MIXING ENHANCEMENT USING AXIAL FLOW
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applied to a coaxial jet with primary flow composed of a helium-air mixture at Mach 0.9.
Jet Mach number=0.9
Jet velocity=465 m/s
Jet Reynolds number =180,000
These experiments suggest that the exhaust of a turbofan engine can mix faster by making a minor change in the shape of the fan duct. See also experiments at larger bypass ratio.
*NPR=Nozzle pressure ratio: total pressure over ambient pressure. NPR=1.89 gives sonic fully-expanded Mach number
**Bypass ratio= Coflow mass flow rate over jet mass flow rate.
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