Citation

Yang J, Shao Z, Chen X. China Saf. Sci. J. 2019; 29(2): 69-75.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.02.012

PMID

unavailable

Abstract

The impact of ventilation on detection of fire in an aircraft cargo compartment was studied by using a fire dynamics simulator (FDS) to dynamically simulate the smoke diffusion in the cargo compartment under different ventilation conditions. First, a three-dimensional numerical model was built for the DC-10 cargo compartment to simulate the ceiling temperature, gas concentration and LT during ventilation. The model was verified.Then, the smoke flow field and LT of smoke under the ceiling under five ventilation conditions were calculated to study ventilation effect on the detection time at different locations. And the influence of the detector threshold on the detection time was further analyzed. The results show that the ventilation significantly affects the diffusion of smoke in the cargo compartment compared to the non-ventilated condition, that the smoke is easily detected downstream of the venting port, that the ventilation delays the smoke detection time and the stronger the ventilation is, the longer the response time will be, so when the ventilation is stronger than 11. 33 m3 / min, no smoke is detected, and that the smoke meter threshold affects the detection time, and increasing the detector threshold and reducing the ventilation appropriately can shorten the detection time. © 2019 China Safety Science Journal. All rights reserved.

Language: zh