Abstract
The incident shock wave generally has a strong effect on the transversal injection field in cold kerosene-fueled
supersonic flow, possibly due to its affecting the interaction between incoming flow and fuel through various
operation conditions. This study is to address scale effect of various injection diameters on the interaction between
incident shock wave and transversal cavity injection in a cold kerosene-fueled scramjet combustor. The injection
diameters are separately specified as from 0.5 to 1.5mm in 0.5mm increments when other performance parameters,
including the injection angle, velocity and pressure drop are all constant. A combined three dimensional Couple Level
Set & Volume of Fluids (CLSVOF) approach with an improved K-H & R-T model is used to characterize penetration
height, span expansion area, angle of shock wave and sauter mean diameter (SMD) distribution of the kerosene
droplets with/without considering evaporation. Our results show that the injection orifice surely has a great scale
effect on the transversal injection field in cold kerosene-fueled supersonic flows. Our findings show that the
penetration depth, span angle and span expansion area of the transverse cavity jet are increased with the injection
diameter, and that the kerosene droplets are more prone to breakup and atomization at the outlet of the combustor for
the orifice diameter of 1.5mm. The calculation predictions are compared against the reported experimental
measurements and literatures with good qualitative agreement. The simulation results obtained in this study can
provide the evidences for better understanding the underlying mechanism of kerosene atomization in cold supersonic
flow and scramjet design improvement.