TRANSVERSE JET MIXING AND COMBUSTION EXPERIMENTS IN HYPERVELOCITY FLOWS

Transverse jet mixing and combustion experiments at a freestream veloc ity of 5 km/s have been conducted in the T5 free-piston shock tunnel a t GALCIT, The experiments were performed in a 50 by 25 mm combustor mo del using a flush-mounted, Math 1.7 single injector introducing the fu el at an angle of 15 deg relative to the main flow, The test condition s cover a range of freestream pressures from low values chosen to matc h previous experiments with the same duct in the HYPULSE expansion tub e facility at GASL, to high pressures corresponding to the conditions closer to those in a real scramjet combustor, Tests with cold and hot hydrogen fuel were performed, the latter to better reproduce the fuel conditions of a scramjet propulsion system where the hydrogen will hav e to be used first as a cooling fluid. A small combustion-driven shock tunnel was used simultaneously with T5 to supply to hot fuel.