Undulated nozzle for enhanced exit area mixing

Details Undulated nozzle for enhanced exit area mixing Undulated nozzle for enhanced exit area mixing

1997-05-02

2000-07-04

Weldon, Kevin

Fluid sprinkling, spraying, and diffusing

Reaction motor discharge nozzle

With means controlling amount, shape or direction of...

239464, B63H 1110

Patent

active

060826355

ABSTRACT:
A nozzle having an undulating surface for enhancing the mixing of a primary flow with a secondary flow or ambient air, without requiring an ejector. The nozzle includes a nozzle structure and design for introducing counter-rotating vorticity into the primary flow either through (i) internal surface corrugations where an axisymmetric line through each corrugation is coincident with an axisymmetric line through the center of the flow passageway or (ii) through one or more sets of alternating convexities and cavities in the internal surface of the nozzle where an axisymmetric line through each convexity and cavity is coincident with an axisymmetric line through the center of the flow passageway, and where the convexities contract from the entrance end towards the exit end. Exit area mixing is also enhanced by one or more chevrons attached to the exit edge of the nozzle. The nozzle is ideally suited for application as a jet engine nozzle. When used as a jet engine nozzle, noise suppression with simultaneous thrust augmentation/minimal thrust loss is achieved.

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Seiner, John M., et al., "Supersonic Jet Noise and the High Speed Civile Transport", AIAA-89-2358, Jul. 10-12, 1989, 24 pgs.
Presz, Walter M., Jr., "Mixer/Ejector Noise Suppressors", AIAA-91-2243, Jun. 24-26, 1991, 11 pgs.
Ahuja, K. K., "Mixing Enhancement and Jet Noise Reduction Through Tabs Plus Ejectors", AIAA-93-4347, Oct. 25-27, 1993, 15 pgs.
Krothapalli, A. et al, "The Role of Streamwise Vortices on Sound Generation of a Supersonic Jet", AIAA 93-4320; Oct. 25-27, 1993; 11 pgs.
Seiner, John M. et al., "Nozzle Thust Optimizationn While Reducing Jet Noise", CEAS/AIAA-95-149; Jun. 12-15, 1995; 22 pgs.
Seiner, J. et al., "Nozzle Thrust Optimzation While Reducing Jet Noise", AIAA 95-2191; Jun. 19-22, 1995; 27pgs.
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