摘要
采用计算流体力学(CFD)同"声类比"相结合的方法进行噪声模拟,利用CFD数值模拟MD30P30N多段翼型失速攻角附近流场以及其气动特性来校核近场精度,进一步通过结合可穿透数据面的FW-H声学方程进行气动噪声分析。为了准确捕捉近场流场信息,为噪声预测提供可靠的声源精度,本文基于k-ω剪应力输运(SST)湍流模型,建立了尺度适应分离流(SAS)模型,并采用γ-Reθt转捩模型耦合k-ωSST湍流模型建立了边界层转捩数值模拟技术;充分利用尺度适应模型在边界层表现为雷诺平均(RANS)方法这一特点,将γ-Reθt转捩模型与SAS模型结合,建立针对包含转捩、分离现象复杂流场的数值模拟技术。文中以RANS为控制方程,分别采用全湍流k-ωSST模型、γ-Reθt SAS转捩/分离流模型对多段翼进行近场数值模拟计算,结合可穿透数据面的FW-H声学方程进行气动噪声预测,在分析其对流场及气动噪声影响的基础上,得出了几点结论。
Combined the computational fluid dynamics （CFD） numerical simulation and the acoustics analogy method,the noise simulation on the multi-element airfoil of MD30P30N is presented. The CFD numerical simulation is used to compute the flow around MD30P30N multi-airfoil at the stall angle, and then the FW-H acoustics equation is combined to compute the aerodynamic noise. For giving the precise CFD result as the sound source,the scale-adaptive simulation of separate flow model which based on SST turbulent and the boundary transition simulation method which gives the coupling to γ- Reθt transition model and SST turbulent model are established. The scale-adaptive separate （SAS） flow model behaves the characters of the RANS method at the boundary layer. Based on the combination of the SAS model and the y- Reθt transition model, the numerical simulation technique including transition and separation for the complex flow is constructed. With the RANS equation as the control equation,the full turbulent simulation through the k-ω SSTmodel and the simulation through the γ-Reθt -SST-SAS transition model are used to compute the multi-element airfoil flow, respectively. The aerodynamic noise is computed through the FW-H equation based on the CFD solution. The results are analyzed at the aerodynamic view and the aerodynamic noise view, and several conclusions are given at the end of the paper.
出处
《计算力学学报》
CAS
CSCD
北大核心
2013年第5期704-711,共8页
Chinese Journal of Computational Mechanics
关键词
气动噪声
FW-H声学方程
γ-
Reθt转捩模型
尺度适应模型
转捩
分离流模型
aeroacoustic noise Ffowcs Williams-Hawkings equation γ- Reθt transition model scale-adaptive model
transition/separated flow mode
作者简介
王丹（1986-），女，博士生，（E—mail：wangdan_hong@163．com）．
