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Effect of Wedge-Shaped Deflectors on Flow Fields of Dual-Stream Jets

Shupe, Rebecca S. and Zaman, Khairul B. and Papamoschou, Dimitri (2007) Effect of Wedge-Shaped Deflectors on Flow Fields of Dual-Stream Jets. In: 13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference), 21-23 May 2007, Rome, Italy.

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The effect of wedge-shaped fan flow deflectors on the mean and turbulent flow-fields of dual-stream jets is investigated. Several wedge-shaped deflector concepts were used to create asymmetry in the plume of a dual-stream jet issuing from a scaled down version of the NASA Glenn ‘5BB’ bypass-ratio 8 turbofan nozzle. The deflector configurations comprised internal and external wedges with and without a pylon. Some external wedges incorporated local extensions of the fan nacelle. All the deflectors reduced radial velocity gradients, magnitudes of peak Reynolds stresses, and peak turbulent kinetic energy beneath the jet centerplane, with an increase above the jet centerplane. A correlation was obtained between the maximum radial velocity gradient and the peak turbulent kinetic energy in the dominant noise source region.

Item Type:Conference or Workshop Item (Paper)
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Additional Information:Acknowledgments We would like to acknowledge the diligent work of Jeff Hamman in preparing the jet facility for the experiments. Thanks are due to Henry Haskins of NASA LARC for help with the pylon design. The first author would like to acknowledge the NASA Graduate Student Researchers Program (GSRP) fellowship, which facilitated this research opportunity.
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NNASA Graduate Student Researchers Program (GSRP) fellowshipUNSPECIFIED
Subject Keywords:jet noise reduction, turbulent kinetic energy, fan flow deflection, mean flow gradient, asymmetric dual-stream jets
Record Number:CaltechAUTHORS:20091102-203612129
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16547
Deposited By: Rebecca Shupe
Deposited On:03 Nov 2009 21:45
Last Modified:03 Oct 2019 01:13

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