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针对端部开口短管气体爆燃火焰传播问题,通过借鉴Clanet和Bychkov提出的火焰传播模型,在假设绝热、可不压缩的条件下,得到了可燃气体分布与火焰锋面传播的数学模型。以汽油蒸汽为实验工质,在全透明实验管道上进行了爆燃实验。通过高速摄影及纹影图像,对所提出的模型进行了验证。结果表明,该模型能够较准确地预测长径比4:1至10:1的端部开口短管气体爆燃外场可燃气体界面与火焰锋面位置。上述成果将原有理论拓展到外场计算,在可燃气防爆安全设计等领域具有一定应用价值。
Aiming at the flame propagation problem of open-ended short-bellows gas explosion, a mathematical model of combustible gas distribution and flame front propagation is obtained by using the flame propagation model proposed by Clanet and Bychkov under the assumption of adiabatic and uncompressed conditions. Taking gasoline vapor as experimental working medium, deflagration experiment was conducted on a totally transparent experimental pipe. The proposed model was validated by high-speed photography and imagery. The results show that the model can accurately predict the flammable gas interface and the flame front position of open-ended short-bellows gas explosions with an aspect ratio of 4: 1 to 10: 1. The above results extend the original theory to field calculation and have certain application value in the field of combustible gas explosion-proof safety design.