摘要
为明确管网下并联通风机的调节依据,依托并联通风实验平台,进行了通风性能、噪声实验。首先,对比了并联通风机在风量及功耗上的差异,并量化通风性能,得到通风性能最优组。在此基础上,结合噪声分布规律、频谱特征及噪声评价数,阐述噪声变化特征,找出不利工况点,优化调频依据。结果表明:5号通风机的频率大于4号通风机时,通风性能最优,且通风性能系数与声压级呈正相关;并联通风机的中低频噪声,能量主要集中在5,7,9倍基频差值的频率范围上。基于声压级、噪声评价数,发现不利工况噪声的显著变化集中在低频段及倍频程中心频率为500 Hz时。最后,提出高效低噪的并联通风机调节方案为:远排风井端通风机转速应大于近排风井端通风机,调频频率差值应<5 Hz,且应避免设置调频频率和为55,75 Hz。
The selection of the adjustment basis directly affects the ventilation system,such as performance and power consumption.In order to clarify the adjustment basis of parallel fans under pipe network,the power and air volume of parallel fans were measured,and the ventilation performance was quantified,which obtain the optimal group of ventilation performance.On this basis,the distribution of noise was used to determine the adverse working conditions.The properties of noise changes were specified using spectral characteristics and noise evaluation numbers.The results show that the frequency of the 5#fan is higher than that of the 4#fan,the exhaust performance is optimal,and the ventilation coefficient of performance is proportional to sound pressure level.The medium and low frequency discrete noise energy of parallel fans,which is integer multiple of the fundamental frequency difference,mainly concentrated in the range of 5,7 and 9 times.In unfavorable working conditions,the significant changing point of noise is in the low frequency band,and the octave center frequency is 500Hz.Finally,the high-efficiency parallel fans adjustment strategy is proposed,the RPM of the fan at the far end of the exhaust shaft should be greater than that near from one,the frequency difference of parallel fans should be less than 5 Hz,and the total frequency of frequency modulation should be avoided to be 55 and 75 Hz.
作者
董向阳
陈世强
陈永平
朱辉
张凤君
任玲
朱祝龙
李石林
Dong Xiangyang;Chen Shiqiang;Chen Yongping;Zhu Hui;Zhang Fengjun;Ren Ling;Zhu Zhulong;Li Shilin(School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Department of Energy Engineering and Building Environment,Guilin University of Aerospace Technology,Guilin 541004,China;Qingdao Metro Group Co.,Ltd,Qingdao 266000,China;Tunnel Design Branch,China Railway Liuyuan Group Co.,Ltd,Tianjin 300133,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第S01期314-319,共6页
Environmental Engineering
基金
国家自然科学基金项目(51864014)
交通运输部交通运输行业重点科技项目清单(2021-MS5-126)
广西交通运输行业重点科技项目清单(桂交便函[2021]148号18)
湖南省自然科学基金项目(2021JJ60053)
关键词
调节依据
并联通风机
通风性能系数
噪声分布
频谱特征
噪声评价数
adjustment basis
parallel fans
ventilation performance coefficient
noise distribution
spectrum characteristics
noise rating number
