ID 80

Large Eddy Simulation of Spray Jet in Subsonic Gaseous Cross Flow

 

Abstract:

In this numerical study, a 3-D simulation of two phase flow was conducted. The effects of atomization, break up, collision models on the penetration of water jet spray into a subsonic air crossflow under constant temperature and elevated pressures were examined. The OpenFoam open source code was considered along with the dynamic Lagrangian LES (Large Eddy Simulation) turbulent model. The effect of various parameters such as liquid jet velocity, pressure of crossflow as surrounding gas, the nozzle diameter and the momentum flux ratio, for non-evaporating conditions were explored. In particular, the effect of liquid jet and cross flow air velocity on the penetration height and the SMD (Sauter Mean Diameter) were studied in detail. The accuracy of different breakup and collision models were verified by comparing to available experimental data. The predicted results showed that the Reitz-Diwakar secondary breakup model and O’Rourke collision model presented favorable agreement in the case of water jet injection in air crossflow. The liquid jet penetration depth was found to increase with the increases of the liquid jet velocity, cross flow velocity, the nozzle diameter and surrounding pressures under constant momentum flux ratio. The resulting averaged Sauter mean diameter showed significantly reduction with respect to the increase of the liquid jet velocity and cross flow pressure.