Numerical Simulation And Optimization Of Supersonic Chemical Oxygen Iodine Laser

Supersonic Chemical Oxygen Iodine Lasers(SCOIL) have Considerable potential for industry,military and science,because of its inherent high efficiency,the shortest wavelength and excellent beam quality.SCOIL is a complex process included flow, chemical reactions and lasing.Numerical simulations have ability on the interpretation and prediction of the physics underlying the SCOIL.Based on the numerical methods,this work has threefold achievement:—Numerical investigation of the mixing and reacting flows.According to the characteristic of SCOIL flow field,in the frame of computational fluid dynamic(CFD),the simulation method is developed to analyze and evaluate the mixing,chemical reactions and gain process.—Coupling computation of flow and optics.In SCOIL,the subsequent mixing and chemical reactions produce excited species which are partially reflected into the reacting flow medium.Evaluation of lasing process,hence,requires the simultaneous consideration of flow,chemical reactions, and radiative transports.A coupled flow-optics interaction computation method is developed and implemented with detailed fluid mechanics and geometric optical model. Computational results are validated through the comparison with measurements on a KW-class SCOIL experimental platform constructed in the Key Laboratory of Chemical Laser,Chinese Academy of Sciences.—Development of numerical optimization platform.A numerical optimization platform with the joint process of simulation and optimization is constructed for the design purpose of SCOIL.In this thesis,the platform is introduced and carried out to define the optimal flow boundary conditions with which the SCOIL has better performance on gain homogeneity.As a conclusion,in this thesis,a coupling simulation of flow and optics has been invested.The optimization platform is constructed and implemented for approaching the optimal parameter.The future extension of these evaluation and optimization methods plays a significant role in further development of SCOIL technology.