Study Of Subway Fire And Smoke Simulations

With expeditiously development of national economy, constructions of under- ground are becoming more important. Due to the increase of underground quantity all over the country, fatalness of fire in every underground are increasing gradually. Therefore, ventilation in a fire emergency in a underground becomes extremely important. Until now, our investigation and research in this field is far behind abroad, and is badly hindering the underground construction.Now, there are more and more underground in practice, so we should investigate underground which had been established to accumulate our experience in fire emergency. And it is essential that we should find out the effective and available scenario of fire ventilation to control the air velocity in underground exceeding the "critical velocity" and push all of the smoke out f the tunnel. The work here has a lot of application and stringency.For the first time, the various ventilation methods and effects to control the smoke in a fire emergency the underground are presented. With the hypothesis of one-dimensional steady ideal fluid, the experimental and numerical are presented. Computational Fluid Dynamics, that is CFD, techniques are used to study and understand fluid behavior in underground. By simulating complex specific operation cases, we can educe velocity or flux distribution and determine the favorable operational procedures of Beijing underground ventilation in several fire case. Comparison has been made between a simulation and experiment for some cases in order to prove the CFD model is powerful, so that enables the study of cases for which simulated data is available. The analysis of results is also valuable for researching and operating of other underground ventilation.