| 凹凸板冲击射流噪声特性的实验研究 |
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| 引用本文： | 葛其明,姚朝晖,崔雨,何枫.凹凸板冲击射流噪声特性的实验研究[J].清华大学学报(自然科学版),2005,45(5):681-684. |
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| 作者姓名： | 葛其明 姚朝晖 崔雨 何枫 |
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| 作者单位： | 清华大学,工程力学系,北京,100084 |
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| 基金项目： | 国家自然科学基金资助项目(19902009) |
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| 摘 要： | 冲击射流噪声研究可为减轻垂直起降型飞机的声致疲劳提供思路。用快速Fourier变换得到了不同形状冲击面条件下冲击射流的远场噪声,并分析了噪声频谱。结果表明:对于凹、凸、平三种形状的冲击面,当冲击距离较小时,冲击单音主导了离散频率噪声;冲击单音最强音的频率随压比增大呈现频级阶越的现象;射流噪声总声压级随压比成类似对数增长的关系,当喷嘴压比大于2.5后,总声压级随压比的增长趋于缓慢;对于冲击面为凹面的冲击射流,远场噪声总声压级对喷嘴位置改变非常敏感。
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| 关 键 词： | 冲击射流 凹面 凸面 冲击单音 离散频率 总声压级 |
| 文章编号： | 1000-0054(2005)05-0681-04 |
| 修稿时间： | 2004年6月10日 |
Experimental investigation on noise characteristics of jets impinging on concave and convex plates |
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| GE Qiming,YAO Zhaohui,CUI Yu,HE Feng.Experimental investigation on noise characteristics of jets impinging on concave and convex plates[J].Journal of Tsinghua University(Science and Technology),2005,45(5):681-684. |
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| Authors: | GE Qiming YAO Zhaohui CUI Yu HE Feng |
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| Abstract: | The noise of impinging jets plays an important role in designs to reduce sonic fatigue in short take-off and vertical landing (STOVL) aircraft. Far-field noise characteristics of impinging jets on concave, convex, and plane plates were analyzed using fast Fourier transform. The results show that the impinging tone dominates the discrete frequency noise with short impinging distances. The frequency of the strongest impinging tone changes in discrete steps as the nozzle pressure ratio (NPR) increases. Far-field acoustic measurements indicate that the overall sound pressure levels (OASPL) logarithmically increase with the NPR which means that this increase is relatively insensitive to variations in the NPR for NPR larger than 2.5. For a jet impinging onto a concave plate, the OASPL of the far-field noise is quite sensitive to position variations of the nozzle. |
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| Keywords: | impinging jet concave plate convex plate impinging tone discrete frequency overall sound pressure levels |
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