- Facilities
Tests
MESPI in Mach 1.5 perfectly-expanded jet
MESPI in underexpanded air jet
MESPI in He/Air jet (small coflow)
MESPI in He/Air jet (large coflow)
JSE in He/Air jet (small)
JSE in He/Air jet (large)
JSE applied to an annular jet composed of a helium-air mixture at Mach 0.9.
Jet Mach number=0.9 (NPR*=1.75)
Jet velocity=410 m/s
Jet Reynolds number =28,000 (based on annulus thickness)
Inner annulus diameter=0.5 in.
Outer annulus diameter=0.7 in.
See also results for a larger annular jet
 Annular nozzle is convergent. |
 Annular nozzle is convergent-divergent (Ae/Amin=1.25). This is the JSE condition; the jet destabilization is obvious. This configuration could simulate the core exhaust of a turbofan or turbojet engine. |
 Centerline Mach number versus axial distance for the cases presented above. Red: jet from convergent nozzle; Green: jet from convergent-divergent nozzle. Faster decay of centerline Mach number indicates mixing enhancement. |
*NPR=Nozzle pressure ratio: total pressure over ambient pressure. NPR=1.89 gives sonic fully-expanded Mach number