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Title: Influence of Ventilation Factor on Smoke Control through Shaft in High-rise Building Fire // Proceedings of the Ninth International Seminar on Fire and Explosion Hazards. Vol. 1: 21-26 April 2019, Saint Petersburg, Russia
Creators: Li Y.; Sun H.; Shan X.; Chow W. K.
Organization: University of Science and Technology of China; The Hong Kong PolyU
Imprint: Saint Petersburg, 2019
Collection: Общая коллекция
Document type: Article, report
File type: PDF
Language: English
DOI: 10.18720/SPBPU/2/k19-76
Rights: Свободный доступ из сети Интернет (чтение, печать, копирование)

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Stack effects have an important influence on smoke movement in high-rise buildings. The stack effect in a room with a shaft causes a negative pressure condition in the room. Smoke can be extracted out of the room through the shaft and fresh air will enter the room through inlet openings. The flow through the inlet may be unidirectional or bidirectional. So, the smoke may also flow out of the room from the inlet for some conditions. The design of the inlet is important to prevent smoke from flowing out. The ventilation factor is a basic parameter to study compartment fires. In this paper, a theoretical analysis was developed to obtain a critical ventilation factor to prevent smoke to overflow from the fire room through an inlet. Numerical simulations with different ventilation factors were also conducted to verify the theoretical model. The results showed that a negative pressure was generated at the bottom of the shaft. The magnitude of the negative pressure difference increased with increasing ventilation factor. However, the negative pressure difference increased at a low rate only within a narrow range of ventilation factors. The magnitude of the negative pressure induced at the opening for supplying air decreased with increasing ventilation factor. At some point, the pressure inside the room was even higher than that outside for some ventilation factors. Consequently, smoke moved out of the fire room through the air-supply opening under a larger ventilation factor. This result illustrated that there is a critical value for the ventilation factor. When the ventilation factor is less than this critical value, there is no smoke flow out of the room. The critical value of ventilation factor was calculated using the theoretical model and verified by numerical simulations.

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