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Mathematical Problems in Engineering
Volume 2017 (2017), Article ID 3704324, 12 pages
https://doi.org/10.1155/2017/3704324
Research Article

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

1State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, China
2Shaanxi Key Laboratory for Environment and Control of Flight Vehicle, Xi’an Jiaotong University, Xi’an 710049, China
3China Aerodynamics Research and Development Center, Mianyang 621000, China

Correspondence should be addressed to Gang Chen

Received 14 March 2017; Revised 20 June 2017; Accepted 25 July 2017; Published 17 October 2017

Academic Editor: Maria Patrizia Pera

Copyright © 2017 FeiFei Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.