Effect of shear-layer control on leading-edge vortices

1996 ◽  
Vol 33 (6) ◽  
pp. 1087-1093 ◽  
Author(s):  
S. McCormick ◽  
I. Gursul
Keyword(s):  
Shear Layer ◽  
Leading Edge ◽  
Layer Control ◽  
Leading Edge Vortices

Vortical substructures in the shear layers forming leading-edge vortices

AIAA Journal ◽  
2002 ◽  
Vol 40 ◽  
pp. 1689-1692 ◽  
Author(s):  
A. M. Mitchell ◽  
P. Molton
Keyword(s):  
Leading Edge ◽  
Shear Layers ◽  
Leading Edge Vortices

Countercurrent shear layer control of flame stabilization

1997 ◽  
Author(s):  
E. Koc-Alkislar ◽  
L. Lourenco ◽  
A. Krothapalli ◽  
P. Strykowski ◽  
E. Koc-Alkislar ◽  
...  
Keyword(s):  
Shear Layer ◽  
Flame Stabilization ◽  
Countercurrent Shear ◽  
Layer Control

Scaling the vorticity dynamics in the leading-edge vortices of revolving wings with two directional length scales

2020 ◽  
Vol 32 (12) ◽  
pp. 121903
Author(s):  
Nathaniel H. Werner ◽  
Junshi Wang ◽  
Haibo Dong ◽  
Azar Eslam Panah ◽  
Bo Cheng
Keyword(s):  
Leading Edge ◽  
Length Scales ◽  
Vorticity Dynamics ◽  
Leading Edge Vortices

Vibration reduction of a sphere through shear-layer control

2021 ◽  
Vol 105 ◽  
pp. 103325
Author(s):  
Thomas McQueen ◽  
Jisheng Zhao ◽  
John Sheridan ◽  
Mark C. Thompson
Keyword(s):  
Shear Layer ◽  
Vibration Reduction ◽  
Layer Control

The effect of a 70 deg swept canard on the leading-edge vortices of a 70 deg swept delta wing during dynamic pitching

1997 ◽  
Author(s):  
Shigeo Hayashibara ◽  
Roy Myose ◽  
L. Miller ◽  
Shigeo Hayashibara ◽  
Roy Myose ◽  
...  
Keyword(s):  
Delta Wing ◽  
Leading Edge ◽  
Leading Edge Vortices

Tip Leakage Flow Instability in a Centrifugal Compressor

2021 ◽  
Vol 143 (4) ◽  
Author(s):  
Teng Cao ◽  
Tadashi Kanzaka ◽  
Liping Xu ◽  
Tobias Brandvik
Keyword(s):  
Shear Layer ◽  
Centrifugal Compressor ◽  
Large Scale ◽  
Flow Instability ◽  
Leading Edge ◽  
Main Stream ◽  
Leakage Flow ◽  
Tip Leakage Flow ◽  
Unstable Flow ◽  
Tip Leakage

Abstract In this paper, an unsteady tip leakage flow phenomenon is identified and investigated in a centrifugal compressor with a vaneless diffuser at near-stall conditions. This phenomenon is associated with the inception of a rotating instability in the compressor. The study is based on numerical simulations that are supported by experimental measurements. The study confirms that the unstable flow is governed by a Kelvin–Helmholtz type instability of the shear layer formed between the main-stream flow and the tip leakage flow. The shear layer instability induces large-scale vortex roll-up and forms vortex tubes, which propagate circumferentially, resulting in measured pressure fluctuations with short wavelength and high amplitude which rotate at about half of the blade speed. The 3D vortex tube is also found to interact with the main blade leading edge, causing the reduction of the blade loading identified in the experiment. The paper also reveals that the downstream volute imposes a once-per-rev circumferential nonuniform back pressure at the impeller exit, inducing circumferential loading variation at the impeller inducer, and causing circumferential variation in the unsteady tip leakage flow.

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