The Application Research About Jet Fans In Smoke Control Of Underground Car Park

Jet fans have been widely used in the tunnel longitudinal ventilation system.In recent years, jet fan smoke exhaust system design has been used in theunderground car parks and large spaces and become hot spot. Through theanalysis of the scholars, compared with the traditional design concept, jet fanimpulse system can solve problem about underground car park storey’s heightand smoke exhaust efficiency, because of it do not need to install the pipelinesand smoke efficiency is high.The article has researched and analyzed the development situation aboutthe smoke control system of underground parking lot, research situation aboutjet fan system at home and abroad，situation about CFD simulation in jet fansmoke control system. The research method of performance-based fireprotection design to research the fire safety of jet fan impulse system in theunderground car parks was put forward．According to the test data of DA-1jet fan velocity fields, by comparison with the velocity fields with CFD simulation results, jet fan speed fields of CFDsimulation was feasible. The simplified methods to build the jet fan and to setthe boundary conditions were obtained. The research results were important forthe simulation research of underground car park smoke control system design.According to the jet fan model and smoke movement characteristics, jetfans were preliminarily arranged. Building CFD model, the boundary conditionsand grid parameters were analyzed carefully. The method of theperformance-based fire protection design was applied to analyzing influencefactors about jet fan impulse system and put forward simulation analysissuggestions. Through the simulation analysis to reduce mechanical smokeexhaust quantity and to realize the optimization of jet fan system design.Compared with simulation results of the traditional smoke control system withthe jet fan impulse system, their respective advantages and disadvantages andapplicability were analyzed.