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Experimental heat transfer at hypersonic mach mumber

Citation

DeLauer, Richard D. (1953) Experimental heat transfer at hypersonic mach mumber. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-04222003-111626

Abstract

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An experimental investigation was conducted in Leg 1 of the GALCIT 5 x 5 inch Hypersonic Wind Tunnel to determine the heat transfer coefficients of the laminar boundary layer on a cooled flat plate at a nominal Mach number of 5.8. As a consequence of the investigation, flat plate recovery factors were determined and the effect of condensation on heat transfer was noted. In addition qualitative results as to the laminar boundary layer transition and separation are also presented.

The tests were conducted with a ratio of wall temperature to free stream temperature (T[subscript w]/T[delta]) of approximately 6.2; but under stagnation temperature conditions ranging from 200[degrees]F to 285[degrees]F. The stagnation pressure range of 60 psia to 115.5 psia provided a maximum Reynolds number of 2.1 x 10[superscript 6].

A flat plate temperature recovery factor of .858 [plus or minus] .004 was determined, and it was concluded that the temperature recovery factor range of Mach number independence could be extended to a Mach number of 5.8. The independence of the recovery factor on Reynolds number up to the beginning of the laminar boundary layer transition was also substantiated.

The heat transfer coefficients were obtained for a negative temperature gradient over a considerable portion of the plate. The effect of these gradients produced values considerably higher than would be expected for an isothermal surface. These results, when related the constant temperature case by a theoretical calculation, were in good agreement, with the theoretical results and the results of a friction investigation carried out at the same Mach number. The accuracy of the results was estimated to be [plus or minus]10% from a value of Nu/Re[superscript 1/2]Pr[superscript 1/3] = .285. There was no apparent effect on the heat transfer coefficient by condensation, but the adiabatic wall temperature appeared to be 2% lower than for the condensation free flow. Due to a step increase in thickness of the model at the ten inch station, the shock wave-boundary layer interaction appears to produce laminar boundary layer transition at a Reynolds number of 1.3 x 10[superscript 6], and upon reducing the Reynolds number further, the transition point is subjected to an adverse pressure gradient which results in a boundary layer separation.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Engineering and Applied Science
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Unknown, Unknown
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1953
Record Number:CaltechETD:etd-04222003-111626
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-04222003-111626
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1447
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:22 Apr 2003
Last Modified:26 Dec 2012 02:38

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