【摘要】 采用基元反应模型和高精度的ENO格式对气相爆轰进行数值研究,对H2/O2/Ar混合气体起爆和爆轰波传播过程的数值模拟结果表明,计算的爆轰波阵面参数和实验相当符合。数值研究的结果还表明,爆轰波反应区中参与反应的不同组分具有不同类型的变化特征。计算结果的精度随着网格尺寸增加而增加,并能保持较好的收敛性。更多还原

【Abstract】 The gaseous detonation process of H2/O2/Ar mixture was numerically simulated with detailed chemical reaction model, which included 9 species and 19 elementa ry reactions. The onedimensional governing equations were solved with a high o rder ENO scheme. Flows and reactions were coupled by a timesplitting method, i n which the computations of reaction process were carried out with the chemical kinetics solver CHEMEQ. The temperature of flows was also iterated after each ti mestep of reaction calculation and each timestep of flow calculation. Gaseou s detonation was developed after the ignition in a high pressure and high temper ature gas pocket at the rigid end of a tube. The initiation process showed a ove rdriven period before the wave reached a constant propagation velocity. The calc ulated parameters of detonation wave, such as detonation wave velocity, CJ pre ssure and Von Neumann spike pressure, were compared with GordonMcBride code an d experimental data, the agreement between them appears to be good, in general. However the calculated reaction zone length is much larger than the steadystat e results. The properties of each species in reaction zone were also analyzed, w hich showed that all the species could be classified into three groups by their magnitude of concentration, which seemed useful to explosion safety designs. 更多还原