PSP and PIV investigations on the VFE-2 configuration in sub- and transonic flow

Authors:  Robert Konrath, Christian Klein, Andreas Schröder

Abstract:
An overview is given about investigations on a 65◦ delta wing using the Pressure Sensitive Paint (PSP) and Particle Image Velocimetry (PIV) techniques, carried out in the framework of the International Vortex Flow Experiment 2 (VFE-2). For the delta wing with rounded leading edges and subsonic flow, the occurrence of a flat vortical structure as well as the onset of the primary vortex and the development of a vortex system consisting of an inner and outer vortex is described in dependency of the angle of attack and the Reynolds number. The Q -criterion is applied to the measured velocity data to estimate the circulation strength of individual vortices allowing for a quantitative description of the vortex developments and interactions. Furthermore, a case at transonic flow speeds (M = 0.8) is described, showing a sudden occurrence of vortex breakdown above the delta wing, most probably induced by a shock wave.

Keywords:
Vortex flow
Delta wing
Blunt leading edge
PIV
PSP
VFE-2

Published in: Aerospace Science and Technology  (Volumes 24, Issue 1, January -  February, 2013)

Publisher: Elsevier

ISSN Information: 1270-9638

PSP and PIV investigations on the VFE-2 configuration in sub- and transonic flow

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