摘要
运用声学传感器和频谱仪对一台小型高速低噪声离心风机进行试验研究,研究发现:风机进出口向外辐射的气动噪声为风机最主要的噪声类型,气动噪声主要是基频噪声,噪声源分别位于叶片进口处与蜗壳蜗舌处,风机进出口噪声被屏蔽后整机噪声降低约21%;风机蜗壳振动是由于风机内部非定常流动诱发蜗壳结构做振动响应,振源主要位于叶片进口处与蜗壳蜗舌处,振动频率与风机基频一致;在蜗壳中填充相等体积1.5 mm塑料球,2.3 mm塑料球,1.2 mm陶瓷球,3.0 mm陶瓷球用来降低蜗壳振动噪声,在设计工况点以3.0 mm陶瓷球效果最佳,整机噪声下降约2.8%。
A small high-speed low-noise centrifugal fan was tested using an acoustic sensor and a spectrum analyzer.It was found that the aerodynamic noise radiated from the fan inlet and outlet was the most important type of noise of the fan.The aerodynamic noise was mainly the fundamental frequency noise,and the noise source was respectively located at the inlet of the blade and the tongue of the volute,the noise of the fan was reduced by about 21%after the noise of the fan inlet and outlet was shielded;the vibration of the volute of the fan is caused by the unsteady flow inside the fan,and the vibration source is mainly located in the blade and the tongue of the volute,where the vibration frequency is consistent with the fundamental frequency of the fan;the volute was filled with 1.5 mm plastic balls of equal volume,2.3 mm plastic balls and 1.2 mm ceramic balls,3.0 mm ceramic balls were used to reduce the vibration noise of the volute.Under the design condition,the 3.0mm ceramic balls had the best effect,making the noise of the whole fan reduced by about 2.8%.
作者
胡四兵
王弼
陈启明
于跃平
常超
王枭
饶杰
Hu Sibing;Wang Bi;Chen Qiming;Yu Yueping;Chang chao;Wang xiao;Rao jie(State Key Laboratory of Compressor Technology,Hefei General Machinery Research Institute Co.,Ltd.,Hefei 230031,China)
出处
《流体机械》
CSCD
北大核心
2020年第4期1-5,共5页
Fluid Machinery
基金
安徽省重点研究与开发计划项目(1704a0902005)。
关键词
高速低噪声离心风机
试验研究
气动噪声
基频噪声
振动响应
high speed and low noise centrifugal fan
experimental studies
aerodynamic noise
fundamental noise
vibration response
