Numerical Investigation on Vortex-Structure Interaction Generating Aerodynamic Noises for Rod-Airfoil Models

Abstract EN

In past several decades, vortex-structure interaction generated aerodynamic noise became one of the main concerns in aircraft design.

In order to understand the mechanism, the acoustic analogy method combined with the RANS-based nonlinear acoustics solver (NLAS) is investigated.

The numerical method is firstly evaluated by the experiment data of the classic rod-airfoil model.

Compared with the traditional analogy methods, the RANS/NLAS can capture the nonlinear aerodynamic noise more accurately with lower gird requirements.

Then different rod-airfoil configurations were simulated to investigate the aeroacoustic interaction effects.

The numerical results are in good agreement with those of the earlier experimental research.

It is found that the vortex-shedding crash to the airfoil is the main reason for the noise generation which is dependent on the configurations, distance, and flow conditions.