Blackiston, Harry Spencer (1963) Tip effects on fluctuating lift and drag forces acting on a circular cylinder perpendicular to an air flow. Engineer's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-12072005-135116
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Tests were conducted to evaluate the tip effects on the local air loads that act on a circular cylinder normal to a flow at Reynolds numbers, based on cylinder diameter, of 0.38 x [...], 0.53 x [...], 0.65 x [...] and 0.75 x [...] (corresponding to wind tunnel dynamic pressures of 10, 20, 30, and 40 psf, respectively). Tip configurations consisted of a blunt-end (or smokestack), a hemisphere, a 15 degree half-angle cone, and an ellipsoid with semi-major axis of 1.5 cylinder diameters. Localized boundary layer tripping facilitated controlled disturbances near the tip.
Unsteady lift and drag were significantly altered by the hemispherical and ellipsoidal ends as compared with the blunt-end. In contrast, the conical tip showed much smaller changes. Local lift and drag coefficients, as well as cross-correlation coefficients, vary rapidly along the cylinder axis near the tip.
The importance of boundary layer characteristics on the fluctuating forces was demonstrated by boundary layer tripping with air blowing out through suitably located orifices in the cylinder.
|Item Type:||Thesis (Engineer's thesis)|
|Degree Grantor:||California Institute of Technology|
|Division:||Engineering and Applied Science|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 January 1963|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||08 Dec 2005|
|Last Modified:||26 Dec 2012 03:12|
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