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Flow enthalpy effects on scramjet mixing and combustionThe present analysis of the 3D characteristics of the mixing processes in a scramjet combustor gives attention to the streamwise, vorticity-driven macromixing, as well as shear-driven small-scale mixing, in both an unconfined Mach 6 airstream and a high-enthalpy (Mach-17) confined, Mach 6 airstream. The results obtained indicate that mixing is substantially lower for the high-enthalpy case. The effect of residence time on jet mixing is discussed in view of the production and decay of the axial vorticity, cross-flow velocities, and mean-flow velocities of these confined flows. The effective distance travelled by a fluid particle in the cross-flow, over the combustor length, is used to explain axial vorticity's contribution to mixing.
Document ID
19930038370
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Riggins, D. W.
(Missouri-Rolla Univ. Rolla, United States)
Mcclinton, C. R.
(NASA Langley Research Center Hampton, VA, United States)
Rogers, R. C.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
December 1, 1992
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 92-5097
Meeting Information
Meeting: AIAA, International Aerospace Planes Conference
Location: Orlando, FL
Country: United States
Start Date: December 1, 1992
End Date: December 4, 1992
Sponsors: AIAA
Accession Number
93A22367
Distribution Limits
Public
Copyright
Other

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