摘要
本文实验研究亚音速圆口喷流噪声的一种被动控制方法。将喷管内壁改造成多孔板与后方容腔组合的结构,研究这种被动措施对声源流场与辐射声场的影响。设计制作了多种"多孔内壁+空腔的组合延伸构件,与不包括这种多孔处理的基础喷管相比较,在喷流出口马赫数同为Ma=0.5的情况下,分析了这些"多孔内壁+空腔"延伸构件的孔径D、孔深H以及空腔厚度T对喷流远声场的影响与变化趋势,为采用这种方法控制喷流噪声的实际应用提供了初步的依据。
In this paper, a passive method for attenuation of subsonic round jets is explored experimentally. The inner wall of the nozzle is modified to be a perforated wall with a chamber in behind, so as to study the effects of this modification on the jet noise. Cylindrical extensions each of them has a perforated wall and a chamber in behind are designed and attached to a convergent nozzle. For comparison, the nozzle has a smooth extension is also included as the baseline case. The sound radiation of the jets from both the porous and baseline nozzles at Ma=0.5 is experimentally studied. The effects of the diameter D, and the depth H, of the perforated holes, and the thickness T, of the chamber, on the noises in far field are analyzed. This study has provided some preliminary suggestions for applications of noise attenuation by using the structures with perforated inner wall and chamber in behind.
作者
施智晓
许聪
赖焕新
SHI Zhi-Xiao;XU Cong;LAI Huan-Xin(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第3期559-564,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.51576067)
关键词
亚音速喷流
壁面多孔化
气动噪声
噪声控制
subsonic jet
perforated wall and chamber
aeroacoutic noises
noise attenuation
