Mixing characteristics of supersonic shrouded jets
Abstract
The entrainment characteristics of elliptic and rectangular jets, confined in a circular shroud, were compared to a circular shrouded jet. The entrainment ratio was determined in a closed shroud configuration and in an open shroud, for a Mach number range of 1 to 2.4. In the closed shroud, the pressure depression resulting from the jet entrainment was measured. In the open shroud, the velocity of the entrained secondary flow was measured in the shroud inlet. The measurements were done for different shroud diameters and lengths. The rectangular and elliptic primary jet gave a considerable improvement relative to the circular jet. The entrainment ratio increased with the duct length and the area ratio between the duct and the primary nozzle. The variation of the secondary flow velocity and the pressure depression with the primary jet Mach number was irregular and was shown to be related to the jet mode structure and to the duct acoustics.
- Publication:
-
26th AIAA Aerospace Sciences Meeting
- Pub Date:
- January 1988
- Bibcode:
- 1988aiaa.meetQW...W
- Keywords:
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- Flow Characteristics;
- Jet Mixing Flow;
- Supersonic Jet Flow;
- Blowdown Wind Tunnels;
- Entrainment;
- Pressure Distribution;
- Secondary Flow;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer