摘要
针对突扩管管内流噪声降噪问题,本文研究了粘弹性流体在突扩管内的流噪声特性,并揭示了其降噪机理。通过将表面活性剂与水混合,可以得到粘弹性流体,以此控制突扩管内流噪声。基于具有佩特林近似的有限可延展非线性弹性(FENE-P)本构模型,利用Fluent的UDF将其植入N-S方程,结合大涡模拟和Ffowcs Williams-Hawkings方法,对雷诺数为8000、最大聚合物拉伸长度为10、魏森贝格数(We)为0.1至12条件下的突扩管内粘弹性流体流噪声进行计算分析。结果表明:当We到达一定值后,粘弹性流体能够使流场流动趋于稳定,延后涡在管内突扩段的产生位置,从而抑制大涡的发展与形成,降低低频噪声,并且能够显著降低管路内部及管壁处脉动压力和脉动速度,从声源处降低流噪声;随着We的升高,降噪效果增强,降噪频率范围提升,然而,当We超过一定数值后降噪效果将达到阈值。
Aiming at the problem of flow noise reduction in sudden expansion pipe,this paper investigates the flow noise characteristics of viscoelastic fluid in a sudden expansion pipe and reveals the noise reduction mechanism.The flow noise in the sudden expansion pipe could be controlled by viscoelastic fluid which is obtained by mixing the surfactant with water.Based on the finite extensible nonlinear elastic model with Peterlin approximation(FENE-P),the flow noise is calculated by using Fluent UDF,combined with Large Eddy Simulation and the Ffowcs Williams-Hawkings method.The Reynolds number is 8000,the maximum polymer tensile length is 10,and the Weissenberg number(We)ranges from 0.1 to 12.The results show that when We reaches a certain value,the flow field is stabilised and the generation of vortices is delayed.Thus,the formation of large vortex that generates low-frequency noise is inhibited.The fluctuating pressure and fluctuating velocity inside the pipeline and at the pipe wall are reduced significantly,so that flow noise will be suppressed from the perspective of sound source.With the increase of We,the effect of noise reduction is enhanced and the frequency range of noise reduction is extended,but when We exceeds a certain value,the noise reduction effect reaches the threshold.
作者
宋凯耀
靳国永
叶天贵
刘志刚
SONG Kai-yao;JIN Guo-yong;YE Tian-gui;LIU Zhi-gang(College of Energy and Power Engineering,Harbin Engineering University,Harbin 150001,China)
出处
《船舶力学》
北大核心
2026年第1期147-158,共12页
Journal of Ship Mechanics
基金
国家自然科学基金资助项目(52241101,52225109)。
关键词
粘弹性流体
流噪声
突扩管
降噪
viscoelastic fluid
flow noise
sudden expansion pipe
noise reduction
