Passive Shear Layer Regularization Experiments in Wind Tunnels and Feed-Forward Adaptive-Optic Correction

2009 ◽  
Author(s):  
Donald Wittich ◽  
Daniel Duffin ◽  
Eric Jumper ◽  
Alan Cain ◽  
Edward Kerschen
Keyword(s):  
Shear Layer ◽  
Adaptive Optic ◽  
Wind Tunnels ◽  
Feed Forward

Feedforward Adaptive-Optic Correction of a Compressible Shear Layer Using a Laser Beacon

2010 ◽  
Author(s):  
Mark Rennie ◽  
David Goorskey ◽  
Matthew Whiteley ◽  
David Cavalieri ◽  
Eric Jumper
Keyword(s):  
Shear Layer ◽  
Adaptive Optic

Practical considerations for ray casting shear layer corrections

2021 ◽  
pp. 1475472X2110526
Author(s):  
Todd Schultz
Keyword(s):  
Shear Layer ◽  
Ray Tracing ◽  
Acoustic Waves ◽  
Phased Arrays ◽  
Acoustic Propagation ◽  
Wind Tunnels ◽  
Computational Time ◽  
Propagation Time ◽  
Ray Casting ◽  
Casting Method

Aircraft noise reduction technology development has been aided by the use of acoustic phased arrays to identify component-level locations of noise sources. Acoustic phased arrays are commonly used in both closed-wall and open-jet wind tunnels, thus requiring accurate acoustic propagation models to focus the array. In particular, open-jet wind tunnels have complex flow fields including a free shear layer that the acoustic waves must propagate through. A method using ray tracing is reviewed and an enhancement proposed to reduce the computational time for cases requiring a large number of rays. The proposed reduced ray casting method uses ray tracing to the extreme edges of the region of interest and limits all casted acoustic rays to within that region. The results showed that a hemispherical spiral discretization had lower error in the estimated acoustic propagation time than uniform angular discretization. The proposed reduced ray casting method showed similar accuracy as the original ray casting method but with improvement in the computational times when the number of cast rays was greater than 3200 as needed for modeling acoustic propagation in larger industrial sized open-jet wind tunnels.

scholarly journals Adaptive-Optic Correction of a Regularized Compressible Shear Layer

2006 ◽  
Author(s):  
Alice Nightingale ◽  
Daniel Duffin ◽  
Michael Lemmon ◽  
Bill Goodwine ◽  
Eric Jumper
Keyword(s):  
Shear Layer ◽  
Adaptive Optic

Evaluation of Laser Beacon for Adaptive-Optic Correction of a Compressible Shear Layer

AIAA Journal ◽  
2013 ◽  
Vol 51 (4) ◽  
pp. 1008-1011 ◽  
Author(s):  
R. Mark Rennie ◽  
David Goorskey ◽  
Matthew R. Whiteley ◽  
David Cavalieri ◽  
Eric J. Jumper
Keyword(s):  
Shear Layer ◽  
Adaptive Optic

scholarly journals Phase-Locked-Loop Adaptive-Optic Controller and Simulated Shear Layer Correction

AIAA Journal ◽  
2013 ◽  
Vol 51 (11) ◽  
pp. 2714-2726 ◽  
Author(s):  
Alice M. Nightingale ◽  
Bill Goodwine ◽  
Michael Lemmon ◽  
Eric J. Jumper
Keyword(s):  
Shear Layer ◽  
Phase Locked Loop ◽  
Adaptive Optic

Speed control of large wind tunnels

1958 ◽  
Vol 4 (39) ◽  
pp. 146-147
Author(s):  
L.S. Drake ◽  
J.A. Fox ◽  
G.H.A. Gunnell
Keyword(s):  
Speed Control ◽  
Wind Tunnels ◽  
Large Wind
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