| The Effect of Spherical Surface on Noise Suppression of a Supersonic Jet |
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| 引用本文： | Md.TawhidulIslamKhan,KunisatoSeto,ZhixiangXu,H.Ohta. The Effect of Spherical Surface on Noise Suppression of a Supersonic Jet[J]. 热科学学报(英文版), 2003, 12(2): 144-150. DOI: 10.1007/s11630-003-0056-2 |
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| 作者姓名： | Md.TawhidulIslamKhan KunisatoSeto ZhixiangXu H.Ohta |
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| 作者单位： | Graduate School，Saga University，Saga 840-8502，Japan，Department of Mechanical Engineering，Saga University，Saga 840-8502，Japan，Department of Mechanical Engineering，Saga University，Saga 840-8502，Japan，Department of Mechanical Engineering，National Fishery University，Shimonoseki，Japan |
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| 摘 要： | Experiments were carried out to eliminate the screech tone generated from a supersonic jet. Compressed air was passed through a circular convergent nozzle preceded by a straight tube of same diameter. In order to reduce the jet screech a spherical reflector was used and placed at the nozzle exit. The placement of the spherical reflector at the nozzle exit controlled the location of the image source as well as minimized the sound pressure at the nozzle exit. The weak sound pressure did not excite the unstable disturbance at the exit. Thus the loop of the feedback mechanism could not be accomplished and the jet screech was eliminated. The technique of screech reduction with a flat plate was also examined and compared with the present method. A good and effective performance in canceling the screech component by the new method was found by the investigation. Experimental results indicate that the new system suppresses not only the screech tones but also the broadband noise components and reduces the overal
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| 关 键 词： | 不完全扩张超音速喷流 球形反射器 降噪技术 流体力学 冲击波 |
The effect of spherical surface on noise suppression of a supersonic jet |
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| Tawhidul Islam Khan,Kunisato Seto,Zhixiang Xu,H. Ohta. The effect of spherical surface on noise suppression of a supersonic jet[J]. Journal of Thermal Science, 2003, 12(2): 144-150. DOI: 10.1007/s11630-003-0056-2 |
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| Authors: | Tawhidul Islam Khan Kunisato Seto Zhixiang Xu H. Ohta |
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| Affiliation: | (1) Graduate School, Saga University, 840-8502 Saga, Japan;(2) Department of Mechanical Engineering, Saga University, 840-8502 Saga, Japan;(3) Department of Mechanical Engineering, National Fishery University, Shimonoseki, Japan |
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| Abstract: | Experiments were carried out to eliminate the screech tone generated from a supersonic jet. Compressed air was passed through a circular convergent nozzle preceded by a straight tube of same diameter. In order to reduce the jet screech a spherical reflector was used and placed at the nozzle exit. The placement of the spherical reflector at the nozzle exit controlled the location of the image source as well as minimized the sound pressure at the nozzle exit. The weak sound pressure did not excite the unstable disturbance at the exit. Thus the loop of the feedback mechanism could not be accomplished and the jet screech was eliminated. The technique of screech reduction with a flat plate was also examined and compared with the present method. A good and effective performance in canceling the screech component by the new method was found by the investigation. Experimental results indicate that the new system suppresses not only the screech tones but also the broadband noise components and reduces the overall noise of the jet flow. The spherical reflector was found very effective in reducing overall sound pressure level in the upstream region of the nozzle compared to a flat plate. The proposed spherical reflector can, accordingly, protect the upstream noise propagation. |
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| Keywords: | under-expanded supersonic jet jet screech spherical reflector noise reduction. |
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