Academic Journal
基于缩尺试验的地铁区间隧道火灾顶板下 烟气纵向及竖向温度分布规律.
| Τίτλος: | 基于缩尺试验的地铁区间隧道火灾顶板下 烟气纵向及竖向温度分布规律. |
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| Alternate Title: | Longitudinal and Vertical Smoke Temperature Distribution Patterns Beneath Tunnel Ceiling in Metro Interval Tunnel Fire Based on Scaled-Down Tests. |
| Συγγραφείς: | 于 伟1 441924174@qq.com, 陈 肖1, 梁秋彦1, 차明轩2, 李龙越2, 徐 琳2 xlzxq@sdjzu.edu.cn, Wei, YU1, Xiao, CHEN1, Qiuyan, LIANG1, Mingxuan, QIU2, Longyue, LI2, Lin, XU2 |
| Πηγή: | Urban Mass Transit. 2026, Vol. 29 Issue 5, p48-56. 9p. |
| Θεματικοί όροι: | *Temperature distribution, *Scale invariance (Statistical physics), *Subways, *Firefighting, *Fire prevention |
| Abstract (English): | [Objective] As metro interval tunnels are long and narrow confined spaces, in the event of a fire, human life safety can be extremely severely threatened. Therefore, it is imperative to conduct fire tests to summarize the longitudinal and vertical smoke temperature distribution patterns beneath the tunnel ceiling, and to clarify the characteristics of smoke diffusion and settlement. [Method] With a 1:20 scaled-down tunnel model, the smoke temperature distribution in the tunnel central cross-section under different fire conditions is measured through varying the fire source elevation height and fire intensity. The variation patterns of the maximum smoke temperature beneath the tunnel ceiling, the longitudinal attenuation of smoke temperature, and the vertical temperature distribution with the fire source elevation height and fire intensity are investigated. [Result & Conclusion] The derived dimensionless formula for the maximum smoke temperature rise beneath the ceiling, and the fitted formula for the longitudinal attenuation of smoke temperature rise are accurate and widely applicable, which can be used to predict the longitudinal smoke temperature distribution beneath the ceiling in metro interval tunnels. Taking the thermal Gaussian layer thickness and the maximum smoke temperature as the characteristic smoke layer height and characteristic temperature rise, a dimensionless analysis of more than 540 temperature data from 10 test cases shows that the vertical smoke temperature variation follows the same smooth curve, independent from the horizontal position of the fire source, fire intensity, and fire source elevation height. This indicates that the vertical smoke temperature distribution in the tunnel follows a self-similarity law. The experimental data are in good agreement with the vertical smoke temperature distributions reported in other literature, confirming the self-similarity of the vertical temperature distribution. The dimensionless fitted formula for the vertical smoke temperature distribution is accurate and widely applicable. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): | [目的] 地铁区间酸道为狭长受限空间, 一旦发生 火灾, 将会对人员生命安全造成极大威胁。对此, 有必要开 展火灾试验, 进而 总 结顶板下烟 气纵向 及환向 温度分布规 律, 得到烟气扩散、沉降特性。[方法] 利用 1:20 缩尺寸 酸道模型, 通过改变火源抬升高度及火灾强度, 实测 了 不同 起 火 条件 下 的 酸道 内中 心 断面 烟气 温度 分布。探 讨了顶 板 下方最高烟气温度、烟气纵向温度衰减, 以及환向温度分布 随火源抬升高度及火灾强度改变的变化规律。[结果及结 论] 得到的量纲一化顶板下方最高烟气温升公式及烟气温 升纵向衰减拟合公式, 具有准确性与广泛适用性, 可用于地 铁区间酸道顶板下方烟气纵向温度分布预测。以热高斯层 厚度及最高烟气温度为特征烟层高度及特征温升, 将 10 组 试验工况 540 余个温度数据量纲一化发现, 其환 向 温度变化 符合同一条光滑曲线, 同火源水平位置、火灾强度及火源抬 升高度无关, 表明酸道 内 환向烟气 温度分布符合自相似规 律。该试验数据与其他文献的환向烟气温度分布具有较好 一致性, 证 明 了 환 向 温度分布的 自 相似性。量纲一化환 向烟 气温度分布拟合公式具有广泛适用性。 [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: | Academic Search Index |
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