【摘要】 对脉冲爆轰发动机两次循环工作过程进行轴对称数值模拟,考虑了包含19个基元反应和9种组份的H2-O2-N2详细化学反应动力学机理,通过改进的ISAT方法(动态自适应建表)减少反应化学的计算时间。数值结果显示了脉冲爆轰发动机充气,起爆,卸压和再充气的循环工作过程。根据数值计算结果,详细地讨论了两次循环管内、外流场的结构间的差异。两次循环中管内、外流场结构的差异又导致二者推力和冲量的不同。更多还原

【Abstract】 By solving axisymmetric Navier-Stokes equations in conjunction with the chemistry,numerical simulation of two cycle of pulse detonation engine was performed,and a detailed chemical mechanism of H2-O2-N2 system,which included 19 element reactions and 9 species,was involved.An in situ adaptive tabulation(ISAT) method was improved to enhance the computational performance of combustion chemistry.The calculated results showed the process of fueling,initiation,blowing down and refueling.Based on the numerical results,the difference of dynamics mechanism of external flow field between 1st cycle and 2nd cycle was elucidated systematically.Thrust and impulse during two cycles varied with the difference of the flow pattern in the internal and external flow fields.更多还原