Study On Optimal Control Technology Of Induced Ventilation In The Tunnel

The way use the induced jet fans for ventilation of tunnels or smoke control andextraction in the tunnel is vertical ventilation. In recent years, it has been more widespreadapplication in the world. The pressure rise, installation location of the jet fan, fan of both thecomposition and arrangement all play a key role in exhaust ventilation of the tunnel.Therefore, this paper use FDS to optimize the simulation of the model of tunnel inducedventilation exhaust system and determine the tunnel induced optimization arrangement of theventilation system.In this paper, the subway tunnel ventilation system model was established by FDS andthe velocity field in the tunnel were simulated and analyzed. The comparative analysis ofresults of numerical simulation and measured data identified two key parameters of FDSmodel boundary conditions.This paper use FDS to build a tunnel ventilation system model and select the six modelsof jet fans by calculating the tunnel ventilation pressure ventilation.Under the simulationconditions of the middle of a typical model jet fan tied in each of two fans and three fans ineach tied, the fans’ parallel lateral space was converted with the diameter of fans. When thearrangement of two fans in each, the parallel lateral space is three fans’ diameter; whenarranged in each of three fans, the parallel lateral space is two fans’ diameter.With numerical simulation calculation of tunnel cross-section by the speed and pressuredistribution variation, a variety of jet fans in the whole hybrid ventilation conditions andhybrid ventilation induce were simulated and minimum longitudinal spacing of the windturbine installation was identified under various conditions.Under fire conditions in the tunnel, three typical types of wind turbines were used tooptimize the layout simulation under a variety of combination conditions. Throughcomparative analysis of the speed distribution and visibility in the tunnel, the same conclusionthat the optimal combination arrangement is the fan arranged in each single was made. Inaddition, the jet fans arranged in the relay type is superior to concentrate arranged in thetunnel entrance, the former can quickly reduce the concentration of smoke in the tunnel tomeet the evacuation needs.