化工学报2019，Vol.70Issue(3)：1227-1235,9.DOI:10.11949/j.issn.0438-1157.20181072
密闭空间内聚乙烯粉尘爆炸火焰传播特性的实验研究
Experimental study on flame propagation characteristic of polyethylene dust explosion under confined chamber
摘要
Abstract
An experimental apparatus which could withstand high pressure and with good visibility was modified.PIV technology was applied to measure the distribution of cold pulverized flow field. Flame propagation characteristics of polyethylene dust explosion were investigated in closed vessel. In experiments, flame structure, flame brightness, flame front location, flame propagation speed and other parameters variation were analyzed. The results show that in the concentration range of 200-1000 g/m3, the low-concentration polyethylene dust explosion flame has a discontinuous fin-like structure, and the flame front is discrete star-shaped. On further increasing the dust concentration the flame continuity as well as the luminance increased and reached the top at the concentration of 400 g/m3. The velocity fluctuated obviously during the flame propagation process of polyethylene dust explosion at different concentrations, which increased at first and then decreased. The velocity-fluctuation of the flame was more obvious when it was close to the optimum explosion concentration range. The RMS turbulent velocity equation was adopted to quantify overall pulsation amplitude. Dust concentration was close to the optimal explosion concentration of 400 g/m3 and the RMS turbulent velocity was 3.21 m/s.关键词
密闭空间/粉体/湍流/爆炸/火焰结构/火焰传播速度Key words
confined space/powders/turbulent flow/explosions/flame structure/flame propagation velocity分类
资源环境引用本文复制引用
喻健良,侯玉洁,闫兴清,纪文涛,于小哲,王祎博..密闭空间内聚乙烯粉尘爆炸火焰传播特性的实验研究[J].化工学报,2019,70(3):1227-1235,9.基金项目
国家自然科学基金项目(51574056,51604057) （51574056,51604057）
