Experimental Study on Smoke Exhaust Effect by Using Jet Fans in an Underground Garage

摘要

In order to research the technical feasibility and influence factors of impulse ventilation systems in an underground garage, full-scale fire tests have been designed and conducted. Four testing conditions have been designed by changing jet fan combination form and opening time. The temperature and smoke layer at different distances from the fire source have been recorded. Results show that jet fan would drive smoke to the downstream exhaust port more quickly and visibility of fire source upstream would be increased. There is a significant change on smoke exhaust of jet fan combination. Series arrangement of jet fan would keep smoke layer temperature stable and smoke could be exhausted effectively. However, series-parallel combination of jet fans could cause a high fluctuation in smoke layer temperature. It would do harm to exhaust smoke quickly in garage.