Modeling of n-Hexane and n-Octane liquid fuel jets in gaseous crossflow for evaporation, combustion and breakup evaluation

This paper investigates the phenomena of liquid fuel jets in gaseous crossflow for two types of fuels, namely n-Hexane and n-Octane. In this regard, a numerical model is developed to predict a droplet behavior including trajectory, velocity, evaporation and combustion, size degradation, breakup time and radius of produced child droplets. Therefore, the mass, concentration, energy and momentum conversation equations are derived to evaluate the droplet acceleration from initial conditions. The velocity distribution is then obtained through a numerical integration of the acceleration over time. A further integration is made to determine the droplet position. In addition, evaporation and combustion and Taylor Analogy Breakup (TAB) models are integrated to assess droplet evaporation, combustion rate, and breakup behavior during the injection process. The professional version of the Engineering Equation Solver (EES) software is used to solve the model which has the advantage of providing the thermodynamic properties of the different fluids involved through predefined functions. The behaviors of droplets are investigated for two injection cases: evaporation only and evaporation and combustion. The results obtained are presented in the variations in trajectories, velocities, droplet size and surface temperature corresponding to each case and type of fuel.