HEAT TRANSFER MEASUREMENTS WITH A CATALYTIC FLAT PLATE IN A NONEQUILIBRIUM EXPANSION OF OXYGEN
Interim rept. Jul 1977-Jun 1967
CORNELL AERONAUTICAL LAB INC BUFFALO NY
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Heat transfer data are presented which were obtained with a sharp flat plate having surfaces both catalytic and noncatalytic to oxygen atom recombination. The plate was inclined at a compressive angle to the flow to provide a constant-pressure flow field in which the measurements could be readily interpreted. The experiments were made in a shock tunnel using oxygen- argon mixtures as the test gas. Test conditions were chosen such that the flow was in thermochemical nonequilibrium. The intent of the experiment was to illustrate the application of this probe configuration as a diagnostic tool in a high temperature test facility. The shock tunnel conditions necessary to produce a meaningful experiment are reviewed. In addition, the procedures for conditioning the catalytic surface and reducing data are discussed. Typical data traces are presented to show that the catalytic probe can be used to determine the end of the period of useful test flow. The data obtained with the catalytic and noncatalytic surfaces compare favorably with boundary-layer theory which accounts for Prandtl number effects and variations of the density viscosity-product in the boundary layer. The ratio of catalytic-to- noncatalytic heat transfer rate is interpreted with the theory to infer the ambient stream atom mass fractions. The inferred mass fractions are in fair agreement with values computed for relevant oxygen dissociation-recombination rates.
- Physical Chemistry
- Test Facilities, Equipment and Methods
- Fluid Mechanics