排灌机械工程学报
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排灌机械工程学报  2016, Vol. 34 Issue (10): 878-882    DOI: 10.3969/j.issn.1674-8530.16.0054
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喷管尺寸对水下排气噪声的影响及降噪方案
苗天丞, 吴大转, 王乐勤
浙江大学化学工程与生物工程学院, 浙江 杭州 310007
Effect of nozzle size on underwater exhaust noise and noise reduction method
MIAO Tiancheng, WU Dazhuan, WANG Leqin
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang 310007, China
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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10 mm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;100~1 000 Hz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.
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苗天丞
吴大转
王乐勤
关键词喷管   水下排气   噪声   降噪   频谱分析     
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 would decrease with nozzle size decreasing. The noise with frequencies of 100-1 000 Hz are very 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.
Key wordsexhaust nozzle   underwater exhaust   noise   noise reduction   spectyum analyze   
收稿日期: 2016-03-11;
基金资助:国家自然科学基金资助项目(51606165);浙江省重大科技专项(2014C01066)
通讯作者: 苗天丞(1989—),男,黑龙江绥化人,博士研究生(ggggggyes@126.com),主要从事流体噪声理论与控制技术研究.   
作者简介: 王乐勤(1945—),男,山东聊城人,教授,博士生导师(通信作者, hj_wlq2@zju.edu.cn),主要从事流体机械理论及工程研究.
引用本文:   
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.
MIAO Tian-Cheng,WU Da-Zhuan,WANG Le-Qin. Effect of nozzle size on underwater exhaust noise and noise reduction method[J]. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(10): 878-882.
 
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