Round Jets Injected into Compressible Crossflows
Professors Ann R. Karagozian and Owen I. Smith; MAE
This experimental and theoretical study (completed) is directed
towards a better understanding of the penetration and mixing of
transverse jet injected into crossflows. Analytically oriented models
have been developed emphasizing the the dynamics of the vortical
structures observed to dominate the cross-section of transverse
jets injected into a crossflow of the same phase. Model results
are compared with experimental jet trajectories. Recent experimental
measurements are concentrated in the transonic regime, where no
previous measurements exist.
An iodine seeded nitrogen jet emanates from a flight
test fixture attached beneath a NASA F104G aircraft. The jet
is oriented normal to M=0.6-1.8 crossflows formed by the freestream
surrounding the flight test fixture. The resulting trajectories
are visualized in flight by planar laser-induced fluorescence of
iodine. Measurements involving injection into uniform crossflows
and injection behind rearward facing steps have been completed.
The principal applications of this work is in optimizing the mixing
of fuel jets in supersonic combustions. The planar laser-induced
flow visualization apparatus developed for this project is now being
applied to mixing studies.
Sponsors: NASA Dryden
- Transverse Gas Jet Injection Behind a Rearward-Facing
Step , A.R. Karagozian, K.C. Wang, A.T. Le, and O.I.
Smith, J. Propulsion and Power, 12, 1129-1136, 1996.
- In-Flight Imaging of Gas Jets Injected into Subsonic
and Supersonic Crossflows , C. Wang, O.I. Smith and A.R.
Karagozian, AIAA Journal, 33, 2259-2263, 1995.
- Gaseous Jet in Supersonic Crossflow, S.D. Heister
and A.R. Karagozian, AIAA J, 28, 819-827, 1990.
- Vortex Modeling of Gaseous Jets in a Compressible Crossflow,
S.D. Heister, and A.R. Karagozian, J Propul and Power, 6,