摘要
高速磁浮的噪声主要来源于气动噪声,并且列车未来时速可达到600 km/h,气动噪声与列车速度的6~8次方成正比,会带来线路环境问题。本文以全尺寸高速磁浮列车模型为研究对象,基于延迟分离涡模型方法(DDES),结合磁浮列车流场特性分析其表面噪声产生的机理,为高速磁浮列车气动噪声性能评估和线路声屏障设计提供了依据。主要研究内容如下:由于气流直接冲击和流动分离,磁浮列车头部流线型区域主要声源分布在鼻尖位置,总声压级最大值为106.48 dB;车尾鼻尖处的复杂局部涡流和涡旋脱落是使其成为车尾流线型区域主要噪声源的原因,车尾鼻尖处总声压级最大值为124.75 dB;风挡间隙中的涡流引起了空腔噪声,风挡底部受到空腔噪声和车轨间隙噪声的耦合作用,其产生噪声能量最大,四位风挡底部的总声压级分别为115.94 dB、118.29 dB、123.36 dB和120.05 dB;无线电终端结构光滑度较高,在其表面气流流动平缓没有发生流动分离,表面各个部位声压级水平整体相似,并且车尾处的噪声水平高于车头处。
The noise of high speed maglev train mainly comes from aerodynamic noise,and the future speed of the train can reach 600 km/h.The aerodynamic noise is proportional to 6~8th of the train speed,which will bring line environmental problems.This paper takes the full size high speed maglev train model as the research object,based on the delayed detached eddy simulation method(DDES),and analyzes the mechanism of its surface noise generation in combination with the flow field characteristics of maglev trains,which provides a basis for the evaluation of high speed maglev train aerodynamic noise performance and line noise barrier design.ThE-main research contents are as follows:Due to the direct impact of airflow and flow separation,thE-main noise source in the streamlined area of the head of the maglev train is distributed in the nose position,and the maximum value of total sound pressure level(SPL)is 106.48 dB;The complex local vortex and vortex shedding at the nose of the tail of the train is the reason for making it thE-main noise source in the streamlined area of the tail of the train,and the maximum value of total SPL at the nose of the tail of the train is 124.75 dB;The results show that the cavity noise is caused by vortex in windshield gap,and the noise of windshield bottom is affected by the coupling effect of cavity noise and the gap between vehicle and ground.The maximum sound pressure level(SPL)appears at the windshield bottom,which is 115.94 dB,118.29 dB,123.36 dB and 120.05 dB respectively.Radio terminal surface airflow smooth flow did not occur flow separation,the SPL at each part of the surface is similar overall,and the level at the tail is higher than that at the head.
作者
马智豪
刘永翰
韩珈琪
梅元贵
MA Zhihao;LIU Yonghan;HAN Jiaqi;MEI Yuangui(Gansu Province Engineering Laboratory of Rail Transit Mechanics Application,Lanzhou JiaotongUniversity,Lanzhou 730070,China;China Railway Design Corporation,Tianjin 300308,China)
出处
《兰州交通大学学报》
CAS
2024年第2期85-94,113,共11页
Journal of Lanzhou Jiaotong University
基金
国家重点研发计划项目(2016YFB120060239)。
关键词
时速600公里高速磁浮列车
气动噪声
声源
数值模拟
600 km/h high speed maglev train
aerodynamic noise
noise source
numerical simulation
