摘要
受电弓及其空腔部位是高速列车主要的气动噪声源,降低这种噪声尤为重要。在以往的高速列车气动噪声研究中,对受电弓空腔部位的关注较少。针对高速列车受电弓及其空腔气动降噪问题,文中采用数值计算方法,研究简化的高速列车模型在350 km·h^(-1)下,受电弓空腔前缘射流降噪处理方式的流场特性和噪声传播规律。结果表明,在纯空腔前缘施加射流可以显著降低空腔内和受电弓附近的非定常流动,当射流速度为27 m·s^(-1)时,空腔后壁声源在空腔顶部和侧部辐射噪声的声压级降低最大值为5 dB,受电弓侧面监测点的噪声显著降低。文中研究为低马赫数下的过渡式空腔射流降噪研究提供了参考。
The pantograph and its cavity are the main sources of aerodynamic noise in high-speed trains,and it is particularly important to reduce this noise.There is less attention paid to the pantograph cavity compared to the pantograph in previous studies on aerodynamic noise of high-speed trains.In view of the problem of aerodynamic noise reduction of high-speed train pantograph and its cavity,numerical calculation methods are utilized to investigate the flow field characteristics and the law of noise propagation of the simplified high-speed train model under the condition of 350 km·h^(-1).The results show that the application of jet on the front edge of the pure cavity can significantly reduce the unsteady flow in the cavity and near the pantograph.When the jet velocity is 27 m·s^(-1),the maximum reduction in sound source pressure level of radiated noise on the back wall to the top and side of the cavity is 5 dB,and the noise at the monitoring point on the side of the pantograph is significantly reduced.The proposed study provides a direction for the research of transitional cavity jet noise reduction under low Mach number.
作者
唐则男
苗晓丹
杨俭
袁天辰
TANG Zenan;MIAO Xiaodan;YANG Jian;YUAN Tianchen(School of Urban Rail Transportation,Shanghai Univercity of Engineering Science,Shanghai 201600,China;School of Mechanical and Automotive Engineering,Shanghai Univercity of Engineering Science,Shanghai 201600,China)
出处
《电子科技》
2023年第4期29-35,共7页
Electronic Science and Technology
基金
国家自然科学基金(52172372,U1834201)。
关键词
数值仿真
湍流模型
高速列车
气动声学
受电弓空腔
低马赫数
过渡式腔
射流降噪
numerical simulation
turbulence model
high-speed train
aeroacoustics
pantograph cavity
low Mach number
transitional cavity
jet noise reduction
