Abstract
An investigation of sonic transverse injection from circular and elliptic nozzles into a supersonic crossflow using planar Rayleigh/Mie scattering is reported. Instantaneous images allow examination of the structural details, whereas ensemble-averaged images provide transverse penetration and lateral spread data for each jet. Standard deviation images produce information regarding the large-scale mixing/entrainment and reveal the mixing zones. Results show a highly three-dimensional near-field interaction dominated by shear-layer eddies and a counter-rotating vortex pair. Ensemble-averaged results show that the elliptic jet spreads more rapidly in the lateral direction than the circular jet, confirming that an axis-switching phenomenon is present. Near-field transverse penetration data collapse well with low-speed scaling conventions; however, the jet produced by the elliptic nozzle suffers a 20% reduction in penetration compared to the circular jet. Compressibility level does not play a significant role in the average penetration or spread of these jets, although it strongly affects the mixing/entrainment and large-scale structure. Analysis of mixing potential from the standard deviation images indicates that the low and high convective Mach number Mc injection cases are significantly different; low Mc injection yields better large-scale mixing potential than high Mc injection regardless of the injector geometry.
Original language | English (US) |
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Pages (from-to) | 449-457 |
Number of pages | 9 |
Journal | Journal of Propulsion and Power |
Volume | 16 |
Issue number | 3 |
DOIs | |
State | Published - 2000 |
ASJC Scopus subject areas
- Aerospace Engineering
- Fuel Technology
- Mechanical Engineering
- Space and Planetary Science