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Experimental Study on the Optimal Interval of Exhaust Outlets in a Concentrated Smoke Extraction System
(1 School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081; 2 Key Laboratory of Building Fire Protection Engineering and Technology of MPS, Tianjin 300381)
Abstract The spacing of exhaust outlets is a key factor for the concentrated smoke extraction system, which impacts the smoke control effect. A 22 m-long tunnel model with 1∶20 scale was used to test the effects of a concentrated smoke extraction system with four bi-directional exhaust outlets opened symmetrically with a spacing of 3 m and 5 m, respectively. A contrastive analysis of the temperature beneath the tunnel roof, spread length and thickness of the smoke layer was then carried out with those two different spacings. Results show that while both of the spacings can meet the requirements of safe smoke extraction in tunnel fires, it is safer and more conservative to choose the 3 m spacing, which means the design of an exhaust outlet with 3 m spacing is better than that with 5 m spacing.
Abstract：
The spacing of exhaust outlets is a key factor for the concentrated smoke extraction system, which impacts the smoke control effect. A 22 m-long tunnel model with 1∶20 scale was used to test the effects of a concentrated smoke extraction system with four bi-directional exhaust outlets opened symmetrically with a spacing of 3 m and 5 m, respectively. A contrastive analysis of the temperature beneath the tunnel roof, spread length and thickness of the smoke layer was then carried out with those two different spacings. Results show that while both of the spacings can meet the requirements of safe smoke extraction in tunnel fires, it is safer and more conservative to choose the 3 m spacing, which means the design of an exhaust outlet with 3 m spacing is better than that with 5 m spacing.
JIANG Xue-Peng- 1 Wang-Cheng-Wei- 1 Yu-Nian-Hao- 2
.Experimental Study on the Optimal Interval of Exhaust Outlets in a Concentrated Smoke Extraction System[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(4): 123-128
2016, Vol. 53 