Smoke Control Of The Stair And The Vestibule Numerical Simulation In High-Rise Building

Building fire is a disaster that happens frequently and destroys almost everything. High-rise building fire is the most dangerous in all kinds of building fires. Smoke, which has high temperature, toxicity and asphyxiation, is the direct reason that causes fire casualties. Smoke control system to stop smoke spread to the evacuation access is so important, and that it can also ensure that people evacuate safely. Based on analyzing development of the vestibule's smoke control methods and mathematics principle of the net model and the field model, author adopts numerical simulation to analyze smoke movement, airflow and effect of the smoke control after running the smoke control system.The article first summarizes various smoke control methods of the vestibule in the high-rise buildings. Following, it reviews the domestic and international development and experimental achievements of the vestibule's smoke control methods and introduces in brief three mature numerical fire and smoke models: zone model, net model, and field model. Also introduction is made of conception, application conditions, functions, usage characteristics of multizone net model CONTAMW, even with mathematical theory for simulating airflow and contaminant transport. On the basis of consulting a large number of foreign documents, air leakage value range of typical building components are given. Then the article introduces in detail the mathematical theory of the field model, including finite volume method, SIMPLE arithmetic of field numeration, turbulent flow and its application and standard k ?εturbulent model. Then, the field model Airpak is recommended, also with the grid partition and the convergence standard. All these provide a basic for establishing and computing the model.Take a 20-story and 30-story high-rise building for example, there are analysis of the running characteristic of three pressurized methods. By changing the pressurized supply air rate, a multizone network model CONTAMW is used to simulate pressure difference on both sides of the door with all floors'door closed. And Airpak is used to simulate air velocity of the fire floor's door with three floors'door opening conditions. The result shows that the pressurized supply air rate has a significant effect on the pressure difference of both sides of the door and air velocity of the door especially the door of the fire floor. When...