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Measurements of Fluctuating Air Loads on a Circular Cylinder


Schmidt, Louis Vincent (1963) Measurements of Fluctuating Air Loads on a Circular Cylinder. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/8714-PJ73.


Measurements were made of the unsteady air loads, both lift and drag, developed on a circular cylinder when exposed to flow in the supercritical Reynolds number range from 0.38 x 106 to 0.75 x 106. The three dimensional nature of the flow, which is a consequence of the flow separation effects, is recognized. The statistical character of spatially varying random type fluctuating air loads is presented in the form of cross-spectral densities and cross-correlation coefficients. Information of this type has application to the problem of determining the response of a cylindrical structure when exposed to air loads.

The extreme sensitivity of the flow to surface irregularities in the supercritical Reynolds number region is reported including the effects upon the local and spatial character of the fluctuating loads. Local values of steady state lift could be induced by suitably orienting surface disturbances on the forward portion of the cylinder.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Aeronautics)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Fung, Yuan-cheng
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1963
Additional Information:Title varies in the 1963 Caltech commencement program: Air Loads on a Circular Cylinder
Record Number:CaltechETD:etd-06102008-110237
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2543
Deposited By: Imported from ETD-db
Deposited On:10 Jun 2008
Last Modified:04 Jan 2024 21:24

Thesis Files

PDF (Schmidt_lv_1963.pdf) - Final Version
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