Influence of Smoke Outlet Orientation on Smoke Exhaust Effect in Underground Garage

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Influence of Smoke Outlet Orientation on Smoke Exhaust Effect in Underground Garage

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[1]ZHONG Wei,TIAN Ying,HAN Ning,et al.Influence of Smoke Outlet Orientation on Smoke Exhaust Effect in Underground Garage[J].Journal of Zhengzhou University (Engineering Science),2022,43(05):84-90.[doi:10.13705/j.issn.1671-6833.2022.05.010]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43卷 Number of periods: 2022 05 Page number: 84-90 Column: Public date: 2022-08-22

Title:: Influence of Smoke Outlet Orientation on Smoke Exhaust Effect in Underground Garage

Author(s):: ZHONG Wei¹; TIAN Ying¹; HAN Ning¹; GAO Zihe²; ZHANG Heng¹; 1.School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China;
2.School of Civil Engineering， Zhengzhou University， Zhengzhou 450001， China

Keywords:: underground garage fire; mechanical exhaust; smoke exhaust vent; exhaust efficiency

CLC:: N39；TU962；TU926

DOI:: 10.13705/j.issn.1671-6833.2022.05.010

Abstract:: In order to examine the smoke exhaust effect of three mechanical smoke exhaust systems with different smoke outlet orientations, an FDS physical model was established by taking a smoke prevention zone of the car garage, and numerical simulations were carried out for the three smoke extraction systems. The flow field, temperature distribution, as well as the heat exhaust and smoke exhaust efficiency of the three smoke exhaust systems were compared. The characteristics of the three smoke extraction systems and the differences in the smoke exhaust effect were analyzed. The results showed that, from the perspective of flow field and temperature distribution, the flow field distribution of the three smoke extraction systems was quite different, but the temperature distribution was very similar. From the perspective of smoke exhaust efficiency and heat exhaust, the mechanical smoke exhaust system with the exhaust port upward was about 4% higher in the exhaust efficiency and about 10% higher in the heat exhaust than the system with the opening downward. From the perspective of the change of exhaust heat when the height of the exhaust port was different, for the smoke exhaust system with the downward opening, the heat exhaust increased significantly with the increase of the height of the exhaust port, while the smoke exhaust system with the upward opening, the heat exhaust increased not obviously with the increase of the height of the exhaust port. For the smoke exhaust system with the upward opening, when the height of the exhaust outlet was lower than 4.5 m, the smoke exhaust efficiency increased gradually with the increase of the upward height of the smoke exhaust outlet. However, when the height of the exhaust outlet exceeded 4.5 m, the smoke exhaust was disturbed by the ceiling due to the short distance between the smoke exhaust outlet and the ceiling, which led to the smoke exhaust efficiency reduced.

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Last Update: 2022-08-23