地铁全封闭声屏障阻塞工况自然通风效果模拟研究  

Numerical Study on Ventilation Effect of Fully-enclosed Noise Barrier for Subway under Blocking Condition

作　　者：刘冰 杨启凡 邵建霖 余涛[2] Liu Bing;Yang Qifan;Shao Jianlin;Yu Tao(China Railway Engineering Design and Consulting Group Co.,Ltd,Beijing,100055;Southwest Jiaotong University,Chengdu,610031)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055 [2]西南交通大学,成都610031

出　　处：《制冷与空调（四川）》2022年第1期54-60,共7页Refrigeration and Air Conditioning

摘　　要：全封闭声屏障的设计可有效减小地铁列车在高架线上运行产生的噪声。针对北京某地铁线路高架段的全封闭声屏障结构,采用三维数值模拟计算的方法,对列车阻塞工况该高架段全封闭声屏障顶部不同开口下的自然通风效果进行模拟研究。结果表明:全封闭声屏障顶部不开口时,阻塞工况声屏障内空气平均温度最高可达70℃,不满足设计要求;相同开口率下,开口位置越靠近声屏障顶部中间位置,声屏障内通风换气量越大,热气流越易从顶部开口处流出,降温效果越好;开口位置靠近声屏障侧面时,顶部热气流较难排出,通风效果差;声屏障顶部采用通风消声百叶净开口率为5%时,各断面空气平均温度仍低于40℃,满足设计要求。The design of fully-enclosed sound barrier can effectively reduce the noise generated by the subway train running on the elevated line. Aiming at the fully-enclosed sound barrier structure of an elevated section of a subway line in Beijing, the natural ventilation effect of the fully-enclosed sound barrier at the elevated section with different openings under the blocking condition is studied by using the method of three-dimensional numerical simulation. Results show that when there is no opening at the top of the fully-closed sound barrier, the average air temperature inside the sound barrier under blocking condition can reach up to 70℃, which does not meet the design requirements. Under the same opening rate, when the opening position is closer to the middle of the top sound barrier, the ventilation rate in the sound barrier is larger. Warm air flow flows out from the opening more easily, and the cooling effect is excellent. When the opening is close to the side of the sound barrier, it is difficult to remove the warm air at the top, and the ventilation effect is poor. When ventilation silencing louvers are adopted at the top of the sound barrier with the net opening rate of 5%, the average air temperature of each section is still lower than 40℃, meeting the design requirements.

关 键 词：地铁 全封闭声屏障 噪声治理 通风效果 数值模拟 

分 类 号：U231.5[交通运输工程—道路与铁道工程]