热科学学报（英文版）2008，Vol.17Issue(3)：224-227,4.
Jet Screech Reduction with Perforated Flat Reflector
Jet Screech Reduction with Perforated Flat Reflector
1
作者信息
- 1. Department of Mechanical Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan.
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摘要
Abstract
In the present experimental study, investigations have been carried out to evaluate the performance of the new control technique of jet screech with different perforated flat reflectors. Mainly two types of porous flat reflectors had been used in the experiment. One reflector (reflector-V) designed for placing the reflector surface vertical to the jet axis, when, another type of reflector (reflector-H) designed for placing the reflecting surface horizontal to the jet axis. In both cases the reflectors had been placed at the nozzle (base tube with uniform cross-sectional area)exit. The diameter of the reflector-V was 15D when the diameter of the reflector-H was 10D. The porous area of the reflector-V was 6D and 4.5D for reflector-H where D indicated the diameter of the nozzle exit. The placement of the reflector at the exit of the nozzle reduces the sound pressure at the nozzle exit. Thus the muted sound can not excite the unstable disturbance at the nozzle exit and the loop of the feedback mechanism disappeared, finally,the generation of jet screech be cancelled. The suction space located at the back side of the porous surface of the reflector-V improves the efficiency of the screech control technique. However, in the case of reflector-H, the receptivity process of feedback loop had been controlled by reducing the disturbances at the effective shock fronts as well as at the nozzle exit. The performance of the proposed method was verified with a flat reflector concept and good performance in jet screech suppression has been confirmed in the case of porous reflector.关键词
Supersonic jet noise/screech tone/feedback loop/noise reduction/porous reflectorKey words
Supersonic jet noise/screech tone/feedback loop/noise reduction/porous reflector分类
数理科学引用本文复制引用
..Jet Screech Reduction with Perforated Flat Reflector[J].热科学学报（英文版）,2008,17(3):224-227,4.
