Double Whole Road Tunnel Fire Temperature Field Of Numerical Simulation And Escape Conditions Research

Currently, frequent occurrences of road tunnel fire accidents greatly affect the personalsafety and bring huge damage to the structure of buildings in tunnel, which has broughtserious economic loss; therefore, the research of prevention on tunnel fire accident hasaroused people’s attention increasingly. Nowadays, with the highway traffic level improvingand the length of tunnel increasing, the single longitudinal ventilation system can not reachthe ventilation requirement. Double whole complementary ventilation system on the basis ofthe principle of air exchange can reach the requirement of today’s tunnel ventilation, whatmore, it can save the economic cost greatly by combination of ventilation of the two tunnel.So, the double whole complementary longitudinal ventilation system has been used inhighway tunnel ventilation system widely.The paper has derived equations of the fluid for two-hole complementary longitudinalventilation system by combining installation of double holes complementary longitudinalventilation system with the general control of the fluid equations, and done research ontemperature field during the time of fire taking place and personnel evacuation and rescue bynumerical simulation. By using the Fluent simulation software, on the basis of analysis ofgeneral fire combustion characteristics, premixed combustion model is selected to simulatethe combustion situation when fire took place in tunnel. It has simulated and analyzed thedistribution of temperature field when the tunnel is not ventilated and in proper ventilationby dividing the place of fire occurrence into three different situations that the fire occurred inthe left side of the left side of the ventilation system of the two-hole complementary, intransverse ventilation short track between the two-hole complementary ventilation system, inthe right side of the right side of the ventilation system of the two-hole complementary, andput forward the method of changing longitudinal ventilation air flow to control thehigh-temperature air flow to reduce the effects of fire when it took place: when the fireoccurred at the left side of the short-track of the left side of the ventilation system of thetwo-hole complementary transverse ventilation, reversed the short track fan of the left lateralventilation, and closed part of the fan at fire tunnel entrance; when the fire occurred in thetwo horizontal ventilation between the short-track double hole complementary ventilationsystem, turned off part of the fan at the fire tunnel inlet; when the fire broke out in the rightside of the transverse ventilation short track of the two-hole complementary ventilation,reversed part of the fan of the fire at the exit of the tunnel. And then through analysis thecurve of the temperature changing with distance in the fire tunnel when the times in1minutes,2minutes,5minutes,20minutes and the curve of the temperature changing withtime on different locations nearby the fire areas. Through calculated the personnelevacuation and fire rescue in the tunnel by three different situations as no longitudinalventilation, normal ventilation and take ventilation control. Based on contrast the personnelevacuation and fire rescue in the tunnel by three different situations，draw the most favorable of the personnel evacuation and fire rescue in the tunnel is the case during ventilation controlmeasures.