本文關(guān)鍵詞：地鐵長(zhǎng)區(qū)間隧道火災(zāi)通風(fēng)模式與排煙研究　出處：《西安建筑科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 地鐵長(zhǎng)區(qū)間隧道 小尺寸實(shí)驗(yàn) 數(shù)值模擬 煙氣溫度 CO濃度 能見(jiàn)度

【摘要】：目前針對(duì)地鐵區(qū)間隧道火災(zāi)的研究較多，發(fā)生火災(zāi)時(shí)大多數(shù)研究對(duì)象為只有一列列車滯留在區(qū)間隧道中，而對(duì)于地鐵長(zhǎng)區(qū)間隧道中發(fā)生火災(zāi)時(shí)有兩輛或多輛列車同時(shí)在該區(qū)間隧道運(yùn)行的研究比較少見(jiàn)。通常地鐵長(zhǎng)區(qū)間隧道采用設(shè)置中間豎井的方式，將長(zhǎng)區(qū)間分隔成兩個(gè)或幾個(gè)短區(qū)間，通過(guò)通風(fēng)豎井將著火列車隔離在獨(dú)立的通風(fēng)區(qū)間內(nèi)，控制每個(gè)短區(qū)間隧道中只有一列列車滯留，此時(shí)火災(zāi)區(qū)間段的煙控模式與標(biāo)準(zhǔn)區(qū)間隧道相同。本文主要研究在地鐵長(zhǎng)區(qū)間隧道設(shè)置中間豎井方式下，中部著火的列車停在豎井處時(shí)火災(zāi)煙氣的流動(dòng)特性。本文主要的工作和研究結(jié)果如下： （1）根據(jù)弗諾德相似準(zhǔn)則，建立由區(qū)間隧道和不同高度豎井組成的1:10局部地鐵區(qū)間隧道實(shí)驗(yàn)?zāi)Ｐ汀＠秒娮映訙y(cè)試三種不同尺寸油盤的質(zhì)量損失率，并計(jì)算出對(duì)應(yīng)的火源強(qiáng)度，記錄火災(zāi)時(shí)隧道內(nèi)溫度分布和CO濃度分布數(shù)據(jù)。 （2）研究煙氣自然填充時(shí)，不同火源強(qiáng)度和不同豎井高度下，隧道內(nèi)的頂棚溫度分布、人眼特征高度處（距疏散平臺(tái)高度1.7m，，距軌底高度2.75m）溫度分布和CO濃度分布規(guī)律。火源強(qiáng)度一定時(shí)，研究不用縱向通風(fēng)速度和豎井排煙速度下，隧道內(nèi)的頂棚溫度分布、人眼特征高度處溫度分布和CO濃度分布規(guī)律。 （3）利用FDS軟件建立與實(shí)驗(yàn)臺(tái)對(duì)應(yīng)的全尺寸隧道模型，對(duì)隧道內(nèi)的溫度分布和CO濃度分布進(jìn)行對(duì)比分析。 （4）利用FDS軟件建立180m長(zhǎng)全尺寸地鐵區(qū)間隧道模型。通過(guò)數(shù)值模擬分別研究煙氣在自然填充和機(jī)械縱向通風(fēng)下煙氣的蔓延規(guī)律、頂棚溫度分布、人眼特征高度處溫度分布、CO濃度分布和能見(jiàn)度分布。
[Abstract]:At present, there are many researches on the subway tunnel fire, most of the research objects are only one train stranded in the interval tunnel when the fire occurs. However, it is rare to study that there are two or more trains running in the tunnel at the same time when there is a fire in the long interval tunnel. Usually, the way of setting middle shaft is used in the long interval tunnel. The long section is separated into two or several short sections, and the fire train is isolated in a separate ventilation section through the ventilation shaft, and only one train is detained in each short section tunnel. The smoke control mode of the fire section is the same as that of the standard section tunnel. The flow characteristics of fire smoke when the train on fire stops at the shaft. The main work and results of this paper are as follows: 1) based on the Vernon similarity criterion, an experimental model of 1:10 local subway tunnel consisting of interval tunnel and shaft with different height is established. The mass loss rate of three kinds of oil trays with different sizes is measured by electronic scale. The corresponding fire intensity was calculated and the temperature distribution and CO concentration distribution data were recorded. 2) when the smoke is filled naturally, the temperature distribution of the roof and the height of the human eye (1.7 m from the evacuation platform) in the tunnel under different fire source intensity and different shaft height are studied. The temperature distribution and CO concentration distribution law from the rail bottom height is 2.75 m). When the fire source intensity is constant, the temperature distribution of the roof in the tunnel is studied without longitudinal ventilation speed and smoke exhaust velocity of the shaft. Temperature distribution and CO concentration distribution at the characteristic height of human eye. (3) the full-scale tunnel model corresponding to the test bench was established by using FDS software, and the temperature distribution and CO concentration distribution in the tunnel were compared and analyzed. (4) the model of 180m long full-size subway tunnel is established by using FDS software. Through numerical simulation, the spread law of flue gas under natural filling and mechanical longitudinal ventilation is studied, and the temperature distribution of roof is also studied. Temperature distribution, CO concentration distribution and visibility distribution at the characteristic height of the human eye.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U231.96;U458

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