Numerical Simulation Of Ship Engine-Room Fire And Personnel Escape In The Fire

At present, the research on personnel evacuation in building fire has relatively perfectand mature, but the research on ship fire and personnel evacuation in ship fire are still at theinitial stage. The research on ship fire and personnel evacuation in it has became the urgentneed about ship fighting design, with the ship’s increasing important role in social economy.So the research on ship fire and personnel evacuation has great significance.At the basic of the research project "ship engine room fire and fire mechanism", theauthor has made a further study about the smoke concentration field and temperature field inthe engine-room fire and their influence on personnel escape. The large eddy simulationturbulent flow model and social force model based on panic were used respectively tosimulate the fire developed process and personnel escape in a certain chemical tanker’sengine-room, when fire was occurred. To study the movement of personnel escape in shipfire, the mass and species transport equation, the energy transport equation and the gasequation of state, combined with the theorems such as chemical composition ofconservation, mass conservation of chemical elements, were used. The simulation resultsshowed that the escape velocity decreased with the increase of soot density (mg/m3), as aslope of-0.94×10-3and evacuees’ evacuative velocity decreased to0.7m/s from1.18m/s, byanalyzing the hot smoke’s influence on escape time and the degree of correlation betweensmoke density and escape velocity.The dangerous advent time and the available safe egress time were analyzed，throughconsidering fire detection time and the response time of people to the fire. The calculatedresults showed that the fire detective time was60seconds, the response time of people tothe fire was normal distribution between10and20(reference from the response time ofpersonnel in industrial workshop fire). And that means the time when the person begin toescape was70~80s. At the same time, we obtained the dangerous advent time was195s, byanalyzing the distribution of CO2concentration, CO concentration and temperature inengine room.Finally, the problem of cabin structure and equipment arrangement was proposedaccording to the calculated Results, and it provide important reference basis for thearrangement and optimizing of similar chemical tanker cabin structure.