Numerical Simulation Of Processes In A Low-Emission Combustion Chamber With Two-Stage Swirler

Ecological requirements of the aircraft engine emission bring new challenges to the engineers to make new research and designs of combustion chambers.The main aim is to design high performance and ecological engines,and the numerical simulation of combustion processes and pollutant formation using computational fluid dynamics packages is the powerful design approach to reach it.This master’s degree dissertation represents the numerical simulation for the analysis of combustion chamber of fuel spray,in various nozzle geometries in a cannular type of combustion chamber with a radial and axial two-stage swirler of complex geometry.All results of the simulation are analyzed in 3 various nozzle dimensions with the step of 1 mm.In this dissertation,Jet-A aviation fuel and the k-w Shear-Stress-Transport(SST)turbulence model are used.The Eddy dissipation model was employed to simulate the combustion process.Steady-state and three-dimensional computational fluid dynamic studies were conducted using ANSYS CFX.To verify the grid model,the mesh independence study was implemented.The obtained results were investigated from the point of view of the distribution of velocity of the flow along the path of the combustion chamber,as well as the distribution of temperature and NO mass fractions.It was concluded that the NO mass fraction distribution is similar to the temperature distribution,and NO concentration is optimal when the nozzle diameter is the largest.