摘要
电力隧道通风设计中,通常使用断面平均风速计算沿程阻力。由于受防火隔断阻挡,隧道内风速分布不均且防火门附近湍流明显,而通风阻力设计所采用的系数未考虑上述影响。数值研究了电力电缆防火隔断对气流分布和通风阻力的影响。结果表明,不论是否设置电缆,近壁面速度小于断面平均风速,防火门洞两侧涡流增加了局部阻力,且相关标准中未考虑的沿程阻力不可忽略。建议将沿程阻力系数和局部阻力设计计算结果分别放大6倍和3倍作为通风设计依据。
In the ventilation design of a power cable tunnel(PCT),the frictional resistance(FR)is usually determined using the sectional average wind velocity(SAWV).However,due to the blocking effect of the fire partition,the velocity distribution in the tunnel is not generally uniform,and the turbulence effect near the fire doors is also significant,causing the default practice for the design calculation to be difficult to take the above effects into consideration.Thus,the effects of fire partitions in PCT on airflow distribution and the characteristics of ventilation resistance are investigated numerically.The results show that the wind speed near the wall is much lower than the average wind speed of the tunnel section,regardless of whether the cable is set up.The vortex in the region near the fire door increases the local resistance,and FR,which is not considered in the relevant standards,cannot also be ignored.It is recommended that the coefficient of FR and local resistance derived from the design calculation should be enlarged by 6 times and 3 times respectively as the basis for the ventilation design.
作者
王亮
汪雄平
成瑾
钟珂
Wang Liang;Wang Xiongping;Cheng Jin;Zhong Ke
出处
《洁净与空调技术》
2025年第1期25-28,共4页
Contamination Control & Air-Conditioning Technology
关键词
电力电缆隧道
通风设计
局部阻力
沿程阻力
extra-long power cable tunnel
ventilation shaft spacing
energy saving
ventilation airflow rate
作者简介
王亮,男,1987年01月生,硕士,高级工程师,200000,上海市中山西路1999号上海隧道院环控所,18817334026,E-mail:583174453@qq.com。
