The impact of inner air jet on fuel mixing mechanism and mass diffusion of single annular extruded nozzle at supersonic combustion chamber

In this research, the usage of an extruded annular nozzle for mixing fuel through the combustion chamber is fully studied. The chief focus is to reveal the flow of the fuel jet by three-dimensional simulation of the sonic hydrogen jet with two nozzle heights (1 mm and 2 mm). The main novelty of this study is the connection of mass diffusion mechanism on fuel mixing of jet released from the extruded nozzle in combustion chamber. The computational method is developed for modeling of highly compressible airflow with a cross-fuel jet released from an extruded nozzle. Both annular and coaxial fuel and air jet are investigated to find the efficient mechanism of fuel distribution inside the combustor. The flow parameters and vortex structure near the injector are fully analyzed. RANS equations are used for the modeling of the high-velocity flow. Our results show that the injection of fuel through the extruded nozzle improves the performance of fuel mixing in the combustor. Coaxial fuel and air jets released from extruded nozzle is more efficient for fuel injection system due to formation of strong interactions of the fuel with free air stream.