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《Journal of China Coal Society》 2013-11
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Experimental study on longitudinal temperature distribution law of tunnel ceiling based on moving fire source

DENG Jun;LI Shi-rong;YAN Zheng-xin;ZHAO Da-long;College of Energy Science & Engineering,Xi'an University of Science and Technology;Key Laboratory of Westem Mine Enploita tion and Hazard Prevention of Ministry of Education;Yangquan Fire Bureau;Col lege of Science,Xi'an University of Science and Technology;  
In order to reveal the influential law of mobile fire vehicle on the temperature distribution of tunnel ceiling,the 1∶ 20 physical model was designed according to real road tunnel. Under natural ventilation condition,the fire process when mobile fire source with velocity of 0. 5,0. 8 and 1. 0 m / s moved into tunnel then stopped till burned out were studied. The temperature fields when fire source moved into tunnel were studied. The ceiling temperature distribution and temperature peak in fire process and its gradient were analyzed. The research results indicate that: ① Fire source of 0. 5 m / s combusts much more adequately than the other two,which leads the temperature peak of tunnel ceiling 40 and 50 ℃ higher than that of 0. 8 m / s and 1. 0 m / s fire source; ② The existence of moving fire breaks the balance of convective circulation of hot smoke and fresh cold air caused by jet effect,which weakens thermal convection and slows the temperature decrease in tunnel.
【Fund】: 教育部创新团队资助项目(IRT0856);; 陕西省13115科技创新工程资助项目(2010ZDGC-14)
【CateGory Index】: U458.1
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