H_2-O_2/Air直接起爆形成爆轰临界能量的预测模型

Theoretical Prediction Model of Critical Energy for Direct Detonation Initiation in H_2-O_2/Air Mixtures

基于活塞做功模型,利用H2-O2/Air混合物爆轰临界管径和胞格尺寸,对直接起爆的临界能量进行预测,得出的预测结果和实验值吻合较好,可有效地预测H2-O2/Air混合物的临界起爆能量。基于预测模型得出在相同状态下,H2-Air混合物的临界起爆能量显著大于H2-O2混合物。进一步开展了ZND诱导区长度的研究,计算结果清晰地表明:在相同条件下,H2-Air混合物的诱导区长度明显大于H2-O2混合物,由于临界起爆能量与诱导区的长度通常为三次方的关系,因此导致前者的临界起爆能量大于后者。此结论与活塞做功模型得出的两者临界起爆能量的规律相符。

Based on the critical tube diameter and detonation cell size data in H2-O2/Air mixtures, the piston work done model was used to predict their critical energies of direct initiation. The good agreement is found by comparing the theoretical predicted critical energies with those measured in the experiment. Thus, the theoretical model is proved to be able to predict the critical energy of H2-O2/Air mixtures within satisfactory. From the theoretical prediction model, it is obviously shown that the critical energy for H2-Air is significantly bigger than H2-O2 mixture when at the same initial conditions. The ZND induction zone length was further investigated to study the large critical energy discrepancy behavior between those mixtures, the results clearly indicated that the induction zone length for H2-Air is much longer than that of H2-O2 mixture at the same initial condition, and it is cube relationship between critical energy and induction zone length, which results in the bigger critical energy of the H2-Air mixture. This result is in agreement with the critical energy predicted from theoretical model.