中文摘要：

考察球面爆轰波聚心传播过程中，波阵面附近压力和温度不断升高引起化学反应进程的改变；对比氢氧可燃气体与氮气的数值模拟结果，分析化学反应对波面温度和压力的影响，从而考察Zeldovich理论预测聚心爆轰波后参数的精确性．数值结果表明，爆轰波聚心传播初期，放热的燃烧反应对波后热力学参数起主导作用；传播后期，波阵面趋近于对称中心时，吸热的气体解离反应变得非常活跃，解离反应对后期的汇聚压力影响不大，但会在很大程度上限制汇聚温度的升高．

英文摘要：

Numerical simulation of spherically imploding detonation waves in hydrogen-oxygen is carried out in an elementary chemical reaction model. Compared with numerical results of imploding shock waves in nitrogen, the discrepancies of gas dynamic characteristics between shock and detonation waves are investigated during implosion. The effect of chemical reactions, combustion and dissociation on detonation waves is revealed. As the wave fronts converge toward the center of symmetry, the front pressures at different radii are almost the same in the two cases. However the front temperatures are different. The temperature increases more rapidly in nitrogen than in hydrogenoxygen mixture. Higher temperature is reached near the focal point in nitrogen due to its higher dissociation temperature. The energy released at the wave front is negligible in predicting pressure, while it needs to be considered in predicting temperature.