Jet Fan Exhaust Research In Undearground Garage

Underground parking field belongs to the relatively closed underground confined space and its internal characteristics is large area and multi pipeline and level; the characteristics of fire safety is fire burning speed, high temperature smoke resulted in low visibility, prone to flashover and the formation of the explosion of adverse consequences, the parking lot at the top of the building damage. Traditional pipe type exhaust outlet limited arrangement, exhaust effect is not ideal shortcomings. In this paper, We are looking for a way to replace the traditional pipeline type ventilation mode.The according to the jet fan ventilation effect induced, this method can effectively save space, effectively reducing storey building, reduce the construction cost. Because there is no domestic jet fan auxiliary exhaust standard, this paper in reference to Singapore, the United Kingdom and other specification based, combined with China’s underground garage fire protection design requirements, and explore the application of jet fan assisted ventilation in the underground parking.The main contents of this paper include:(1) jet theory summary analysis, it is concluded that when the jet fan assisted ventilation. Jet fan is located on the top floor, is attached to clothing jet, the typhoon machine arranged in an array type can jet fan superposition theory is used to calculate.(2) for fan arranged in an array type flow field test, the test of Typhoon aircraft and two typhoon machine parallel flow field distribution and verify the applicability of the theory of jet in the underground space.(3) in the garage of hot smoke test of jet fan for fume exhaust auxiliary effect. The result is used to validate the numerical simulations of the model is correct,.(4) for numerical simulation, simulation of the big fire, jet fan auxiliary exhaust fan arrangement of fan types and garage make up air exhaust fan inside the garage smoke exhaust effect and temperature field, draws the conclusion. According to the simulation results, the tactics of applying the jet fan to the smoke extraction in the underground garage is put forward..Research shows that: when the underground garage application of jet fan assisted ventilation. Jet fan can be selected outlet wind speed greater than 8m / s wind machine, fan using rectangular array, fan vertical and horizontal alignment distance can be calculated according to the formula of jet. The exhaust fan in the garage can be set according to the air exchange rate of the 12 /h..