化学氧碘激光(COIL)三维混合反应流场数值模拟研究

通过求解层流Navier-Stokes方程和组分输运方程,数值模拟了化学氧碘激光(COIL)三维扩压器和光腔中10组分21反应的内流流场,计算中没有考虑水蒸气在低温下的冷凝以及激光能量的输出。通过与国外文献计算结果比较可知,物性系数、化学反应速率常数、边界条件处理等对组分浓度影响较大,缺乏这些数据库将会影响计算结果。计算表明,三维副流射流基本穿透主流到达中心线,主副流混合较强,激发态粒子高浓度区主要在中心线附近,因此,也只有在中心线附近有较强的小信号增益系数,进一步研究混合增强技术可以提高原材料的使用效率以及激光的出光功率。本研究可为强激光武器系统之新型压力恢复系统的设计提供技术储备。

Numerical research on chemical reaction flowfield for 3D COIL

In this paper,the inner flowfield of a supersonic flow Chemical Oxygen-Iodine Laser(COIL) is simulated by solving 3D Navier-Stokes equations.The used chemical kinetic model includes 21 chemical reactions and 10 chemical species.In computation,it is assumed that the flow is laminar and the water vapor condensation due to the supersonic cooling is ignored.By comparison with computation results of reference,it is cleared that material parameters,chemical reaction rate constants and boundary conditions affect the species concentration very much.Thus,in order to increase the laser power,the small signal coefficient would be increased by enhancing the mixing.At last,the present computation results agree with the reference satisfactorily,it is suggested that the present research has developed an effective calculation method for COIL flow.