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Volume 37 Issue 5
Nov 2023
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Chinese Journal of High Pressure Physics  > 2023  >  37(5): 055202.
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
shu

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

doi: 10.11858/gywlxb.20230672
  • 1.

    School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China

  • 2.

    Anhui International Joint Research Center on Hydrogen Safety, Hefei University of Technology, Hefei 230009, Anhui, China

  • 3.

    Hefei Gocom Information & Technology Co., Ltd., Hefei 230088, Anhui, China

  • 4.

    Engineering Research Center of Safety Critical Industrial Measurement and Control Technology, Ministry of Education, Hefei University of Technology, Hefei 230009, Anhui, China

  • Received Date: 30 May 2023
  • Rev Recd Date: 16 Jun 2023
  • Accepted Date: 20 Jul 2023
    • Available Online: 16 Oct 2023
  • Issue Publish Date: 07 Nov 2023
    Abstract
  • In this paper, the interaction between 2H2+O2+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 2H2+O2 after the cylindrical obstacle under different dilution ratios of Ar was established with the cylindrical vertical spacing and cell size.

     

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