汽车集成水箱噪声数值模拟研究  

Numerical Simulation Study on Noise of Integrated Water Tank in Automobiles

作　　者：束正勇 金莹莹 魏延军 白慧龙 Shu Zheng-yong;Jin Ying-ying;Wei Yan-jun;Bai Hui-long(Shanghai Feilong New Energy Auto Parts Co.,Ltd.,Shanghai 201111)

机构地区：[1]上海飞龙新能源汽车部件有限公司,上海201111

出　　处：《内燃机与配件》2024年第4期35-38,共4页Internal Combustion Engine & Parts

摘　　要：针对汽车集成水箱正常工况下水流翻滚噪声机理,采用声学Lighthill声类比理论与计算流体力学(CFD)流场耦合,对水箱电机侧进行数值模拟研究。本文采用SST(Menter)K-Omega分别对优化前与优化后水箱内部结构进行流场定常分析以及通过分离涡模型进行非定常求解,输出水箱内部压力与速度云图、叶轮脉动压力云图,然后作为声学有限元与无限元数值计算的输入进行直接频响分析,对比不同模式下水流噪声,分析水箱内部声压级变化。结果表明:冷却液翻滚声主要集中在50~500Hz,通过箱体传递,内部水箱挡板处形成明显的涡流现象,声压级分布较大,整体属于宽带噪声特性曲线。优化流道板模型水箱噪声降低3.65dB,涡流强度减小。研究结果对汽车水箱设计和性能改造提供很多的理论基础。Aiming at the mechanism of water flow rolling noise in the integrated water tank under normal working conditions,the acoustic Lighthill analogy theory and Computational fluid dynamics(CFD)flow field coupling were used to conduct numerical simulation research on the motor side of the water tank.This article uses SST(Menter)K-Omega to perform steady flow analysis on the internal structure of the water tank before and after optimization,as well as unsteady solution using a separated vortex model.The internal pressure and velocity cloud map of the water tank and the impeller pulsation pressure cloud map are output,and then used as input for acoustic finite element and infinite element numerical calculations for direct frequency response analysis.Different modes of water flow noise are compared to analyze the changes in the internal sound pressure level of the water tank.The results show that the rolling sound of the coolant is mainly concentrated in the range of 50-500Hz,transmitted through the box,and a significant eddy current phenomenon is formed at the internal water tank baffle.The sound pressure level distribution is relatively large,and the overall noise characteristic curve belongs to the broadband noise.Optimize the channel plate model to reduce water tank noise by 3.65dB and reduce eddy current intensity.The research results provide a lot of theoretical basis for the design and performance improvement of automotive water tanks.

关 键 词：集成水箱 Lighthill声类比 有限元 无限元 流动噪声 

分 类 号：U463.9[机械工程—车辆工程]