High-Speed Drag Models for Supersonic Spray Combustion Application

The motivation for the present study is its relevance to supersonic spray combustion, such as in scramjet engines where liquid fuels are used. Evaluating various drag, heat and mass transfer models for two-phase high-speed flows is undertaken in this study as a path to achieving our ultimate objectives. In this work, several models for hydrodynamic drag coefficient in high-speed flows are introduced and three first order differential equations appropriate for supersonic flows that carry particles are solved. The results show that the models by Crowe and Hermsen show similar profiles. As the particle approaches the exit of the nozzle, better results can be obtained by Crowe’s model.