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Test section streaks originating from imperfections in a zither located upstream of a contraction

Published online by Cambridge University Press:  15 December 2015

David A. Pook ,
Jonathan H. Watmuff  and
Adrian C. Orifici
David A. Pook*
Affiliation:
School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Bundoora, VIC 3083, Australia
Jonathan H. Watmuff
Affiliation:
School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Bundoora, VIC 3083, Australia
Adrian C. Orifici
Affiliation:
School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Bundoora, VIC 3083, Australia
*
†Email address for correspondence: [email protected]
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Abstract

Defining a link between wind-tunnel settling chamber screens, flow quality and test section boundary-layer spanwise variation is necessary for accurate transition prediction. The aim of this work is to begin establishing this link. The computed, steady, laminar wake of a zither (screen model) with imperfect wire spacing is tracked through a contraction and into a model test section. The contraction converts the zither wake into streamwise vorticity which then creates spanwise variation (streaks) in the test-section boundary layer. The magnitude of the spanwise variation is sensitive to the zither open-area ratio and imperfections, but the observed wavelength is relatively insensitive to the zither wire spacing. Increased spanwise variation is attributed to large wavelength variation of drag across the zither, and not the coalescence of jets phenomena. The linear stability of the streaks is predicted using the parabolized stability equations with the $\text{e}^{N}$ method. A standard deviation of zither wire position error of 38.1 ${\rm\mu}$m (15 % of wire diameter) for a zither of 50 % open-area ratio is found to suppress Tollmien–Schlichting wave growth significantly.

JFM classification

Boundary Layers: Boundary Layers Boundary Layers: Boundary layer stability Wakes/Jets: Wakes
Type
Papers
Information
Journal of Fluid Mechanics , Volume 787 , 25 January 2016 , pp. 254 - 291
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© 2015 Cambridge University Press 

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