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TECHNICAL PAPERS

Vectoring Thrust in Multiaxes Using Confined Shear Layers

[+] Author and Article Information
F. S. Alvi, A. Krothapalli

Florida A&M University and Florida State University, Tallahassee, FL 32310

P. J. Strykowski, D. J. Forliti

University of Minnesota, Minneapolis, MN 55455

J. Fluids Eng 122(1), 3-13 (Dec 07, 1999) (11 pages) doi:10.1115/1.483220 History: Received March 22, 1999; Revised December 07, 1999
Copyright © 2000 by ASME
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References

Figures

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Schematics of the (a) side view and (b) end views of a counterflow thrust vector nozzle
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Shadowgraph images of the side view of a Mach 2 jet operating at To=300 K: (a) jet vectored at ∼5 deg; (b) jet vectored at ∼10 deg; and (c) jet vectored at ∼15 deg
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(a) Pressure distributions along collar surfaces and jet deflection measured within jet potential core. (b) Iso-velocity contours obtained using PIV at the same conditions as in (a), where M=2,To=300 K,G/H=0.38.
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Counterflow thrust vector performance as a function of slot pressure in the secondary stream. (a) Secondary mass flow requirements; (b) thrust vector angles; (c) thrust coefficient. Conditions correspond to M=2 for cold jets (open symbols, To=300 K) and hot jets (solid symbols, To=670 K).
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Planar laser scattering images of jet cross section at x/D≈2.5 for (a) unvectored jet and (b) jet vectored into uppermost sector; pG/pa=0.51
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Planar laser scattering images of the side view of a Mach 2 axisymmetric jet: (a) unvectored, and (b) vectored into the uppermost sector; pG/pa=0.51
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Performance of counterflow thrust vectoring of axisymmetric and rectangular nozzles at Mach 2
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Pressure response for jet deflections between (a) 0 and 10 deg, and (b) 10 and 0 deg. Uncertainty in time is ±0.003 s; uncertainty in normalized pressure is ±0.01.
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Schematic of pitch vectoring hardware in the presence of coflow
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Pressure distributions on the collar and coflow duct surfaces for a primary Mach number of 1.4 and a coflow Mach number of 0.3. Uncertainty in x/H is ±0.05.
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Performance of counterflow thrust vectoring in a rectangular nozzle with coflow

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