Effect on Fuel Supply Angle on Outlet Temperature Distribution and NOx Emission in a Micro Trapped Vortex Combustor

This paper presents the design of a micro trapped vortex combustor to enhance the efficiency and reduce the emissions of the micro turbojet engine. A numerical simulation is conducted at various Mach numbers and fuel/air ratios to examine the impact of changing the fuel supply angle on the outlet temperature distribution and NOx emission. The results demonstrate that when the Mach number increases, the emission of NOx progressively reduces and the outlet temperature distribution factor first drops before increasing. At low Mach numbers, the outlet temperature distribution is more uniform for smaller injection angles and vice versa. With the increase of fuel/air ratio, the outlet temperature distribution factor increases progressively, and there is a slight overall increase in NOx emissions. The fuel supply angle has minimal effect on NOx emission. In addition, a stable double vortex structure is formed in the cavity of the micro trapped vortex combustor, which will be conducive to improving the combustion efficiency of the combustor. This micro trapped vortex combustor has great potential for efficient combustion and reduced emissions.