热科学学报（英文版）2005，Vol.14Issue(1)：22-27,6.
The Effect of Reflector with Sound-Absorbing Material on Supersonic Jet Noise
The Effect of Reflector with Sound-Absorbing Material on Supersonic Jet Noise
Y.-H. KWEON 1M. TSUCHIDA 1Y. MIYAZATO 1T. AOKI 1H.-D. KIM 2T. SETOGUCHI3
作者信息
- 1. Department of Energy and Environmental Engineering, Kyushu University, Kasuga 816-8580, Japan
- 2. School of Mechanical Engineering, Andong National University, Andong 760-749, Korea
- 3. Department of Mechanical Engineering, Saga University, Saga 840-8502, Japan
- 折叠
摘要
Abstract
This paper describes an experimental work to investigate the effect of a reflector on supersonic jet noise radiated from a convergent-divergent nozzle with a design Mach number 2.0. In the present study, a metal reflector and reflectors made of three different sound-absorbing materials (grass wool and polyurethane foam) were employed,and the reflector size was varied. Acoustic measurement is carried out to obtain the acoustic characteristics such as frequency, amplitude of screech tone and overall sound pressure level (OASPL). A high-quality schlieren optical system is used to visualize the detailed structure of supersonic jet. The results obtained show that the acoustic characteristics of supersonic jet noise are strongly dependent upon the jet pressure ratio and the reflector size. It is also found that the reflector with sound-absorbing material reduces the screech tone amplitude by about 5-13dB and the overall sound pressure levels by about 2-5dB, compared with those of the metal reflector.关键词
supersonic jet/supersonic jet noise/screech tone/OASPL/reflector/sound-absorbing materialKey words
supersonic jet/supersonic jet noise/screech tone/OASPL/reflector/sound-absorbing material分类
数理科学引用本文复制引用
Y.-H. KWEON,M. TSUCHIDA,Y. MIYAZATO,T. AOKI,H.-D. KIM,T. SETOGUCHI..The Effect of Reflector with Sound-Absorbing Material on Supersonic Jet Noise[J].热科学学报（英文版）,2005,14(1):22-27,6.
