Optimization of flow rate ratio of primary to secondary flow in COIL based on gain distribution

There are strong interactions or couples among multi-fields in the mixing nozzle of the COIL, such as gas-dynamics, chemical reaction kinetics and optics. Three-dimensional CFD technology was applied on the RADICL model by solving the laminar Navier-Stokes equations and transportation equations to study the small signal gain distributions. A simulation was done in the condition of different flow rate ratio of primary to secondary flow. Results show that the appropriate flow rate ratio plays an important role on the spatial distribution of the small signal gain. Both too high and too low concentration of iodine goes against the proper gain.