Effect of effective ceiling height on tunnel smoke temperature under semi horizontal ventilation
In order to study the effect of ceiling effective height on smoke temperature distribution in tunnel under semi-transverse ventilation,a tunnel model with reduced size of 1∶10 was established for experimental study.By changing the ventilation speed,the size of the oil pool and the effective height of the ceiling,the variation law of the maximum temperature of the flue gas in the fuel ceiling and the longitudinal distribution characteristics of the flue gas temperature were studied.The results show that with the increase of the effective ceiling height,the maximum temperature rise of the ceiling decreases gradually,and the longitudinal attenuation of the flue gas temperature of the tunnel ceiling is more significant.Compared with longitudinal ventilation,the maximum ceiling temperature rise under semi-transverse ventilation is obviously smaller,and the longitudinal attenuation of ceiling flue gas temperature is more obvious.A new empirical model of dimensionless maximum ceiling temperature rise and ceiling flue gas temperature longitudinal attenuation considering ventilation wind speed,effective ceiling height and fire source power is proposed.
tunnel firesemi-transverse ventilationeffective ceiling heightflue gas temperature
万方数据
维普
