喷管尺寸对水下排气噪声的影响及降噪方案

发布时间：2018-06-29 08:57

本文选题：水下排气 + 噪声　；参考：《排灌机械工程学报》2016年10期

【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.
[Abstract]:In order to study the effect of nozzle structure on nozzle flow and how to improve nozzle noise, reasonable operating parameters and system structure parameters were designed. Under the same gas flow rate (30 ~ 150 m3 / h), The exhaust noise of two kinds of nozzles with diameter of 10mm and 20mm were studied. The effect of nozzle size on the noise in different frequency bands was obtained by spectrum analysis. On this basis, a multi-nozzle noise reduction scheme is designed, and its effect is verified by experiments. The results show that the underwater exhaust noise in the frequency band of 10 ~ 10 ~ 100 Hz is obviously affected by the nozzle diameter. Reducing the nozzle diameter is helpful to reduce the sensitivity of the noise in the 100 ~ (000 Hz) band to the change of the gas velocity, and the amplitude increases with the increase of the gas velocity. When the gas flow rate is constant, reducing the nozzle diameter will increase the exhaust velocity, which will lead to the noise enhancement in the 100 ~ 1 000 Hz frequency band, and changing the single large diameter nozzle to multiple small diameter nozzle with equal cross-sectional area will help to reduce the underwater exhaust noise.
【作者单位】：浙江大学化学工程与生物工程学院;
【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)
【分类号】：TB535

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