The effect of wavy leading edges on aerofoil-gust interaction noise
The effect of wavy leading edges on aerofoil-gust interaction noise
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DOI：
10.1016/j.jsv.2013.06.031
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发表时间：
2013-11-25
影响因子：
4.7
通讯作者：
Kim, Jae Wook
中科院分区：
文献类型：
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作者：
Lau, Alex S. H.;Haeri, Sina;Kim, Jae Wook
采用高精度数值模拟方法研究了波浪前缘对翼型-阵风干扰噪声的影响。目前的研究是基于主要在流向和垂直方向上的周期性速度扰动，这是翼型表面压力波动的主要原因。总体而言，目前的结果表明，白噪声导致了AGI噪声的降低。结果表明，波状前沿峰峰幅度(LEA)与入射阵风的纵向波长之比(λ(G))是降低AGI噪声的最重要因素。观察到AGI噪声随LEA/lambda(G)的增大而增大的趋势，且当LEA/lambda(G)>；=0.3时，降噪效果显著。目前的结果还表明，任何两个具有相同LEA/lambda(G)的不同情况下，相对于直线前沿情况，它们的降噪曲线具有很强的相似性。然而，在当前阵风廓线下，波前缘波长(LEW)对降低AGI噪声的影响很小。然而，目前的结果表明，当1.0时，在降噪方面可能实现有意义的改进
High-order accurate numerical simulations are performed to investigate the effects of wavy leading edges (WLEs) on aerofoil-gust interaction (AGI) noise. The present study is based on periodic velocity disturbances predominantly in streamwise and vertical directions that are mainly responsible for the surface pressure fluctuation of an aerofoil. In general, the present results show that WLEs lead to reduced AGI noise. It is found that the ratio of the wavy leading-edge peak-to-peak amplitude (LEA) to the longitudinal wavelength of the incident gust (lambda(g)) is the most important factor for the reduction of AGI noise. It is observed that there exists a tendency that the reduction of AGI noise increases with LEA/lambda(g) and the noise reduction is significant for LEA/lambda(g)>= 0.3. The present results also suggest that any two different cases with the same LEA/lambda(g) lead to a strong similarity in their profiles of noise reduction relative to the straight leading-edge case. The wavelength of wavy leading edges (LEW), however, shows minor influence on the reduction of AGI noise under the present gust profiles used. Nevertheless, the present results show that a meaningful improvement in noise reduction may be achieved when 1.0