扰动作用下爆轰形成机理

张静雯 彭澳 陈先锋 孙绪绪

张静雯, 彭澳, 陈先锋, 孙绪绪. 扰动作用下爆轰形成机理[J]. 高压物理学报, 2022, 36(6): 062303. doi: 10.11858/gywlxb.20220600
引用本文: 张静雯, 彭澳, 陈先锋, 孙绪绪. 扰动作用下爆轰形成机理[J]. 高压物理学报, 2022, 36(6): 062303. doi: 10.11858/gywlxb.20220600
ZHANG Jingwen, PENG Ao, CHEN Xianfeng, SUN Xuxu. Mechanisms of Detonation Initiation under the Effect of Perturbation[J]. Chinese Journal of High Pressure Physics, 2022, 36(6): 062303. doi: 10.11858/gywlxb.20220600
Citation: ZHANG Jingwen, PENG Ao, CHEN Xianfeng, SUN Xuxu. Mechanisms of Detonation Initiation under the Effect of Perturbation[J]. Chinese Journal of High Pressure Physics, 2022, 36(6): 062303. doi: 10.11858/gywlxb.20220600

扰动作用下爆轰形成机理

doi: 10.11858/gywlxb.20220600
基金项目: 国家重点研发计划(2021YFB4000901);中央高校基础研究项目(223161001);中国民航大学民航热灾害防控应急重点实验室开放基金(RZH2021-KF-05);中国科学技术大学火灾科学国家重点实验室开放基金(HZ2022-KF09)
详细信息
    作者简介:

    张静雯(1997-),女,硕士研究生,主要从事火焰加速研究. E-mail:303372@whut.edu.cn

    通讯作者:

    孙绪绪(1994-),男,博士,副研究员,主要从事气相爆轰传播动力学研究.E-mail:xuxusun@whut.edu.cn

  • 中图分类号: O381

Mechanisms of Detonation Initiation under the Effect of Perturbation

  • 摘要: 为详细研究扰动作用下爆轰触发机理,在内径为90 mm的圆管内用阻塞比为0.923的孔板使稳定爆轰完全失效,然后在孔板下游0.5 m处安装一个由直径为2 mm的圆柱杆构成的小型障碍物,用以研究人为添加的小扰动对不稳定爆轰触发的影响。通过改变小型圆柱杆的数量(1、2、3),得到了3种不同类型的小扰动,其阻塞比分别为0.03、0.04和0.07。采用PCB压力传感器记录爆轰波的到达时间,以获得爆轰平均传播速度,同时采用烟熏板技术记录爆轰胞格结构。实验结果表明:小扰动可显著促进爆轰起爆,爆轰触发临界压力从光滑管道内的37 kPa降低到25 kPa;小扰动还增强了波阵面的不稳定性,诱导形成局部爆炸点,这是导致爆轰触发的重要原因;在极限条件下,爆轰触发条件可近似量化为DH/λ>1(DH为水力直径,λ为爆轰胞格尺寸)。采用忽略黏性的二维欧拉方程作为控制方程,两步诱导反应速率模型描述化学反应过程,模拟研究了扰动波长和振幅对爆轰触发的影响。数值模拟结果表明,低振幅、高频率的扰动可诱导产生更多的横波增强波阵面的不稳定性,有助于爆轰触发。

     

  • 图  实验装置示意图

    Figure  1.  Schematic diagram of experimental apparatus

    图  计算区域示意图(在当量比为1的氢气-氧气混合物中引入振幅为A、波长为η的扰动)

    Figure  2.  Schematic of calculation zone (A disturbance with the amplitude of A and wavelength of η is introduced to stoichiometric hydrogen-oxygen mixture.)

    图  平均传播速度与初始压力之间的关系曲线

    Figure  3.  Average velocity as a function of initial pressure

    图  临界条件下典型爆轰胞格结构记录

    Figure  4.  Typical detonation cellular patterns at the critical condition

    图  圆柱横截面示意图

    Figure  5.  Schematic diagram of the cross-section of the cylindrical obstacle

    图  A=2.5、η=2时不同计算精度下的密度场和胞格结构

    Figure  6.  Density field and cellular structure for A=2.5, η=2 in the cases of different resolutions

    图  不同工况下爆轰触发所需时间

    Figure  7.  Detonation initiation time in the cases of different wavelengths and amplitudes

    图  A=2.5工况下数值模拟得到的纹影结果

    Figure  8.  Schlieren results in the simulation for the cases of A=2.5

    图  η=15工况下数值模拟得到的纹影结果

    Figure  9.  Schlieren results in the simulation for the cases of η=15

    表  1  爆轰触发实验结果

    Table  1.   Experimental result of detonation initiation

    Number of cylindrical obstaclesCritical pressure/kPaCell size/mmDH/mmDH/λ
    0374.4290.0020.36
    1284.9053.4213.70
    2284.9046.839.56
    3255.2033.816.50
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-05-31
  • 修回日期:  2022-06-13
  • 网络出版日期:  2022-11-12
  • 刊出日期:  2022-12-05

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