Propagation Characteristics of Gas Explosion in Linked Vessels Based on DDT Criteria |
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Institution: | 1. School of Civil Engineering, Hefei University of Technology, Hefei, Anhui 230009, China;2. Anhui International Joint Research Center on Hydrogen Safety, Hefei, 230009, China;3. Engineering Research Center of Safety Critical Industrial Measurement and Control Technology, Ministry of Education, China;1. East China University of Science and Technology, Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai, 200237, China;2. Beijing Institute of Technology, State Key Laboratory of Explosion Science and Technology, Beijing, 100081, China |
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Abstract: | To study the occurrence conditions and propagation characteristics of deflagration to detonation transition (DDT) in linked vessels, two typical linked vessels were investigated in this study. The DDT of the methane–air mixture under different pipe lengths and inner diameters was studied. Results showed that the CJ detonation pressure of the methane–air mixture was 1.86 MPa, and the CJ detonation velocity was 1987.4 m/s. Compared with a single pipe, the induced distance of DDT is relatively short in the linked vessels. With the increase in pipeline length, DDT is more likely to occur. Under the same pipe diameter, the DDT induction distance in the vessel–pipe–vessel structure is shorter than that in the vessel–pipe structure. With the increase in pipeline diameter, the length of the pipe required to form the DDT is reduced. For linked vessels in which detonation formed, four stages, namely, slow combustion, deflagration, deflagration to detonation, and stable detonation, occurred in the vessels. Moreover, for a pipe diameter of 60 mm and a length of 8 m, overdriven detonation occurred in the vessel–pipe–vessel structure. |
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Keywords: | Gas explosion DDT Criteria Pipe length Pipe diameter Linked vessels |
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