吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (8): 2385-2392.doi: 10.13229/j.cnki.jdxbgxb.20231300
程文1,2(),张成春2,3,4(),孙潇伟3,沈淳2,3,吴正阳1,2,陈正武1
Wen CHENG1,2(),Cheng-chun ZHANG2,3,4(),Xiao-wei SUN3,Chun SHEN2,3,Zheng-yang WU1,2,Zheng-wu CHEN1
摘要:
本文研究了NACA0012翼型在0°和10°攻角时不同来流速度下的声学性能,声学风洞试验显示,10°攻角时,翼型在30~60 m/s速度范围内产生明显单音噪声,其频率与Arbey声反馈模型预测结果接近。以有效降低单音噪声为导向,本文提出采用脊状结构打破声反馈回路的设想,并探讨脊状结构位置及排布形式对降噪性能的影响规律。结果表明:脊状结构越靠前,降噪效果越明显;随着速度的增加,靠后位置的脊状结构依次不再具有降噪效果。另外,单音噪声的产生只和压力面的流动状态有关,当压力面的流动状态被脊状结构打破后,便无法形成有效的反馈回路。最后,基于Arbey声学反馈理论,探讨了不同位置的脊状结构的降噪性能差异,发现当脊状结构位于叶片压力面最大速度点之前时,可以有效干预流场从而抑制单音噪声的产生。
中图分类号:
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