Numerical Simulation of Dense Maize Starch-Dust Explosions in Open Air

摘要：

　　Dust explosion still represent a constant threat to process industries.Numerical simulations of dense-dust explosions in open air were performed to study the pressure field and temperature field.Using compressible numerical method for fluid dynamics and Eulerian-Eulerian approach for multiphase model,this paper made some improvements on submodels of dust explosion, including water evaporation model and char combustion model.Two circumstances were considered: dust with different water content (5%, 10%, 15% and 20%) and dust with different radius (400μm, 450μm and 500μm).In the simulations, the computational domain was 20m long and 10m high and an initial gradually variational high-temperature field triggered the explosion.Results show that temperature and overpressure both decline with the increase of water content.And the high-temperature area propagates rapidly.Temperature in explosions of dust with radius ranging from 400μm to 500μm decline while overpressure and negative pressure increase.Besides, overpressure and negative pressure in finer dust case oscillates more, which will trigger secondary explosions more easily.And this oscillations denote that they can stimulate each other.

关键词： dense dust explosion Numerical Simulation eulerian-eulerian approach temperature field pressure field

作者: CHEN Changkun LEI Peng LIU Xuanya

作者单位: School of Civil Engineering, Central South University, Changsha410075, Hunan, China;Key Laboratory o School of Resources and Safety Engineering, Central South University, Changsha410083, Hunan, China Key Laboratory of Building Fire Protection Engineering and Technology of MPS, Tianjin300381, China

会议类型: 国际会议

会议名称: The 2016 International Symposium on Safety Science and Technology(2016安全科学与技术国际会议)

会议地点: 昆明

会议语种:英文

页码: 588-596

在线出版日期: 2016-10-17（万方平台首次上网日期，不代表论文的发表时间）