摘要
地铁作为一种地下建筑,具有一定的密封性,其内部有显著的内热源。列车在区间内的运行,伴随着将输入的电能转换为热量排放到区间内。根据列车的运行状态,将发热量定量分析,拟合了单列列车在1 000 m隧道区间运行中,以不同最高时速运行时下,单次列车通过的区间的得热量。匀速运行时的列车产热占到了54%,制动过程的发热强度最大。将列车在区间内运动简化为物理模型,列车的运行的过程产热作为移动内热源,采用动网格技术模拟了区间隧道的非稳态热环境。对列车动态环境下的热量分配进行了线性回归,表明留在区间隧道内热量较小,大部分热量随着活塞风的传递作用进入前方站台和前方隧道区间,列车运行速度对热量分配存在不一的影响。
The subway as one of the underground constructions has some air tightness and prominent heat source inside.Part of the electricity for train operation will be transferred to heat,which emits into the tunnel during train moving.Quantitative analysis of heat generated is undertaken according to the train running condition.Curve fitting method is used to estimate heat gain of tunnel after one train running across 1000m long tunnel under different maximum velocity.There is 54% heat generated when the train runs in uniform speed.Strongest calorific intensity takes on during train braking.The train running in tunnel is simplified into a physical model.To simulate the unsteady thermal condition of tunnel,motive grid methodology is used,where heat load generated by train running is taken as motive internal heat source.Linear regression for heat distribution in case of train running indicates that most part of heat moves forward to platform and tunnel ahead due to the effect of train induced wind,however,less of them stay in tunnel.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第6期1312-1317,1323,共7页
Chinese Journal of Underground Space and Engineering
基金
上海市自然科学基金项目(07dz12022)
关键词
地铁
热环境
区间隧道
内热源
subway
thermal environment
tunnel section between stations
internal heat source
