收缩段线型对超音速喷管氟原子气相复合的影响

使用移轴维氏曲线和双三次方曲线作为收缩段线型分别设计了两种环形 HYLTE主喷管，给出了环形HYLTE喷管三维的多组分有反应湍流场的控制方程、边界条件和 模拟区域的选择. 计算结果表明，这两种线型的喷管均能避免边界层的分离，获得均匀的流 场分布及相同的出口马赫数分布，但移轴维氏曲线在收缩段前部收缩快速，气流速度相应较 快，因此F原子的气相复合程度弱于另外一种收缩段设计的喷管，相应地，使用移轴维氏曲 线设计的喷管F原子流量比另外一种喷管高5%左右, 因此使用移轴维氏曲线作为环形HYLTE主喷管收缩段的设计有助于提高化学激光器的效率.

Effects on f recombination in annular hypersonic low-temperature nozzle with different contraction curves

Annular Hypersonic Low-Temperature (HYLTE) nozzle array is the gain generator assembly in cylindrical chemical lasers. In this paper, double cubic and Witozinsky curves are applied to the design of HYLTE nozzle convergent contour, and two kinds of HYLTE nozzles are designed. Based on 3D Navier-Stokes equations and the realizable k- \varepsilon model, the multi-species reacting flow field of the annular HYLTE nozzles is calculated. The numerical simulation results show that both contraction curves can prevent the separation of boundary layers, and the difference of fluid dynamics parameters in the divergent section is negligible. However, with the nozzle designed by Witozinsky curve the fluid velocity is higher as compared with that designed by double cubic cueve, thus the recombination of F atom is slower, and the mass rate of F atom is about 5{\%} higher. It can be concluded that cylindrical chemical laser with a convergent section nozzle designed by Witozinsky curve works with a higher efficiency.