摘要
锯齿形喷嘴被认为是一种有效而实用的射流噪声被动控制方法。采用大涡模拟与FW-H方程(Ffowcs Williams and Hawkings Equation)相结合的方法预测圆形喷口和锯齿型喷口的流场和远场噪声。分析锯齿的分布方式以及结构参数对降噪特性的影响。结果表明,尾喷管的射流核心区域温度较高,湍动能值较小,整个核心区域呈现锥形。锯齿型喷口可以有效抑制低频段喷流噪声;仅在内涵添加锯齿结构的喷口降噪效果最好,可以降低整个频段的噪声;齿数增加与切入角变化对降噪效果有一定影响。
Sawtooth nozzle is considered as an effective and practical method for passive control of jet noise. In this work, the noises of circular nozzle and sawtooth nozzle in the flow field and far-field are predicted by combining large eddy simulation with FW-H equation. The effects of sawtooth distribution and structural parameters on the characteristics of jet noise reduction are analyzed. The results show that the temperature in jet core area is high, the turbulent kinetic energy is low, and the whole core region is conically shaped. The sawtooth nozzle can effectively suppress the low-frequency noise of jet noise. The noise reduction effect of the nozzle with sawtooth structure is the best, which can reduce the noise of the whole frequency band. The increase of tooth number and the change of cutting angle have a certain impact on the noise reduction effect.
作者
孙晨洋
王平
祁浩天
袁梦铖
SUN Chenyang;WANG Ping;QI Haotian;YUAN Mengcheng(Institute for Energy Sources,Jiangsu University,Zhenjiang 212000,Jiangsu,China)
出处
《噪声与振动控制》
CSCD
北大核心
2023年第1期154-158,209,共6页
Noise and Vibration Control
基金
国家自然科学基金资助项目(12102154,91741117)。
关键词
声学
涡扇发动机
双射流
锯齿型喷口
大涡模拟
噪声控制
acoustics
turbofan engine
dual-stream jet
sawtooth nozzle
large eddy simulation
noise control
