孔板扰动对爆轰波胞格结构特性影响的实验研究

武郁文; 褚驰; 翁春生; 郑权

doi:10.11883/bzycj-2018-0482

孔板扰动对爆轰波胞格结构特性影响的实验研究

doi: 10.11883/bzycj-2018-0482

南京理工大学瞬态物理国家重点实验室，江苏南京 210094

基金项目: 国家自然科学基金（11702143，11802137）；中央高校基本科研业务费专项（30918011343）

详细信息

作者简介:
武郁文（1987－　），男，博士，副研究员，y.wu@njust.edu.cn

中图分类号: O381
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出版历程
- 收稿日期: 2018-11-30
- 修回日期: 2019-06-17
- 网络出版日期: 2019-10-25
- 刊出日期: 2019-11-01

Experimental research on the influence of orifice plate perturbation on detonation cellular structure characteristics

National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

摘要

摘要: 实验采用稳定预混气2H₂+O₂+3Ar及不稳定预混气C₂H₂+5N₂O和CH₄+2O₂，在圆形爆轰管内通过烟膜手段记录了爆轰波的胞格结构，得到了胞格尺寸与初始压力之间的关系式；研究了胞格结构在扰动上下游的变化过程，分析了胞格不稳定性对胞格结构特征的影响，获得了爆轰波经过扰动后重新恢复至平衡状态的特征尺度。结果表明：爆轰波经过扰动后，对于稳定预混气，在扰动下游主胞格结构变得不规则，没有出现次生胞格；对于不稳定预混气，扰动下游伊始爆轰波的次生模态被抑制，由于爆轰波自身的不稳定性，随后出现了局部爆炸点及精细胞格结构；爆轰波在扰动下游传播了一段距离后恢复至平衡状态，该长度在8～15倍之间的胞格尺寸范围内变化，并且随初始压力的变化趋势并不明显。研究结果反映出爆轰波经过孔板扰动后恢复至平衡态所需的长度与爆轰波流体动力学厚度相当。
- 爆轰波 /
- 孔板扰动 /
- 胞格不稳定性 /
- 特征尺度
Abstract: The influence of orifice plate perturbation on detonation cellular structure was experimentally investigated. The cellular structure of detonation wave was recorded in a circular detonation tube withthe smoked film method.The stable mixture 2H₂+O₂+3Ar and unstable mixture C₂H₂+5N₂O and CH₄+2O₂ were used. The correlation between cell size and initial pressure was obtained. The variations of cellular structure upstream and downstream of perturbation were studied, and influence of cellular instability oncellular structure characteristics was analyzed. The characteristic length scaleofdetonation recovery from perturbation was obtained. The results show that after the perturbation the main cell structure becomes irregular when no secondary cells appearfor the stable mixture,while for the unstable mixture, the secondary modes of the detonation wave downstream of the perturbationareinitially suppressed, subsequently the local explosions and fine cellsare generated due to the cellular instability. The detonation wave propagates some distance and recovers to the equilibrium state. This characteristic length varies within the range of 8 to 15 timesthe cell size, while it does not change with the initial pressure. The resultimplies that the characteristic length scale of the detonation wave recovery fromthe perturbationequatesto the detonation hydrodynamic thickness.
- detonation wave /
- orifice plate perturbation /
- cellular instability /
- characteristic length scale

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图 1 实验系统示意图

Figure 1. Schematic of the experimental system

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图 2 三种预混气形成的爆轰波自持传播时的胞格结构

Figure 2. Self-sustained propagating detonation structures with three premixed mixtures

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图 3 实验测得三种预混气形成的爆轰波胞格尺寸

Figure 3. Experimentally measured detonation cell sizes of three premixed mixtures

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图 4 2H₂+O₂+3Ar爆轰波经过扰动的胞格结构变化

Figure 4. The evolution of detonation cellular structure with the perturbation for 2H₂+O₂+3Ar mixtures

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图 5 C₂H₂+5N₂O爆轰波经过扰动的胞格结构变化

Figure 5. The evolution of detonation cellular structure with the perturbation for C₂H₂+5N₂O mixtures

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图 6 CH₄+2O₂爆轰波经过扰动的胞格结构变化

Figure 6. The evolution of detonation cellular structure with the perturbation for CH₄+2O₂ mixtures

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图 7 无扰动及有扰动情况下爆轰波胞格结构变化对比

Figure 7. Comparison of detonation cellular structure variations with and without perturbation

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图 8 过渡区长度随着初始压力p₀的变化趋势

Figure 8. Variation of the transition length with the initial pressure p₀

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表 1 胞格尺寸$\lambda $与初始压力p₀之间的函数关系参数

Table 1. Parameters ofcorrelation between cell size $\lambda $ and initial pressure p₀

预混气类型 a b

2H₂+O₂+3Ar 425.12 1.15
C₂H₂+5N₂O 183.57 1.70
CH₄+2O₂ 1 216.35 1.36

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