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Effiecient Oxygen-Iodine Chemical Laser Operated by Supersonic Flow

超音速流操作的高效氧碘化学激光器

基本信息

批准号：
07555340
负责人：
FUJII Nobuyuki
金额：
$ 1.86万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

There has been much interest in the excitation of atomic iodine via the I^2P_<1/2>-I^2P_<3/2> transition in the presence of singlet oxygen (O_2 (^1DELTA)) for chemical oxygen iodine laser (COIL). Generally, the transition in the iodine atoms is pumped by resonant energy transfer from O_2 (^1DELTA), which is produced chemically via the reaction of H_2O_2 in alkali solution with chlorine.The complicated flow field of a SCOIL is simulated by solving the three-dimensional Navier-Stokes equations and effects of mixing/reacting zone structure on the resulting gain region are studied. A chemical kinetic model encompassing 21 chemical reactions is used to determine the chemical composition of gas mixture. The numerical result shows that the cross section of the iodine jet is stretched significantly due to the strong shear force and a pair of contrarotating vortices are formed behind the curved jet. The vortices greatly enhances the mixing and the simultaneous chemical reaction. This result clearly demonstrates the importance of contrarotating vortices behind the iodine jet upon the laser performance.Excitation of iodine atoms, i. e., the transition I^2P_<1/2>-I^2P_<3/2>, effectively occurs, when discharged iodine is mixed with a discharged oxygen flow containing singlet oxygen, O_2 (^1DELTA). We demonstrate that microwave discharge of molecular iodine is useful for the formation of atomic iodine and that the resultant atom is excited by O_2 (^1DELTA) in a two discharge-flow system.

在化学氧碘激光器(COIL)中，通过单线态氧(O_2(^1DELTA))的I^2P_&lt；1/2&gt；-i^2P_&lt；3/2&gt；跃迁激发碘原子一直是人们研究的热点。通常情况下，碘原子的跃迁是通过H_2O_2在碱性溶液中与氯反应产生的O_2(^1DELTA)的共振能量转移来泵浦的。通过求解三维N-S方程模拟了螺旋线圈的复杂流场，并研究了混合区/反应区结构对增益区的影响。包括21个化学反应的化学动力学模型被用来确定混合气体的化学组成。数值结果表明，由于强烈的剪切力，碘喷流的横截面被显着拉长，并且在弯曲喷流的后方形成了一对相反的旋涡。旋涡极大地增强了混合和同时发生的化学反应。这一结果清楚地表明了碘喷流后的涡旋对激光性能的重要性。当放出的碘与含有单线态氧的放出氧流O_2(^1DELTA)混合时，有效地发生了碘原子的激发，即i^2P&lt；1/2&gt；-i^2p&lt；3/2&gt；我们证明了分子碘的微波放电有利于原子碘的形成，并且在两个放电-流动系统中，生成的原子是由O_2(^1DELTA)激发的。