Numerical Simulation of Combustion Flows in Gas Generator

In order to enhance the performance of gas generators and optimize the structures, combustion flows were simulated. The turbulence was solved by the RNG two-equation model, the reaction was settled by the simple chemical reacting system (SCRC) of the infinitely fast chemical reaction assumption and the beta probability density function (PDF) without the intermediate reactions, the radiative heat transfer was calculated by P-l radiation model, the physical nozzle was simulated by the pressure-swirl atomizer model, and the emission of NOx was simulated as well. The characteristic parameters of the nonpremixed combustion flows between the air and the C₁₂H₂₃, such as pressure, temperature and velocity etc, were obtained with FLUENT program about different structures and air-inlet conditions. The follows were considered and demonstrated with simulation results: the resistance character of structures, the relationship between the mass of cooling-air and the temperature distribution on inner walls, the NOx emissions etc.