摘要
为研究喷管结构对管口流动的影响以及如何改善喷管噪声,设计合理的操作参数和系统结构参数,通过试验手段,在相同气体流量（30~150 m3/h）条件下,对2种喷管直径分别为10mm和20 mm的喷管排气噪声进行了研究,通过频谱分析得到喷管尺寸对不同频段噪声的影响.在此基础上设计了一种多喷管降噪方案,并通过试验验证了其降噪效果.结果表明：10~100 Hz频段的水下排气噪声受喷管直径的影响明显,减小喷管直径有利于降低这部分噪声;100~1 000Hz频段的噪声对气速的变化敏感,其幅值随气速的升高而增大;在气体流量一定的情况下,减小喷管直径会使排气速度增大,从而导致100~1 000 Hz频段的噪声增强;将单个大直径喷管改为等截面积的多个小直径喷管有利于降低水下排气噪声.
The noise characteristics of the jets exhausted from nozzles with diameters of 10 mm and 20 mm are experimentally studied at the gas flow rate of 30-150 m3/h. The effects of nozzle size on the underwater exhaust noise in different frequency bands are analyzed. Moreover,the noise reduction effect of a multi-nozzle exhaust scheme is investigated. The results show that the noise with frequencies of 10-100 Hz decrease with nozzle size decreasing. The noise with frequencies of 100-1 000 Hz are sensitive to gas velocity,and would increase with gas velocity increasing. Hence under certain gas flow rate conditions,reducing the nozzle size would increase the noise with frequencies of 100-1 000 Hz.For the reason,replacing a single large-size nozzle with several small-size nozzles would reduce the exhaust noise in the case of the total cross-sectional area unchanged.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2016年第10期878-882,共5页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51606165)
浙江省重大科技专项(2014C01066)
关键词
水下排气
噪声
喷管
降噪
频谱分析
exhaust nozzle
underwater exhaust
noise
noise reduction
spectrum analyze
