圆柱形障碍物对2H2+O2+nAr预混气体的再起爆实验研究

刘虎 李权 吕兆文 王昌建 魏臻 孙昊丞

刘虎, 李权, 吕兆文, 王昌建, 魏臻, 孙昊丞. 圆柱形障碍物对2H2+O2+nAr预混气体的再起爆实验研究[J]. 高压物理学报, 2023, 37(5): 055202. doi: 10.11858/gywlxb.20230672
引用本文: 刘虎, 李权, 吕兆文, 王昌建, 魏臻, 孙昊丞. 圆柱形障碍物对2H2+O2+nAr预混气体的再起爆实验研究[J]. 高压物理学报, 2023, 37(5): 055202. doi: 10.11858/gywlxb.20230672
LIU Hu, LI Quan, LV Zhaowen, WANG Changjian, WEI Zhen, SUN Haocheng. Experimental Study on Re-initiation of 2H2+O2+nAr Premixed Gas by Cylindrical Obstacle[J]. Chinese Journal of High Pressure Physics, 2023, 37(5): 055202. doi: 10.11858/gywlxb.20230672
Citation: LIU Hu, LI Quan, LV Zhaowen, WANG Changjian, WEI Zhen, SUN Haocheng. Experimental Study on Re-initiation of 2H2+O2+nAr Premixed Gas by Cylindrical Obstacle[J]. Chinese Journal of High Pressure Physics, 2023, 37(5): 055202. doi: 10.11858/gywlxb.20230672

圆柱形障碍物对2H2+O2+nAr预混气体的再起爆实验研究

doi: 10.11858/gywlxb.20230672
基金项目: 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)
详细信息
    作者简介:

    刘 虎(1998-),男,硕士研究生,主要从事气体爆轰研究.E-mail:2021110590@mail.hfut.edu.cn

    通讯作者:

    李 权(1991-),男,博士,副教授,主要从事气相爆轰传播动力学研究. E-mail:quanli@hfut.edu.cn

  • 中图分类号: O383

Experimental Study on Re-initiation of 2H2+O2+nAr Premixed Gas by Cylindrical Obstacle

  • 摘要: 开展了不同反应活性的2H2+O2+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2H2+O2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。

     

  • 图  实验系统装置示意图

    Figure  1.  Schematic diagram of experimental facilities

    图  不同直径障碍物下的上、下游平均速度与初始压力的关系

    Figure  2.  Upstream and downstream average velocity versus initial pressure in the cases of various diameter obstacles

    图  障碍物直径d=17.5 mm时快速火焰在不同初始压力下的传播烟迹

    Figure  3.  Smoked foils of the propagation pattern of fast flame at different initial pressures at obstacle diameter d=17.5 mm

    图  障碍物直径d=17.5 mm、不同初始压力下压力传感器P1、P2、P3、P4处的压力曲线

    Figure  4.  Pressure profiles at pressure sensor P1, P2, P3, P4 under different initial pressures at obstacle diameter of 17.5 mm

    图  快速火焰在不同直径障碍物、不同初始压力下的传播烟迹

    Figure  5.  Smoked foils of the propagation pattern of fast flame in obstacles with different diameters and different initial pressures

    图  前导激波、CJ爆轰撞击直径d=17.5 mm的圆柱形障碍物时下游纹影照片

    Figure  6.  Schlieren shots of leading shock or CJ detonation colliding with the cylindrical obstacle diameter of 17.5 mm

    图  入射爆轰波与柱形障碍物碰撞结构示意图

    Figure  7.  Schematic diagram of the collision structure of the incident detonation and the cylindrical obstacle

    图  障碍物直径d=17.5 mm时不同初始压力下再起爆胞格图像

    Figure  8.  Smoked re-initiation foils downstream of the cylindrical obstacle with the diameter of 17.5 mm under different initial pressures

    图  越过不同尺寸圆柱形障碍物后2H2+O2Lre/Dh/λ的关系

    Figure  9.  Relationship between the Lre/D and h/λ of 2H2+O2 after crossing cylindrical obstacles of different sizes

    图  10  障碍物直径d=17.5 mm时Ar对再起爆距离的影响

    Figure  10.  Effect of Ar on the re-initiation distance with the obstacle diameter of 17.5 mm

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出版历程
  • 收稿日期:  2023-05-30
  • 修回日期:  2023-06-16
  • 录用日期:  2023-07-20
  • 网络出版日期:  2023-10-16
  • 刊出日期:  2023-11-07

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