Consequence analysis of premixed flammable gas explosion occurring in pipe using a coupled fluid-structure-fracture approach |
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| Institution: | 1. Center for Offshore Equipment and Safety Technology, China University of Petroleum, Qingdao, 266580, China;2. College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, China;3. Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, China;4. Institute of Solid Mechanics, Zhejiang University of Technology, Hangzhou, 310014, China;1. State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, 266590, China;2. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061, China;1. Center for Offshore Equipment and Safety Technology, China University of Petroleum, Qingdao 266580, China;2. College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China;3. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China;4. Institute of Solid Mechanics, Zhejiang University of Technology, Hangzhou, 310014, China;1. Department of Safety Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China;2. College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China;3. Institute of Solid Mechanics, Zhejiang University of Technology, Hangzhou 310014, China;4. Center for Offshore Equipment and Safety Technology, China University of Petroleum (East China), Qingdao 266580, China;1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;2. Process Safety Consultant, Cincinnati, OH, USA |
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| Abstract: | A coupled fluid-structure-fracture approach incorporating a high-efficiency detonation modeling algorithm was proposed to study the consequences of premixed flammable gas explosion occurring in pipe. A strain-rate-dependent failure criterion which is the vital prerequisite for accurate consequences prediction was derived based on the failure mechanism of materials at high strain rates and it was applied to account for the fracture of pipe. The simulated pressure time history and fracture patterns were validated against experimental results and good agreements were acquired. The interaction between detonation wave and pipe during crack extension, dynamic fracture processes of pipes with different initial flaws, venting features of detonation products and pressure profiles out of pipe were obtained and discussed in detail. The comparison with existing semi-empirical and CFD methods was performed and it is revealed that the deformation and fracture of pipe have obvious negative influences on the peak overpressure and the rate of pressure increase out of pipe. Because the energy absorption and dissipation due to structural deformation and fracture are well taken into account, the coupled fluid-structure-fracture method is expected to provide more rational consequences prediction and analysis results. |
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| Keywords: | Gas explosion Structural deformation and fracture Fluid-structure interaction Consequence analysis |
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