چكيده به لاتين
Abstract
Spray evaporation of liquid fuels in turbulent flow is a common process in many industrial applications such as combustion, cooling and processes including chemical reactions. Interactions between fuel droplets (discrete phase) and fluid flow (continuous phase) have a considerable effect on liquid fuel evaporation. In this research, both single phase and two phase modelling of liquid fuel injection into the combustion chamber are presented. Finite volume method is used for solving equations and to do so, a structural mesh has been employed. An implicit, second order discretization method is used for discretizing the equations. Euler and Lagrangian approaches are applied for continuous and discrete phases, respectively, and simulation of turbulent flow is carried out employing both the RANS and LES approaches. Results are presented in two different parts: single phase and two phase and also for both modes. An acceptable agreement with the experimental data is observed. The results show that the LES approach is better than the RANS approach and close to the fuel nozzle, small droplets are distributed in the center of chamber while the larger droplets are mainly distributed near the edge of spray. Moving further from fuel nozzle, the distribution of droplets size become more and more uniformly. Also, the velocities obtained by the two phase and single phase modellings concerning the downstream of flow field seem to have a similar pattern and become more comparable with the flow inside a channel.
Keywords: Gas Turbine Combustor, Two Phase Flow, Liquid Fuel Spray, Turbulent Flow
