NDLI: Experimental Study of Stream-Wise Vortex Formation on Swept Circular Cylinders in Cross-Flow

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Allan, W. D. E. Gostelow, J. P. Simon, I. Hogg
Copyright Year	2015
Abstract	A series of experiments has been undertaken on a swept cylinder in cross-flow in the 2m2 open-jet wind-tunnel at Durham University, at a nominal Reynolds Number of 500,000. Boundary layer instability, leading to transition has been attributed to curious sheets of stream-wise vortices on turbomachinery blades and other airfoils. Cylinders in cross-flow can be scaled to model such flows. Empirical analysis of stream-wise vortex pair spacing on cylinders was proposed in 1970 and various researchers have produced experimental data sets at various Reynolds Numbers and sweep ranges. Oil flow visualization was conducted in this work, the goal of which was to fill an important gap in experimental results, a gap of significance to turbine blade designers amongst others. In this test campaign, clear evidence of stream-wise vortices was exposed, the wavelengths of which compared well with the experimental results of others and with theory, although interesting departures were observed at high sweep angles. A physical explanation for the formation of the vortex and pair spacing, particularly at higher sweeps, is proposed.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856635
DOI	10.1115/GT2015-43847
Volume Number	Volume 2A: Turbomachinery
Conference Proceedings	ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2015-06-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Turbine blades Blades Wind tunnels Reynolds number Airfoils Turbomachinery Flow (dynamics) Circular cylinders Wavelength Cross-flow Vortices Flow visualization Boundary layers Cylinders
Content Type	Text
Resource Type	Article

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