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Cellular Aluminum Particle-Air Detonation Based on Realistic Heat Capacity Model

机译：基于现实热容模型的细胞铝颗粒 - 空气爆轰

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摘要

Modeling aluminum (Al) particle-air detonation is extremely difficult because the combustion is shock-induced, and there are multi-phase heat release and transfer in supersonic flows. Existing models typically use simplified combustion to reproduce the detonation velocity, which introduces many unresolved problems. The hybrid combustion model, coupling both the diffused- and kinetics-controlled combustion, is proposed recently, and then improved to include the effects of realistic heat capacities dependent on the particle temperature. In the present study, 2D cellular Al particle-air detonations are simulated with the realistic heat capacity model and its effects on the detonation featured parameters, such as the detonation velocity and cell width, are analyzed. Numerical results show that cell width increases as particle diameter increases, similarly to the trend observed with the original model, but the cell width is underestimated without using the realistic heat capacities. Further analysis is performed by averaging the 2D cellular detonations to quasi-1D, demonstrating that the length scale of quasi-1D detonation is larger than that of truly 1D model, similar to gaseous detonations.
机译：涂铝（Al）颗粒 - 空气爆炸是极其困难的，因为燃烧诱导，并且存在多相热释放和超音速流动。现有模型通常使用简化的燃烧来再现爆轰速度，这引入了许多未解决的问题。最近提出了混合燃烧模型，耦合扩散和动力学控制的燃烧，然后改善，包括依赖于颗粒温度的现实热容量的影响。在本研究中，通过现实的热容量模型模拟了2D蜂窝Al颗粒 - 空气爆炸，分析了其对爆炸特征参数的影响，例如爆轰速度和电池宽度。数值结果表明，由于粒径增加，细胞宽度增加，类似于用原始模型观察到的趋势，但是电池宽度被低估而不使用逼真的热容量。通过对准1D平均2D蜂窝爆炸来进行进一步的分析，证明了准1D爆炸的长度比大于真正的1D模型的长度，类似于气体爆炸。

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  • 来源
    《Combustion Science and Technology》 |2020年第12期|1931-1945|共15页
  • 作者

    Xiang GaoXiang; Yang Pengfei; Teng HongHui; Jiang ZongLin;

  • 作者单位

    Northwestern Polytech Univ Sch Mech Civil Engn & Architecture Xian Shaanxi Peoples R China|Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China|Beijing Inst Technol Sch Aerosp Engn Beijing Peoples R China;

    Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Al particle; cellular detonation; heat capacity; hybrid model;

    机译：al粒子;细胞爆炸;热容量;混合模型;

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