基于小尺寸模型分析氢氧旋转爆轰波传播的不稳定性机制

徐鸿飞 王放 武郁文 翁春生

徐鸿飞, 王放, 武郁文, 翁春生. 基于小尺寸模型分析氢氧旋转爆轰波传播的不稳定性机制[J]. 爆炸与冲击. doi: 10.11883/bzycj-2024-0130
引用本文: 徐鸿飞, 王放, 武郁文, 翁春生. 基于小尺寸模型分析氢氧旋转爆轰波传播的不稳定性机制[J]. 爆炸与冲击. doi: 10.11883/bzycj-2024-0130
XU Hongfei, WANG Fang, WU Yuwen, WENG Chunsheng. Investigation into the instability mechanism of hydrogen-oxygen rotating detonation wave propagation using a small-scale model[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0130
Citation: XU Hongfei, WANG Fang, WU Yuwen, WENG Chunsheng. Investigation into the instability mechanism of hydrogen-oxygen rotating detonation wave propagation using a small-scale model[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0130

基于小尺寸模型分析氢氧旋转爆轰波传播的不稳定性机制

doi: 10.11883/bzycj-2024-0130
基金项目: 国家自然科学基金(12202204);江苏省自然科学基金(BK20220953)
详细信息
    作者简介:

    徐鸿飞(1999- ),男,硕士研究生,122121011548@njust.edu.cn

    通讯作者:

    王 放(1993- ),男,博士,教授,wfnjust@126.com

  • 中图分类号: O381; V437

Investigation into the instability mechanism of hydrogen-oxygen rotating detonation wave propagation using a small-scale model

  • 摘要: 氢氧的高反应活性给旋转爆轰波的稳定传播带来了巨大的挑战,为研究氢氧旋转爆轰波传播不稳定性,通过改变当量比对小尺寸模型下二维氢氧旋转爆轰波进行数值模拟研究,揭示了氢氧旋转爆轰波复杂多变的传播特性,并分析了典型流场结构,探讨了传播模态的不稳定性以及爆轰波湮灭和再起爆机制。结果表明:随着当量比的提高,流场内分别呈现熄爆、单波、单双波混合3种传播模态,且爆轰波的传播速度随当量比的增大几乎呈线性提高,速度亏损为5%~8%。激波的扰动使得爆燃面失稳产生明显的扭曲和褶皱,氢氧的高反应活性让爆燃面明显分层且在2个分界面上呈现不同的不稳定性,上分界面为Kelvin-Helmholt (K-H)不稳定性,下分界面为Rayleigh-Taylor (R-T)不稳定性。单双波混合模态下爆轰波极不稳定,保持湮灭、单波、双波对撞3种状态之间循环。爆轰波有2种湮灭方式:一是双波对撞导致爆轰波湮灭,二是爆燃面燃烧加剧使得爆燃面下移导致爆轰波湮灭。再起爆的主要原因是:R-T不稳定性诱导爆轰产物与新鲜预混气在爆燃面上相互挤压产生尖峰和气泡结构,增强爆燃面上的反应放热,产生了局部热点并逐渐增强为爆轰波,实现爆燃转爆轰。
  • 图  1  二维计算模型

    Figure  1.  Two-dimensional computational model

    图  2  不同网格尺寸下的温度云图

    Figure  2.  Temperature contours under different grid sizes

    图  3  不同当量比下爆轰波的传播速度和速度亏损

    Figure  3.  Detonation wave velocities and velocity deficits at different equivalence ratios

    图  4  工况4下流场温度和压力梯度云图

    Figure  4.  Temperature and pressure gradient contours in case 4

    图  5  工况9下流场温度梯度、马赫数、密度和速度云图

    Figure  5.  Temperature gradient, Mach number, density and velocity contours in case 9

    图  6  密度云图中S2分界面处Atwood数的分布

    Figure  6.  Distribution of Atwood number along the contact surface S2 in the density contour

    图  7  斜压扭矩的大小分布及沿S2表面的局部放大图

    Figure  7.  Distribution of baroclinic torque and local enlarged view along the contact surface S2

    图  8  工况5下压力变化曲线

    Figure  8.  Time curve of pressure in case 5

    图  9  工况5单双波混合模态下流场发生对撞过程的温度云图

    Figure  9.  Temperature contours of collision of detonation waves in hybrid waves in case 5

    图  10  工况5下入口处各组分质量分数和热释放率

    Figure  10.  Mass fraction and heat release rate curves of different components at the inlet boundary in case 5

    图  11  爆轰波发生湮灭时温度和温度梯度云图

    Figure  11.  Temperature and temperature gradient contours during detonation wave quenching

    图  12  爆轰波再起爆时温度云图

    Figure  12.  Temperature contours during reinitiation

    图  13  氢氧旋转爆轰波传播不稳定机制总结

    Figure  13.  Summary of the unstable mechanism of hydrogen-oxygen rotating detonation wave propagation

    表  1  爆轰波的传播速度、温度和压力的数值模拟结果和Chapman-Jouguet理论计算结果的对比

    Table  1.   Numerically-simulated propagation velocity, temperature, and pressure of detonation wave compared with ones calculated by the Chapman-Jouguet theory

    温度 压力 速度/(m∙s−1)
    模拟值/K 理论值/K 误差/% 模拟值/MPa 理论值/MPa 误差/% 模拟值 理论值 误差/%
    3687.31 3675.81 0.31 1.88 1.89 0.53 2881.8 2835.7 1.63
    下载: 导出CSV

    表  2  不同网格尺寸下的爆轰参数

    Table  2.   Detonation parameters under different grid sizes

    网格尺寸/mm 速度/(m∙s−1) 温度/K 压力/MPa
    0.015 1 979 3049 12.8
    0.020 1 975 3062 13.3
    0.025 1 962 3085 14.4
    下载: 导出CSV

    表  3  不同当量比工况下的计算结果

    Table  3.   Calculation results at different equivalence ratios

    工况 当量比 速度/(m∙s−1) 速度亏损/% 传播模态
    1 0.20 熄灭
    2 0.25 熄灭
    3 0.28 1 878 7.38 单波
    4 0.33 1 975 6.09 单波
    5 0.42 2131 6.05 单双波混合
    6 0.55 2294 6.41 单双波混合
    7 0.70 2486 5.61 单双波混合
    8 0.89 2676 5.49 单双波混合
    9 1.09 2838 5.59 单双波混合
    下载: 导出CSV

    表  4  爆轰波发生湮灭各个时刻的HfHdHs

    Table  4.   Hf, Hd and Hs during detonation wave quenching

    t/ms Hf /mm Hd/mm Hs/mm
    0.300 5.72 4.16 1.56
    0.336 4.68 2.60 2.08
    0.372 3.90 1.56 2.34
    0.388 3.38 0.00 3.38
    下载: 导出CSV
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  • 收稿日期:  2024-05-09
  • 修回日期:  2024-07-12
  • 网络出版日期:  2024-07-18

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