Вивчення впливу кута розширення факела на стабільність горіння у камері згорання авіаційних двигунів

In this research, a comprehensive numerical analysis was employed to anticipate the total temperature characteristics, NO emissions, and pattern factor within an annular combustor liner. The investigation focused on the impact of various flare angles (25°, 30°, 35° and 40°) of a double axial swirler across four distinct cases, utilizing computational fluid dynamics (CFD) techniques. The simulations were conducted using ANSYS CFX, incorporating finite-rate chemistry and the eddy dissipation model to simulate the combustion of liquid kerosene (C12H23) with air, specifically accounting for fuel droplet evaporation. Spray modeling, inclusive of a Rosin-Rammler droplet distribution, was implemented to capture the intricate dynamics of liquid kerosene combustion. Thermal and prompt nitrogen oxide (NOx) formation processes were conducted, employing a K-epsilon model for turbulence within a realistic annular combustion chamber. The research further delved into presenting the characteristic features and flame structure, showcasing contour plots of total temperature and NO concentration at the combustor liner outlet. Additionally, cross-sectional analyses along the X-axis from the injector center of the combustor were performed, accompanied by charts illustrating relevant trends along the liner from the injector center. This study introduces two-step kinetic schemes for the combustion of kerosene with air, shedding light on the intricate mechanisms underlying the process. The findings indicate that the optimal outcome, characterized by a lower NO concentration, is associated with the case featuring a reduced flare angle compared to the other configurations.