扩散时间对乙烯-空气燃爆特性的影响  

Effect of Diffusion Time on Deflagration and Detonation Parameters of Ethene-Air

作　　者：杨理[1] 饶国宁[1] 解立峰[1] 王永旭[1] 彭金华[1] 

机构地区：[1]南京理工大学化工学院安全工程系,江苏南京210094

出　　处：《高压物理学报》2015年第5期369-376,共8页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金青年基金(11102091);教育部博士点基金(20113219110010)

摘　　要：为探究在有限空间中,初始压力为0.25MPa、两处乙烯气体瞬时源在不同扩散时间下的燃爆特性,在内径200mm、高5 400mm的立式激波管中,采用上下进气方式,在强起爆条件下,测定5个不同扩散时间下3种浓度的乙烯-空气混合气体(C2H4-Air)的燃爆参数。实验结果表明,扩散时间大于1h后,3种浓度的C2H4-Air混合气体燃爆参数趋于一致。4.00%(体积分数)C2H4-Air在当前实验条件下未能达到爆轰。6.67%C2H4-Air在5个扩散时间均可达到爆轰,扩散时间为1h时的爆压、爆速分别为4.24 MPa、1 719m/s。8.89%C2H4-Air在0.08h扩散时间下只发生爆燃,扩散时间为0.5h及以上发生爆轰,扩散时间为1h时的爆压、爆速分别为4.31 MPa、1 813m/s。通过烟熏技术捕捉到6.67%、8.89%的C2H4-Air混合气体的爆轰波胞格,胞格宽度分别为8.22、14.15mm,长宽比分别为1.44、1.57。A vertical shock tube of 200 mm in inner diameter and 5 400 mm in height was used to study the deflagration and detonation parameters of ethane-air mixtures under a high initial pressure（0.25 MPa）.The gas mixtures flow into the shock tube through two inlets at two ends of the shock tube instantaneously,the experiments of 3concentrations of mixtures and 5diffusion times were carried out with high initiation energy.The experimental results show：when the diffusion time exceeds 1h,the trends of the deflagration-detonation parameters of C2H4-Air for 3concentration are similar;4.00%（volume fraction）C2H4-Air cant meet the detonation criteria under the experiment condition;6.67%C2H4-Air can be ignited at 5diffusion times,the detonation pressure and velocity separately are 4.24 MPa and 1719m/s when the diffusion time is 1h;8.89%C2H4-Air deflagrates when the diffusion time is 0.08 h,the detonation pressure and velocity separately are 4.31 MPa and 1 813m/s when the diffusion time is 1h;We seized the detonation cell size of 6.67%,8.89%C2H4-Air by smoked foil,the width separately are 8.22 and 14.15 mm,L/λseparately are 1.44 and 1.57.

关 键 词：气相爆轰 扩散时间 爆轰参数 立式激波管 直接起爆 胞格 

分 类 号：O384[理学—流体力学]