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An Investigation of Temperature Fluctuations on Bluff Bodies


Gorecki, Jacek Piotr (1960) An Investigation of Temperature Fluctuations on Bluff Bodies. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/KV3S-CJ64.


Temperature fluctuations and recovery temperatures on the surface of a circular cylinder (with axis normal to a subsonic compressible flow) and the field of flow about the cylinder, particularly the wake area, are investigated experimentally in range between M = 0.35, Re = 117,000 and M = 0.70, Re = 201,000. Spectral analysis of fluctuations on body surface and other evidence indicate that formation of discrete vortex cores from the separated shear layers is initially an impulsive random process (of the generalized "shot effect" type), although the wake farther downstream from the model has a definitely periodic structure. Impulsive formation of vortex cores can be enhanced by wind tunnel resonance or by a high turbulence level in the free stream and is accompanied by abnormal cooling of the model surface in the separated area - the mechanism of these effects is also investigated.

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):
  • Liepmann, Hans Wolfgang
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1960
Record Number:CaltechETD:etd-02242006-083641
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:736
Deposited By: Imported from ETD-db
Deposited On:02 Mar 2006
Last Modified:23 Oct 2023 22:30

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PDF (Gorecki_jp_1960.pdf) - Final Version
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