The heating rate characteristics of a surface ablation apparatus were investigated. The apparatus utilized oxyacetylene combustion products for two-dimensional hot gas flow parallel to flat plate specimens. Maximum heating rates were 2.5 x 105 Btu/hr ft2. This was approximately 757. Higher than predicted, and was attributed to recombination energy release. The apparatus produces a gas stream with a velocity of approxi-mately 300 ft/sec for heating 3x5 inch flat plates. Stream temperatures around 55000 R were measured using the sodium spectral line reversal technique. Heating rates were calorimetrically obtained by measuring the transient temperature rise of a stainless steel flat plate. Rates ranged from 105 to 2.5 x 105 Btu/hr ft2 for plate temperatures of 800° R to 2000° R.nStudy of the results indicated that increased mass flow rates in the apparatus would produce better two-dimensional flat plate heating characteristics.
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