Abstract
A special supersonic nozzle that features five swept ramps on its expansion side, called the RAMP nozzle, was used to enhance Mach 2 jet mixing with the surrounding air either at rest or flowing at Mach 1.3. The total pressure profiles of the supersonic jets were measured at several streamwise stations and the initial shearlayer growth rates were deduced from the measurements. The results showed that the special growth rate was significantly increased with the RAMP nozzle in comparison with axisymmetric supersonic jets discharging from reference circular nozzles. The increase was 44% at the convective Mach number of 0.23 and 110% at 0.86. Also, the supersonic jets were visualized using a planar Mie-scattering technique. Instantaneous images of the RAMP-expanded-jet showed large-scale well-organized structures that resembled axial vortices in the shear layers. The appearance of these structures was linked to the increase in the initial shear-layer growth rate. Lastly, for an afterburning fuel-rich supersonic jet, the RAMP nozzle changed the afterburning characteristics significantly. This suggests that the supersonic mixing is affected.
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