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Gas characteristics and effectiveness of smoke control systems in elevator lobbies during elevator evacuation in a high-rise building fire

機(jī)譯：高層建筑火災(zāi)中電梯疏散過程中電梯大廳煙氣控制系統(tǒng)的氣體特性和有效性

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Elevator evacuation has attracted increasing attention as an efficient transport method in high-rise buildings, which is one of the most complex and interesting areas of modern fire research. Through a 3D numerical model built from ANSYS Fluent, this paper studied the influence of elevator motion on the gas characteristics as well as the effectiveness of the smoke control system in the lobby during elevator evacuation in a high-rise building fire. Pressure distribution, temperature distribution and CO concentration distribution in the elevator lobby were analyzed. It was found that the elevator motion decreased the pressure in the elevator lobby while increased the temperature and CO concentration, which indicated that more fire smoke had spread into the lobby when the elevators moved and the effectiveness of the smoke control systems had been weaken. When the elevator velocity was increased from 0m/s to 2m/s, the lowest pressure in the lobby was decreased by 566.7%; the temperature line was mostly above the line representing the still elevator; the CO concentration experienced the most change at the height of 2m: the highest CO concentration was, respectively, increased by 30.4% and 26.7% when the air supply volume (q(s)) was 0m(3)/h and 20000m(3)/h. As the air supply volume in the lobby increased, the pressure was increased while the temperature and the CO concentration was decreased. Changes of temperature lines and CO concentration lines under various air supply volumes were very similar. When q(s) was increased from 0m(3)/h to 20000m(3)/h, the pressure in the lobby was increased from 0Pa to around 8Pa, the highest temperature and CO concentration were decreased by 23.8% and 87.5%, respectively.
機(jī)譯：作為高層建筑中的一種有效的運(yùn)輸方法，電梯疏散已引起越來越多的關(guān)注，這是現(xiàn)代消防研究中最復(fù)雜，最有趣的領(lǐng)域之一。通過ANSYS Fluent建立的3D數(shù)值模型，研究了高層建筑火災(zāi)中電梯疏散過程中電梯運(yùn)動對氣體特性的影響以及大堂煙氣控制系統(tǒng)的有效性。分析了電梯大堂的壓力分布，溫度分布和CO濃度分布。發(fā)現(xiàn)電梯的運(yùn)動降低了電梯大堂中的壓力，同時增加了溫度和一氧化碳濃度，這表明當(dāng)電梯移動時，更多的火煙已經(jīng)散布到大堂中，并且煙氣控制系統(tǒng)的有效性減弱了。當(dāng)電梯速度從0m / s增加到2m / s時，大廳的最低壓力降低了566.7％；溫度線大部分在代表靜止電梯的線的上方； CO濃度在2m高度變化最大：當(dāng)送風(fēng)量（q（s））為0m（3）/ h和20000m（3）時，最高CO濃度分別增加30.4％和26.7％ ）/H。隨著大廳中空氣供應(yīng)量的增加，壓力增加，而溫度和CO濃度降低。不同供氣量下溫度線和CO濃度線的變化非常相似。當(dāng)q（s）從0m（3）/ h增加到20000m（3）/ h時，大廳壓力從0Pa增加到8Pa附近，最高溫度和CO濃度分別降低23.8％和87.5％，分別。

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