Numerical analysis of spatial evolution of the small signal gain in a chemical oxygen–iodine laser operating without primary buffer gas |
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Authors: | Zongmin Hu Zonglin Jiang Rhoshin Myong Taehwan Cho |
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Affiliation: | aLHD Laboratory, Institute of Mechanics, CAS, Beijing 100080, China;bResearch Center for Aircraft Parts Technology and School of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinju 660-701, South Korea |
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Abstract: | A chemical oxygen–iodine laser (COIL) that operates without primary buffer gas has become a new way of facilitating the compact integration of laser systems. To clarify the properties of spatial gain distribution, three-dimensional (3-D) computational fluid dynamics (CFD) technology was used to study the mixing and reactive flow in a COIL nozzle with an interleaving jet configuration in the supersonic section. The results show that the molecular iodine fraction in the secondary flow has a notable effect on the spatial distribution of the small signal gain. The rich iodine condition produces some negative gain regions along the jet trajectory, while the lean iodine condition slows down the development of the gain in the streamwise direction. It is also found that the new configuration of an interleaving jet helps form a reasonable gain field under appropriate operation conditions. |
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Keywords: | Chemical oxygen– iodine laser (COIL) Without buffer gas Interleaved jet |
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