排灌机械工程学报2016，Vol.34Issue(10)：878-882,5.DOI:10.3969/j.issn.1674-8530.16.0054
喷管尺寸对水下排气噪声的影响及降噪方案
Effect of nozzle size on underwater exhaust noise and noise reduction method
摘要
Abstract
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 ex-haust noise in the case of the total cross-sectional area unchanged.关键词
水下排气/噪声/喷管/降噪/频谱分析Key words
exhaust nozzle/underwater exhaust/noise/noise reduction/spectrum analyze分类
数理科学引用本文复制引用
苗天丞,吴大转,王乐勤..喷管尺寸对水下排气噪声的影响及降噪方案[J].排灌机械工程学报,2016,34(10):878-882,5.基金项目
国家自然科学基金资助项目（51606165）；浙江省重大科技专项 （）
