Abstract
A method of measuring unsteady aerodynamic heating including surface combustion at the stagnation region is presented. Experiments were conducted in an arc-heated high enthalpy wind tunnel using slender rod models made of fine grain graphite for spectroscopic use. The temperature rises at two stations in the graphite rod measured by thermocouples were used as the boundary conditions for one-dimensional heat conduction equation with physical properties dependent on temperature to be solved by finite difference analysis. The heat. transfer rates related to the surface temperature were obtained continuously for the case of unsteady aerodynamic heating caused by changes of stagnation enthalpy, surface tempera- ture and combustion rate. The experimental results were in good agreement with the analysis except for surface combustion. The results for surface combustion were in fairly good agreement with SCALA'S theory only in the diffusion controlled combustion, and the agreement was only qualitative in the rate controlled combustion.
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More From: The Journal of the Japan Society of Aeronautical Engineering
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