Two-step simulation of slat noise

Two-step simulation of slat noise
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板条噪声的两步模拟

DOI:
10.1016/j.compfluid.2009.10.004
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发表时间:
2009
期刊:
影响因子:
2.8
通讯作者:
W. Schröder
W. Schröder
中科院分区:
工程技术3区
文献类型:
--
作者:
D. König;S. R. Koh;M. Meinke;W. Schröder

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采用混合方法对由缝翼和主翼组成的增升布局的流场和声场进行了数值研究。在第一步中,通过大涡模拟(LES)计算非定常流场,在第二步中,通过求解声学扰动方程(APE)确定声场。将平均流场与实验结果进行了比较,然后对湍流结构进行了研究,这些湍流结构由λ 2等值线可视化。声场分析表明,在主翼后缘产生约5kHz的声压波动。噪声源和声压之间的相关性确定的板条间隙区域负责1和3kHz之间的宽带和音调噪声的混合物。压力谱的衰减近似为f− 2,这与文献一致。
The flow field and the acoustic field of a high-lift configuration consisting of a slat and a main wing are numerically investigated by a hybrid method. In a first step, the unsteady flow field is computed via a large-eddy simulation (LES) and in a second step, the acoustic field is determined by solving the acoustic perturbation equations (APE). The mean flow field is compared to experimental findings followed by an investigation of the turbulent structures which are visualized by λ2contours. The analysis of the acoustic field shows that at the main wing trailing edge acoustic pressure fluctuations of approximately 5kHz are generated. Correlations between the noise sources and the acoustic pressure identify the slat-gap region to be responsible for the mixture of broadband and tonal noise between 1 and 3kHz. The decay of the pressure spectrum is found to be approximately f−2which is in agreement with the literature.
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