China Safety Science Journal ›› 2017, Vol. 27 ›› Issue (10): 50-55.doi: 10.16265/j.cnki.issn1003-3033.2017.10.009

• Safety Science of Engineering and Technology • Previous Articles     Next Articles

Model for prediction of critical smoke extraction rate from road tunnel with central exhaust system

JIANG Xuepeng1,2, CHEN Shu1,2, GUO Kun1,2   

  1. 1 School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan Hubei 430081, China;
    2 Fire Safety Technology Institute, Wuhan University of Science and Technology, Wuhan Hubei 430081, China
  • Received:2017-08-10 Revised:2017-09-16 Online:2017-10-20 Published:2020-11-05

Abstract: To design a reasonable smoke exhaust volume for the road tunnels with a central exhaust system , the influence of the critical smoke exhaust rate on the efficiency of the central exhaust system was studied with a 1∶20 scale tunnel model. By measuring the smoke layer temperature, thickness at 6 heat release rates and different mechanical smoke exhaust volumes, and these critical smoke extraction rate test values, corresponding to the plugholing phenomena, were obtained under different heat release rates. A comparison was made between the values of model test and the calculated values. The differences between three kinds of critical smoke exhaust rate calculation models were analyzed. By introducing a correction coefficient of heat release rate to the TM 19-1995 model, an exponential expression was obtained for corrected critical smoke extraction rate as a function of the heat release rate. The results show that the critical smoke extraction rates calculated by both the Heselden model and the TM 19-1995 model, are smaller than the measured rates, and there is a linear correlation relation between the critical smote extraction rate and the heat release rate.

Key words: road tunnel, small scale model, central exhaust system, plugholing, critical smoke extraction rate calculation model

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