Longitudinal smoke exhaust zone division and fan matching calculation for multi-ramp tunnel

doi:10.16265/j.cnki.issn1003-3033.2020.05.021

Abstract

Abstract: In order to solve design difficulties in longitudinal smoke evacuation of multi-ramp tunnels, it was disassembled into two types of forked structures, merging and splitting, according to tunnel structural characteristics and traffic flow direction, and division principle and method of smoke evacuation zones were proposed. Then, action orientation, cooperative relationship and select range of fans of adjacent zones were determined, and feasible jet fan matching schemes were presented based on theories of pressure balance and mass balance. Finally, rationality of these schemes was verified through numerical simulations for multiple fire locations. The results show that the proposed method has good adaptability for longitudinal smoke evacuation design of different fire locations. Moreover, multiple jet fan schemes obtained from it could achieve similar smoke exhaust effects.

Key words: multi-ramp tunnel, smoke evacuation zone, fan matching, numerical simulation, forked units

CLC Number:

X932

SONG Xiyu, YANG Dong, CHEN Jianzhong. Longitudinal smoke exhaust zone division and fan matching calculation for multi-ramp tunnel[J]. China Safety Science Journal, 2020, 30(5): 136-142.

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