulation of the FW-H equation in the frequency domain. The corresponding adjoint codes that compute the sensitivities of the optimization objective functions with respect to the design variables are developed through linearization of each component of the aerodynamic and acoustic solvers respectively. The newly developed adjoint formulation is then used to perform airfoil design optimization on a NACA 0012 airfoil while constraining the time-integrated lift coefficient to the baseline value. Results are presented for different optimization algorithms.