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Numerical Simulation Study on the Combined Fire Ventilation in Crossing-River Tunnel

Author: LiangYuan
Tutor: FengLian
School: Southwest Jiaotong University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Cross-river tunnel Fire Combination of ventilation Numerical Simulation
CLC: U458.1
Type: Master's thesis
Year: 2007
Downloads: 217
Quote: 7
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Abstract


The combination of ventilation is a new mode of ventilation , it is more idealistic, to meet the requirements of the tunnel ventilation . This paper describes the characteristics of the tunnel space , the existing combination of ventilation mode , and tunnel fire research methods and the status quo . Especially the tunnel center location of the fire , using the commercial CFD numerical simulation software , follow the law of conservation of the fire process parameters change , the establishment of a three-dimensional mathematical and physical model of tunnel fire ventilation . Discrete processing and the finite volume method , the governing differential equations of the model , and then apply the SIMPLEC algorithm to solve it . Wuchang - Hankou cross-river tunnel is the two - hole one-way traffic , Because of its specificity longitudinal blower combination of semi-transverse exhaust ventilation , there is the problem of the exhaust outlet spacing uncertain diverse and ventilation solutions . The event of a fire in the tunnel must be timely and effective hot smoke stream discharged from the tunnel . Different ventilation program will have a great impact on the development of the fire , the fire plume control . Therefore, in order to the Wuchang - Hankou cross-river tunnel the left hole river bottom section as the research object , using CFD method , for the fire broke out in the tunnel , the numerical simulation of multiple loading conditions . This paper simulates the open upstream vent , different supply and exhaust shafts , longitudinal blower speed , turn on the combination of the number of exhaust vents and exhaust vents spacing conditions , draw their speed within the tunnel carriageways and flue field, temperature field . And in accordance with the the evacuation tunnel safety requirements and the tunnel structure , equipment , shaft axial fan working environment requirements , determine a reasonable open outlet , supply and exhaust shafts , the best longitudinal blower speed and row the smoke vents spacing ultimately determine a the best ventilated program that should be taken when the fire broke out in the tunnel at the most unfavorable position . On this basis , the other on a tunnel fire conditions simulated to determine when the fire occurred at a different location within the tunnel , you can take reasonable ventilation .

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CLC: > Transportation > Road transport > Tunnel project > Tunnel safety and accident > Security technology
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