基于CFD/CSD耦合的声气动弹性时域仿真  

AEROELASTIC-ACOUSTICS TIME DOMAIN SIMULATION BASE ON CFD/CSD COUPLING

作　　者：裴曦[1] 徐敏[1] 

机构地区：[1]西北工业大学航天学院,陕西西安710072

出　　处：《工程力学》2012年第9期380-384,共5页Engineering Mechanics

基　　金：国家自然科学基金重大研究计划项目(90816008);博士点基金项目(20070699054)

摘　　要：传统的声振环境,只考虑了给定声场环境下的结构响应分析,这个给定的声场孤立于结构本身,忽略了声场、结构、流体的耦合效应,因此声气动弹性耦合这种多力学场的研究具有重要意义。基于此,提出了一种基于CFD/CSD耦合的声气动弹性数值仿真策略,相比传统的声振环境预示方法,该方法考虑了声载荷(脉动压力场)与结构的耦合关系。该文首先采用有限体积法离散Euler方程,对二维的NACA0012翼型进行求解,来验证非定常气动力的准确性。然后通过CFD/CSD耦合计算三维AGARD445.6机翼的非定常气动力,在时域内推进结构运动方程,得到弹性响应的结构历程,记录每一时刻的气动载荷,并运用声气动弹性分析的思想对机翼表面的声压级进行计算,证实了声气动弹性分析方法的可行性。The analysis of structural responses was only considered in a fixed sound field in the prior work using the traditional computational method for acoustic vibration, and the couple effect between an acoustic field and structural displacements and a flow field was often neglected. It is indicated that coupling between a structure and its acoustic filed can be significant. In this paper, a new aeroelastic-acoustics is presented. The CFD simulation is based on a finite volume employing Euler equation in NACA0012. Unsteady pressures are computed The CFD/CSD coupling is used to predict the unsteady pressure of an AGARD445.6 wing, and the time domain numerical integration is then used to simulate the response of the structure as well as aerodynamic loading. The sound pressure level（SPL） on the structural surface is calculated from the root mean square（RMS） of the unsteady pressure.

关 键 词：声气动弹性 非定常气动力 CFD/CSD耦合 数据交换技术 声压级 

分 类 号：V211.47[航空宇航科学与技术—航空宇航推进理论与工程]