Influence of constraint effect of sidewall on maximum smoke temperature distribution under a tunnel ceiling. (5th February 2017)

• Record Type: Journal Article
• Authors: Zhou, Tiannian; He, Yaping; Lin, Xiao; Wang, Xuehui; Wang, Jian
• Is Part Of: Applied thermal engineering. Volume 112(2017:Feb.)
• Page Start: 932
• Page End: 941
• Publication Date: 2017-02-05
• Subjects: Tunnel fire -- Ceiling -- Constraint effect -- Sidewall -- Maximum temperature distribution; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2016.10.111
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Fire experiments and simulations carried out in a full-scale tunnel. Maximum smoke temperature data beneath ceiling obtained with constraint effect. Transverse distance factor is included into the current equations. Modified correlation agrees with the previous data. Abstract: A sequence of tests and simulations with varying transverse fire locations were conducted in a full-scale tunnel to investigate the constraint effect of sidewall on the maximum smoke temperature distribution under a tunnel ceiling. Then, the simulated results were comprehensively compared with both those of the full-scale tests and the model-scale experiments from previous studies. The results of the full-scale experiment show that the longitudinal maximum smoke temperature rise distribution decreases can be approximated by a power function. However, the numerical simulation results indicate that an exponential distribution may be plausible. The normalized ceiling jet temperature rise at the impingement point displays an exponential variation with the distance between the fire source and the sidewall. Meanwhile, regression models taking the constraint effect of sidewall into account was developed to predict the ceiling jet impingement temperature in tunnel fires.