航空科学技术2024，Vol.35Issue(11)：41-50,10.DOI:10.19452/j.issn1007-5453.2024.11.006
基于混合RANS/LES方法的空腔流动仿真分析
Analysis on Cavity Flow Based on Hybrid RANS/LES Method
摘要
Abstract
During the flight,aircraft will generates severe cavity flow when opening the landing-gear bay or weapon bay,causing strong pressure pulsating and Aerodynamic noise.Therefore,it is of great significance to research and analyze the characteristics of unsteady flow.Based on hybrid RANS/LES computational fluid dynamics(CFD)simulation method,the M219 cavity test rig is taken as the research object.The unsteady flow of the cavity is studied and compared with the wind tunnel test results to verify the reliability of the hybrid RANS/LES method.First,patched grids strategy and grid sensitivity are analyzed in detail,so that the efficiency can be improved while ensuring the accuracy of calculation.Then the CFD result of the cavity unsteady flow is processed from different aspects to obtain the overall sound pressure level,the spectrum characteristics,the instantaneous and time-averaged flow structure in the cavity,which provides a basis for fully understanding the flow characteristics of the cavity and the mechanism of the high-intensity noise in the cavity.Finally,the influence of time step on the CFD results of cavity flow is also analyzed,which helps verifing the superiority and practicability of the hybrid RANS/LES simulation method,and improving the knowledge of its engineering applications.关键词
空腔流动/混合RANS/LES方法/搭接网格/网格敏感性/总声压级/频谱特性/PODKey words
cavity flow/hybrid RANS/LES method/patched grids/grid sensitivity/overall sound pressure level/spectral characteristics/POD引用本文复制引用
谢露,雷武涛,张昌九,廉佳,赵博文..基于混合RANS/LES方法的空腔流动仿真分析[J].航空科学技术,2024,35(11):41-50,10.基金项目
航空科学基金(2019ZA003002) Aeronautical Science Foundation of China(2019ZA003002) （2019ZA003002）
