DF/HF化学激光器喷管总压损失的数值模拟

DF/HF化学激光器需要体积庞大的压力恢复系统才能够工作。为了综合考虑激光器和压力恢复系统一体化设计，对DF/HF化学激光器的两种喷管的内流场采用了CFD技术进行了模拟，比较了它们的总压损失的差别和内流场的不同，并讨论了这种不同对整个激光器性能的影响。计算结果表明，细喉道的喷管不但有利于减小激光器增益发生器的尺寸，而且它的总压损失近似于标准喷管，从而不会增加激光器后部压力恢复系统的体积。

Total pressure losing of nozzles flow in DF/HF chemical laser by numerical simulation

The DF/HF chemical laser needs the pressure recovery system with huge volume to work successfully. In order to optimize the design of the laser and the pressure recovery system, the flow field and total pressure losing of two types nozzles(standard nozzle and thin neck nozzle) in DF/HF chemical lasers was studied by numerical simulation. The difference of their total pressure losing and interior flow field were compared. Then the influence of the difference on the entire laser system performance was discussed. The computer result shows that the total pressure losing of the thin neck nozzle was as same as the standard nozzle. So, using the thin neck nozzle was benefit to diminishing the volume of gain generator of the DF/HF chemical laser. And it did not take more berden to the pressure recovery system. So, the pressure recovery system at the end of the laser will not have to be enlarged.