填充密度对球形非金属隔片抑制丙烷爆炸性能的影响  

Influence of Packed Densities of Nonmetallic Spherical Spacers on Propane Explosion Suppression

作　　者：刘乐海 毕凤荣[1] 于洋洋 张俊红[1,2] 孟祥德[3] 张学玲 LIU Le-hai;BI Feng-rong;YU Yang-yang;ZHANG Jun-hong;MENG Xiang-de;ZHANG Xue-ling(State Key Laboratory of Engine,Tianjin University,Tianjin 300072,China;Renai College,Tianjin University,Tianjin 301636,China;Tianjin Jieqiang Power Equipment Co.,Ltd,Tianjin 300410,China)

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]天津大学仁爱学院,天津301636 [3]天津捷强动力装备股份有限公司,天津300410

出　　处：《含能材料》2021年第9期840-847,I0007,共9页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金资助(2140316)。

摘　　要：为了研究球形非金属隔片填充密度与其抑制丙烷爆炸性能的关系,利用自主设计的定容燃烧弹并结合高速纹影技术,在不同丙烷⁃空气当量比(1、1.5、2)下,对不同球形非金属隔片填充密度(21.9,38.7,45.1 kg·m^(-3))下的丙烷⁃空气预混气体进行爆炸试验。分析了不同丙烷⁃空气当量比下,球形非金属隔片的填充密度对缸内最大爆炸压力、热损失、火焰尖端速度、火焰传播特征以及湍流的影响。结果表明:球形非金属隔片对丙烷爆炸压力有抑制作用,但对火焰传播过程有促进作用;球形非金属隔片填充密度为45.1 kg·m^(-3)时,各个丙烷⁃空气当量比下缸内最大爆炸压力降低率与热损失均达到最大,火焰尖端速度峰值和两点之间最大速度差以及湍流增强系数相对较小,抑爆效果最好。To study the correlation between the packed density of nonmetallic spherical spacers(NSS)and its suppression of pro⁃pane explosion,a newly designed constant⁃volume combustion cylinder combined with high⁃speed schlieren photography was employed.The explosion experiments of propane⁃oxygen pre⁃mixtures with different equivalence ratios(1,1.5 and 2)were con⁃ducted in cylinders with different packed densities of NSS(21.9 kg·m^(-3),38.7 kg·m^(-3) and 45.1 kg·m^(-3)).The effect of packed den⁃sities of NSS on maximum explosion pressures,total heat loss,flame tip velocities,flame propagation characteristics and turbu⁃lence in cylinders with different equivalence ratios of propane⁃oxygen were analyzed in detail.The results show that NSS has sup⁃pression effect on the maximum explosion pressure,and has promotion effect on the flame propagation process.When the packed density of NSS is 45.1 kg·m^(-3),the maximum explosion descending rate and heat loss in cylinders reach maxima,while the peak flame tip velocity,the maximum tip velocity difference between two points and the turbulence enhancement factor in cylinders are relatively small,which indicates the best explosion suppression performance of NSS.

关 键 词：球形非金属隔片 填充密度 丙烷⁃空气当量比 抑爆效果 

分 类 号：TK16[动力工程及工程热物理—热能工程]