The effect of angle of attack on the flow structure over the nonslender lambda wing

Authors:   S. Yayla, C. Canpolat, B. Sahin, H. Akilli

Abstract:
The aim of the current study at first stage is to demonstrate the general flow structure qualitatively using the dye visualization technique. Secondly, the instantaneous flow data taken by a Stereoscopic Particle Image Velocimetry (stereo-PIV) over a stationary nonslender lambda wing is used to determine the time-averaged flow topology in order to provide detailed information about crucial events like formation of leading edge vortices and vortex breakdown in plan-view planes and cross-flow planes. The flow structure close to the lambda wing surface and development of the vortex breakdown are investigated as functions of angles of attack within the range of 7◦ α 17◦. Experimental analyses are composed of time-averaged patterns of streamlines, vorticity contours, transverse and streamwise velocity components, Reynolds-stress correlations, distribution of fluctuating velocities, and turbulent kinetic energy. Results show that the angle of attack has a substantial influence on the flow behavior on the nonslender lambda wing surface.

Keywords:
Angle of attack
Lambda wing
PIV
Turbulent statistics

Published in: Aerospace Science and Technology  (Volumes 28, Issue 1, July 2013)

Publisher: Elsevier

ISSN Information: 1270-9638

The effect of angle of attack on the flow structure over the nonslender lambda wing

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