Journal ArticleDOI
Counterflow thrust vectoring of supersonic jets
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In this article, a supersonic rectangular jet having a 4 : 1 aspect ratio and for jet stagnation temperatures between 300 and 670 K was examined for controllable thrust vector control using counterflow.Abstract:
Fluidic thrust vector control is examined in a supersonic rectangular jet having a 4 :1 aspect ratio and for jet stagnation temperatures between 300 and 670 K. Experiments conducted in a nominally ideally expanded Mach 2 jet reveal that thrust can be continuously vectored up to at least 16 deg by creating a secondary counterflowing stream between the primary jet and an adjacent curved surface. Thrust vector control using counterflow is shown to be effective in both cold and moderately heated supersonic jets and to perform free of bistable or hysteretic effects. Measurements indicate that proportional thrust vector control can be achieved with less than 4% thrust loss and requiring secondary mass flow rates less than approximately 2% of the primary jet.read more
Citations
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Journal ArticleDOI
Flow control with noncircular jets
TL;DR: Noncircular jets have been identified as an efficient technique of passive flow control that allows significant improvements of performance in various practical systems at a relatively low cost because noncircular jet rely solely on changes in the geometry of the nozzle as discussed by the authors.
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Bifurcating and blooming jets
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Proceedings ArticleDOI
Periodic Excitation for Jet Vectoring and Enhanced Spreading
G Pack LaTunia,Seifert Avi +1 more
TL;DR: The effects of periodic excitation on the evolution of a turbulent jet were studied experimentally in this article, where a short, wide-angle diffuser was attached to the jet exit and excitation was introduced at the junction between the jet exiting and the diffuser inlet.
Book
Planar velocity measurements in compressible mixing layers
William D. Urban,M. G. Mungal +1 more
TL;DR: In this article, particle image velocimetry (PIV) was used to obtain planar, two-component velocity fields in two-dimensional, turbulent mixing layers at convective Mach numbers Mc of 0.25, 0.63, and 0.76.
Proceedings ArticleDOI
Experimental Study of a Nozzle Using Fluidic Counterflow for Thrust Vectoring
TL;DR: In this paper, a static experimental investigation of a counterflow thrust vectoring nozzle concept was performed in the NASA Langley Research Center Jet Exit Test Facility, where the effects of suction collar geometry and suction slot height on nozzle performance were examined.
References
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Journal ArticleDOI
A planar Mie scattering technique for visualizing supersonic mixing flows
Noel T. Clemens,M. G. Mungal +1 more
TL;DR: In this paper, a planar Mie scattering technique is described for the direct visualization of fluid mixing in supersonic flows, which reveals details of the turbulent structure which are masked by the spatial integration of schlieren and shadowgraph methods.
Journal ArticleDOI
The effect of counterflow on the development of compressible shear layers
TL;DR: In this paper, a compressible countercurrent shear layer was investigated experimentally by establishing reverse flow around the perimeter of a supersonic jet and the results showed that spatial growth rates of the countercurrent layer significantly exceed those of the classical co-flowing layer at comparable density ratios and levels of compressibility.
Journal ArticleDOI
Mixing enhancement due to global oscillations in jets with annular counterflow
TL;DR: In this paper, a self-excited global oscillation is established in the axisymmetric jet by applying suction to an annular cavity placed around the jet periphery.