翼片扰动对COIL超音速平行流混合的影响

Effects of trip tabs on supersonic mixing of parallel flows in COIL

氧碘混合过程是化学氧碘激光器（COIL）中的一个重要步骤,氧碘混合质量直接决定着COIL的运行效率和光束质量.采用化学荧光法,研究了两种不同结构的扰动翼片组对COIL超音速平行流混合过程的影响.实验结果表明,1#扰动翼片组对氧碘超音速平行流的混合增强效果明显,其荧光区达到主气流中心线所经历的流向距离大幅缩短,碘解离区内的荧光区与测试区的面积比相对于无混合扰动时提高了4.2倍;采用2#翼片组扰动混合时,流向距离值进一步缩短了40％～60％,碘解离区内的面积比值又提高了20％～40％.氧发生器有/无主载气条件（2#翼片组）下的混合过程比较显示后者混合效果更好.

The process of oxygen-iodine mixing is one of the most important steps in chemical oxygen-iodine laser （COIL）. The quality of oxygen-iodine mixing is directly related to the COIL＇s operating efficiency and beam quality. Employing chemical fluorescence method （CFM） ,the effects of trip tabs on the process of supersonic mixing of parallel oxygen-iodine flows in COIL was studied. The experimental results indicated that the mixing process with 1# trip tabs was improved obviously. Comparing with the mixing without trips, when using 1# trip tabs, the streamwise distance required by the fluorescence to reach the center line of the primary flow was shortened largely and the area ratio of fluorescence in the region of iodine dissociation region was en larged by 4.2 times. When using 2# trip tabs, the streamuise distance decreased increased by 20%-40% again. Using 2# trip tabs, the mixing processes with and and the results showed that the latter was better. further by 40%-60%, and the area ratio value without the primary buffer gas were compared,