化学氧碘激光器内流场亚跨超音速混合的大涡模拟研究

摘要

利用大涡模拟对化学氧碘激光器内的亚跨超音速混合过程进行模拟分析,其结果表明了大涡模拟对这种低压、低密度、亚跨超音速及夹杂多种介质的化学流场的可执行性.与传统的雷诺平均仿真结果相比较,大涡模拟能掌握更多的流场细节数据,能够对混合过程进行精准地判断和分析.在此基础上,提出了碘流反向45°入流的设计方案以增强混合程度,计算表明采用此种方案在相应出光面上平均小信号增益系数提高了5%.%Large eddy simulation has been preformed for the mixing analysis of chemical oxygen-iodine lasers.Traceable results for both flow field and scalar field show that large eddy simulation is a valid approach for the theoretical study of chemical flows.Compared with Reynolds averaging numerical simulation,large eddy simulation is accredited a high accuracy in capture transport processes,especially for the small scale mixing.According to the simulation results,a new method of I2 flow injection has been proposed for the mixing enhancement.With this method,the small signal gain coefficient has increased by 5%.