圆柱形障碍物对2H_(2)+O_(2)+nAr预混气体的再起爆实验研究  

Experimental Study on Re-initiation of 2H_(2)+O_(2)+nAr Premixed Gas by Cylindrical Obstacle

作　　者：刘虎 李权 吕兆文[1] 王昌建 魏臻[3] 孙昊丞 LIU Hu;LI Quan;LV Zhaowen;WANG Changjian;WEI Zhen;SUN Haocheng(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,Anhui,China;Anhui International Joint Research Center on Hydrogen Safety,Hefei University of Technology,Hefei 230009,Anhui,China;Hefei Gocom Information&Technology Co.,Ltd.,Hefei 230088,Anhui,China;Engineering Research Center of Safety Critical Industrial Measurement and Control Technology,Ministry of Education,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]合肥工业大学安徽省氢安全国际联合研究中心,安徽合肥230009 [3]高科信息科技股份有限公司,安徽合肥230088 [4]合肥工业大学安全关键工业测控技术教育部工程研究中心,安徽合肥230009

出　　处：《高压物理学报》2023年第5期158-171,共14页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(12102117);中国博士后科学基金(2021M690848);安徽省重点研究与开发计划项目(2022h11020013)。

摘　　要：开展了不同反应活性的2H_(2)+O_(2)+nAr气相爆轰波与圆柱形障碍物相互作用的实验研究。通过在管道顶部布置压电式压力传感器记录压力到达时间,并以此计算爆轰波传播速度。采用纹影技术和烟迹法记录爆轰破坏到再起爆全过程的波系及胞格结构。结果表明:爆轰波在障碍物上游接触障碍物时会发生反射;越过障碍物后,在障碍物下游会发生衍射。爆轰波越过障碍物时,受障碍物尾部膨胀波的影响,爆轰波衰减解耦,但随着从圆柱形障碍物两侧绕过的衍射激波在障碍物后轴线和管道中心轴线处碰撞,继而发生马赫反射以及入射激波与下游管道壁面碰撞发生马赫反射,完成再起爆过程。直径较小的障碍物造成的爆轰波能量损失较少,其胞格爆轰波的再起爆距离随障碍物直径的减小而缩短。针对不同直径障碍物的实验结果均表明,随着初始压力升高,预混气体反应活性增加,爆轰的自持稳定性增强,从而削弱了障碍物几何尺寸的影响,有利于减弱爆轰的衰减并缩短再起爆距离。在所研究的障碍物几何尺寸下,通过测量爆轰再起爆距离,建立了不同比例Ar稀释下的2H_(2)+O_(2)在圆柱形障碍物后的再起爆距离与圆柱垂直间距及胞格尺寸的关系。In this paper,the interaction between 2H_(2)+O_(2)+nAr gas-phase detonation waves with different reactivities and cylindrical obstacles was investigated by experiments.Piezoelectric pressure sensors were flushed-mounted on the top wall of the channel to record pressure time histories,from which the detonation wave velocities were calculated.The schlieren technology and smoked foil technique were used to record the wave system and cellular structure of the whole process from detonation failure to re-initiation.The results show that the detonation wave will be reflected when it touches the obstacle,and diffraction will occur downstream of the obstacle after crossing the obstacle.When the detonation wave crosses the obstacle,it is attenuated and decoupled by the expansion wave at the tail of the obstacle,but Mach reflection occurs as the diffraction shock wave bypassing both sides of the cylindrical obstacle collides at the rear axis of the obstacle and the central axis of the channel,and Mach reflection occurs when the incident shock collides with the downstream channel wall,completing the re-initiation process.The obstacles with smaller diameters cause less energy loss of the detonation wave,and the re-initiation distances of the cell detonation wave shorten with the decrease of the diameters of the obstacles.The experimental results of obstacles of different diameters show that with the increase of initial pressure,the reactivity of the premixed gas increases and the stability of self-sustaining detonation increases,thereby weakening the influence of the geometric size of the obstacles,which is conducive to weakening the attenuation of detonation and shortening the re-initiation distance.Under the geometric dimensions of the obstacles experimented in this paper,the detonation re-initiation distance was measured,and the relationship of re-initiation distance of 2H_(2)+O_(2)after the cylindrical obstacle under different dilution ratios of Ar was established with the cylindrical vertical spacing and cell size.

关 键 词：爆轰波 氢能 圆柱形障碍物 衍射 再起爆 

分 类 号：O383[理学—流体力学]