| 赵忠,高永卫.两种鼻锥在高速气流中声学特性的研究[J].声学技术,2007,(1):96~100 |
| 两种鼻锥在高速气流中声学特性的研究 |
| Experimental study of flow-induced tones of nose cones in high-speed flows |
| 投稿时间：2005-04-18 修订日期：2005-08-02 |
| DOI： |
| 中文关键词: 气动声学 高速气流 传感器自噪声 鼻锥 风洞实验 |
| 英文关键词: aero-acoustics experiment high-speed flow flow-induced tones nose cone wind tunnel |
| 基金项目:西北工业大学“英才计划”项目 |
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| 中文摘要: |
| 为了在气流当中进行噪声测量,传声器上必须加装适当形式的鼻锥以降低传感器自噪声。否则,传感器自噪声会过大而影响正常的声学测量。所以,当在高速气流中进行声学测量时,传感器自噪声成为测量的制约因素。如何降低传感器自噪声成为高速气流中声学测量的关键。鼻锥的形式对传感器自噪声有重要的影响。为了发展低噪声鼻锥,采用实验的方法,在闭口风洞声学实验段中,研究了两种形式鼻锥在风速为10m/s～50m/s时的声学特性。实验结果表明,半球型头部的鼻锥在风速为30m/s～50m/s时比常见的鼻锥自噪声小约3～11(dB)。因此,使用半球型头部的鼻锥可以改善测试条件或提高实验风速。 |
| 英文摘要: |
| Flow-induced tones will be generated in the case where the microphone mounted in high-speed flow.The SPL(Sound Pressure Lever) of flow-induced tones limits the required flow speed of aero-acoustic experiment.A nose cone,which plays an important role,must be jacketed the microphone for reducing flow-induced tones.In order to reduce SPL of flow-induced tones as much as possible,an experiment was conducted to investigate the characteristics of flow-induced tones of two different nose cones.The two nose cones,one is usual nose cone having a taper head and the other is one having hemisphere head with screen covered,were tested in NF-3 wind tunnel of North-Western Politechnical University,and the test section is octal with 2.2m wide every side.When the flow speed are 10m/s and 20m/s,the SPL and power-spectrum of flow-induced tones of the two nose cones are similar.When the speed reaches 30m/s、40m/s and 50m/s,their power-spectrum are still similar,but the nose cone with hemisphere head and screen,comparing with the usual one,can reduce the SPL of flow-induced tones by 3~11(dB).The results show that the nose cone with hemisphere head and screen is better than the usual one in aero-acoustic experiment when the sensor mounted in high-speed flow. |
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