Abstract
Spray jet in cold kerosene-fueled supersonic flow has been characterized under different injection pressures to
assess the effects of the pressure variation on the mixing between incident shock wave and transverse cavity injection.
Based on the real scramjet combustor, a detailed computational fluid dynamics model is developed. The injection
pressures are specified as 0.5, 1.0, 2.0, 3.0 and 4.0 MPa, respectively, with the other constant operation parameters
(such as the injection diameter, angle and velocity). A three dimensional Couple Level Set & Volume of Fluids
approach incorporating an improved Kelvin-Helmholtz & Rayleigh-Taylor model is used to investigate the interaction
between kerosene and supersonic air. The numerical simulations primarily concentrate on penetration depth, span
expansion area, angle of shock wave and sauter mean diameter distribution of the kerosene droplets with/without
evaporation. Validation has been implemented by comparing the calculated against the measured in literature with
good qualitative agreement. Results show that the penetration depth, span-wise angle and expansion area of the
transverse cavity jet are all increased with the injection pressure. However, when the injection pressure is further
increased, the value in either penetration depth or expansion area increases appreciably. This study demonstrates the
feasibility and effectiveness of the combination of Couple Level Set & Volume of Fluids approach and an improved
Kelvin-Helmholtz & Rayleigh-Taylor model, in turn providing insights into scramjet design improvement.