摘要
通过实验方法对阻塞喷注的噪声进行了研究。为了能模拟动态条件下的喷流声,在实验中采用了振荡喷管,分别测量了自由喷流、喷管-哈特曼头系统以及喷管-小圆板系统的声压谱。实验结果证实,振荡不改变阻塞喷注噪声的基本特性,但在某些条件下能增强或抑制声辐射。
This paper describes the study of jet noise generated from the vibrati onal choking nozzle through experimental method.In order to simulate the noise i n active condition,the vibrational jet nozzle is used.It can vibrate in the poin ted frequency to imitate the actual jet engine.The sound spectra of the free jet ,choking nozzle-Hartmann system and choking nozzle-little round plate system are recorded.It is demonstrated that the vibration of the choking nozzle can not ch ange the essencial character of the jet noise from choking nozzle.But in some co nditions,the vibration may increase or decrease the sound radiation.
出处
《空气动力学学报》
CSCD
北大核心
2003年第1期114-119,共6页
Acta Aerodynamica Sinica
关键词
收缩喷管
振荡
反馈
choking nozzle
vibration
feedback
