| 低速开式空腔自激反馈流场结构与流致噪声的风洞试验研究 |
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| 引用本文： | 梁勇,陈迎春,赵鲲,王勇,岳廷瑞,陈正武.低速开式空腔自激反馈流场结构与流致噪声的风洞试验研究[J].声学学报,2020,45(6):859-868. |
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| 作者姓名： | 梁勇 陈迎春 赵鲲 王勇 岳廷瑞 陈正武 |
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| 作者单位： | 西北工业大学航空学院 西安710072;中国空气动力研究与发展中心 绵阳 621000;中国商用飞机有限责任公司 上海201200;中国空气动力研究与发展中心 绵阳 621000 |
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| 基金项目： | 国家重点研发计划项目(2017YFE0012330)和国家自然科学基金项目(11602290)资助 |
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| 摘 要： | 本文主要针对低速开式空腔流动自激振荡产生噪声问题,在0.55 m×0.4 m航空声学风洞开展了不同低马赫数(0.1/0.15/0.2/0.25)条件下长深比为2的空腔腔内流场结构和噪声特性风洞试验研究。通过利用高频粒子图像测速技术捕捉腔内流场结构,分析了腔内声波传递路径;完成空腔远场噪声和壁面压力测试,分析了噪声自激振荡模态和简正波模态,并对空腔壁面脉动压力和远场噪声进行压/声相关性研究。结果表明:空腔内部除主涡外,在腔口前缘处剪切涡与腔口后缘处碰撞涡明显存在;在875 Hz,1288 Hz,1875 Hz,2050 Hz四个频率附近出现了由声腔共振所致的单频噪声;壁面压力与远场噪声密切相关,在壁面压力主频位置有明显单频噪声出现。
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| 收稿时间： | 2019-05-14 |
Wind tunnel experimental study of self oscillation feedback flow field structure and flow induced aeroacoustic for open cavity at low speed |
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| Affiliation: | 1 School of Aeronautics, Northuestern Polytechrnical University Xi'an 710072;2 China Aerodgramics Research and Deuelopment Center Mianyang 621000;3 Commercial Aireruft Corporation of China, Ltd. Shanghai 201200 |
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| Abstract: | Regarding the noise problem caused by open-cavity self oscillation,an experiment of flow over a rectangular cavity with a length-to-depth ratio of 2 at Mach 0.1,0.15,0.2,0.25 was conducted in the 0.55 m×0.4 m aero-acoustic wind tunnel.In this research,the velocity field and self-oscillation aeroacoustic formation mechanism was studied.High frequency Particle Image Velocimetry was employed to observe the flow field structure,the path of acoustic wave and pressure wave was analyzed.The acoustic self-sustaining oscillation modes and duct modes were investigated by testing the far sound field and the fluctuating wall pressure.Moreover,the characteristics of the correlation between the wall pressure and the acoustic performance were discussed.The results showed that apart from the main vortical structure,there are the shear vortex at the leading edge and the crash vortex at the trailing edge.Also,around the frequencies of 875 Hz,1,288 Hz,1,875 Hz and 2,050 Hz,there exists an obvious tonal noise,induced by the cavity oscillation.In addition,it was found that the wall pressure is highly correlated with the far field noise,and the tones appear at the same frequencies where the peaks show up in the wall pressure spectra. |
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