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论文类型：期刊论文

发表时间：2012-07-01

发表刊物：APPLIED THERMAL ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：40

页面范围：337-342

ISSN号：1359-4311

关键字：Deflagration; Numerical simulation; Flame speed; Pressure rise rate; Length to diameter ratio

摘要：A three-dimensional numerical model in which the heat loss through pipe walls was included was developed to simulate gaseous deflagration in pipes of large length to diameter ratio (L/D). The simulated pressure time histories are in good agreement with published data, and the error between experimental and computed maximum pressure is less than 15.3%. The attention is focused on the flame propagation and flow field during deflagrations, as well as the effects of ignition point (at the center or at one end of the pipe) and L/D (L/D = 6 - 10.35) of the pipe on them. The numerical results show that a tulip flame is formed during flame propagation, which is related to the reverse flow and vortices motion. The maximum fame speed is 30% higher with the ignition point at the end than that at the center, and it increases linearly with increasing L/D. The deflagration pressure decreases when the distance that flame travels increases due to the effect of the heat loss through pipe walls. (C) 2012 Elsevier Ltd. All rights reserved.