CAA Slat Noise Studies Applying Stochastic Sound Sources Based On Solenoidal Digital Filters
CAA Slat Noise Studies Applying Stochastic Sound Sources Based On Solenoidal Digital Filters
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应用基于螺线管数字滤波器的随机声源的 CAA 板条噪声研究
DOI：
10.2514/6.2005-2862
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
R. Ewert
中科院分区：
文献类型：
--
作者：
R. Ewert
本文研究了一种低成本的CAA方法在板条噪声问题中的应用。介绍了一种新的快速、廉价的模拟板湾非定常湍流声源的随机方法。它基于随机白噪声场的空间滤波，并结合了来自稳定RANS计算的关于积分长度尺度和湍流动能的信息。随机方法，源于Klein等人提出的LES流入边界条件。本文将其推广到气动声学应用中。推广的公式产生了一个完全的螺线速度场，它能够精确地再现均匀各向同性湍流的完整的二阶两点关联张量。文中给出了基于Menter SST湍流模型的RANS平均流场在板条上产生声的结果，其中Menter SST湍流模型进行了Kato-Lawder修正。模拟的湍流流场和辐射声场的结果显示出有物理意义的特征。
The present paper studies the application of a low-cost CAA approach to a slat noise problem. A new fast and cheap stochastic approach is introduced to model the unsteady turbulent sound sources in the slat-cove. It is based on the spatial filtering of a random white-noise field and incorporates information about the integral length scale and the turbulent kinetic energy from a steady RANS computation. The stochastic method, which stems from the LES inflow boundary condition proposed by Klein et al. that reproduces firstand second-order one-point statistics, is extended in this paper for aeroacoustic applications. The extended formulation yields a perfectly solenoidal velocity field that is capable to reproduce exactly the complete second-order two-point correlation tensor of homogeneous isotropic turbulence. Results for the sound generation at the slat are given for the underlying RANS mean-flow field being based on a Menter SST turbulence model with and without Kato-Launder modification, respectively. The results for the modeled turbulent flow-field and the radiated acoustic field exhibit physical meaningful characteristics.