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矩形管内临界爆轰动力学数值分析

DOI: 10.11858/gywlxb.2006.02.004, PP. 133-138

Keywords: 临界爆轰,基元反应,数值模拟,横波,旋涡,未反应气囊

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Abstract:

对矩形管内临界爆轰动力学特征进行了数值分析。采用基元反应描述爆轰化学反应过程,采用二阶附加半隐的龙格-库塔法和5阶WENO格式求解二维反应欧拉方程。对于25%氩稀释化学计量比的氢氧预混气体,当管道宽度为30mm、初温为300K时,产生临界爆轰的预混气体初压为3.5kPa。在此临界条件下,获得了临界爆轰胞格结构、沿壁面的速度和峰值压力曲线及流场波系演变特征。着重对比分析了矩形管内临界爆轰与普通爆轰在爆轰波速度、平均速度、胞格宽长比、横波结构、未反应气囊及旋涡结构之间的差异,深入认识了临界爆轰的不稳定性和化学反应动力学特征。

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