Numerial simulation on boron-based gas diffusion combustion by different gaseous combustion models

For selection of boron-based fuel-rich gas turbulent diffusion combustion model in solid ramjet rocket secondary combustion chamber, parallel intake combustion apparatus was designed as physical model. On foundation of boron particles King ignition model and L-W burning model, turbulent diffusion combustion process was simulated by numerical simulation methods which adopted Finite-Rate/Eddy-Dissipation model, Eddy-Dissipation model, Laminar Finite-Rate model respectively. Flame structure and flow field characteristics of turbulent diffusion combustion were acquired, and combustion characteristics of different combustion models were obtained. Different turbulent combustion mechanisms have different influence on gaseous combustion process and particle combustion process, and inherent mechanism of different influence reveals that combustion model has different ability to simulate different process. The most intensity of gas phase reactor simulation is Eddy-Dissipation model, followed by Finite-Rate/Eddy-Dissipation model, and Laminar Finite-Rate model is the slowest; when boron particle ignition reaction is simulated, Finite-Rate/Eddy-Dissipation model is the most dramatic, followed by Laminar Finite-Rate model, and Eddy-Dissipation model is the slowest; but Eddy-Dissipation model is the fastest for boron particle combustion reaction, followed by Laminar Finite-Rate model, and Finite-Rate/Eddy-Dissipation model is the slowest.