Analysis of Liquid Fuel Spray in an Evaporating Chamber

During the liquid fuel spray, there are various phenomena that considering or not taking them into the numerical simulation has a great impact on the cost and accuracy of calculations. The purpose of this paper is to investigate whether or not to take into account phenomena such as radiation heat transfer, secondary breakup, gravity and type of turbulence model. In this work, the spray of liquid fuel droplets in hot air is modeled by the Eulerian-Lagrangian approach. The radiation heat transfer and secondary breakup are simulated employing the discrete ordinates model and the TAB model, respectively. The flow governing equations are implicitly linearized and discretized of the second order. The results show that in evaporative spray flow, gravity and radiation heat transfer have a little effect on the behavior and the diameter distribution of fuel droplets in the evaporative chamber and considering them will only increase the cost of calculations. In addition, droplet breakup can be ignored. The results show that the obtained axial velocity distribution and the diameter distribution of the droplets from simulation have an acceptable agreement with the experimental data. Where the droplets are in the recirculation zone and being a higher relative velocity between the hot air and the droplets, more droplets evaporate.