摘要
高压气体将水下航行体贮容器内污水吹除至海中的过程中形成了水下射流场并产生水和气体射流噪声。为研究吹除过程中流动特征与噪声特性,采用VOF模型和大涡模拟法对不同吹除压力下产生的湍射流场进行数值模拟,并结合FW-H积分方程对射流辐射噪声进行了计算,最后进行实验验证。结果表明:根据流场特征,可将吹除过程分为稳定排水、瞬间排气、稳定排气三个阶段;水和气体射流噪声的模拟与实验声压级结果变化趋势一致,且最大误差在5 dB以内;气体射流噪声为吹除过程主要噪声源,其频谱呈现“宽频带”、“山峰状”特征,频率集中在0.1~3 kHz以内,1~2 kHz频段有高峰值,且主要由气泡从喷口脱落和气泡噪声产生。
High-pressure gas blows off the sewage,which stored in the container in the underwater vehicle,to the sea.And the process forms underwater jet field and generates water and gas jet noise.In order to study the flow and noise characteristics during the blowing process,jet flow fields at different blowing pressures are simulated with the VOF model and large eddy simulation.FW-H equation is applied to compute radiated jet noise.At last,verificaiton tests are carried out.The results show that the blowing process is divided into three stages:stable drianage,transient exhaust and stable exhaust according to flow field characteristics.Results of sound pressure level of water and gas jet noise in simulations and experiments,whose maximum error is less than 5 dB,are consistent in the trend.Gas jet noise is the main noise source in the blowing process.The frequency spectrums present characteristics of"wideband"and"peak".Frequencies are concentrated within 0.1~3 kHz which mainly caused by falling off the nozzle and bubble noise,and high peak is around 1~2 kHz.
作者
邢允
张凌
胡秋旭
李伟
吴大转
XING Yun;ZHANG Lin;HU Qiu-Xu;LI Wei;WU Da-Zhuan(Institute of Process Equipment,College of Energy Engineering,Zhejiang University,Hangzhou 310027,China;Wuhan Second Ship Design and Research Institute,Wuhan 430205,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第8期1799-1805,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.91634110)
关键词
射流噪声
水下排污
声压级
大涡模拟
jet noise
underwater sewage
sound pressure level
large eddy simulation
