Influence of Chemical Mechanisms on Spray Combustion Characteristics of Turbulent Flow in a Wall Jet Can Combustor

Abstract

The objective of present paper is to assess the influence of different chemical mechanisms on nonpremixed combustion of kerosene liquid fuel in a gas turbine model combustor. Simulation of two-phase reacting flow is performed employing realizable k – ε turbulence, laminar flamelet combustion, and discrete ordinates radiation models in a structured finite volume grid. An Eulerian–Lagrangian approach is applied to model spray of liquid fuel. Distributions of mean axial velocity, temperature, scalar dissipation rate, mixture fraction, mass fraction, and rate of formation of carbon dioxide, water vapor, and nitrogen monoxide are compared for three different cases (three different chemical reaction mechanisms). Results depict that minimum deviations concerning the mean axial velocity and mean temperature are observed for case A, which consists of 17 species and 26 reaction steps. The maximum scalar dissipation rate is shown for case B, comprising 21 species and 30 reactions steps due to a higher mixture fraction variance. By enhancing the laminar scalar dissipation rate, mean temperature is reduced against mixture fraction. The reaction development and energy release rates are slower for case C, including 16 species and 26 reactions steps. The concentrations of predicted NO and CO 2 for the three cases are different due to the predicted temperature differences. The thermal NO formation rate is higher for case A, then C, and last of all B.