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Application of a 20kW Arc-Heated Wind Tunnel to Evaluation Tests of Wall Catalysis
- Source :
- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES. 45:217-223
- Publication Year :
- 2003
- Publisher :
- Japan Society for Aeronautical and Space Sciences, 2003.
-
Abstract
- This paper describes the performance characteristics of a 20 kW-class arc-heated wind tunnel and the investigation of material catalysis as an application of this facility. First of all, stagnation heat fluxes and pressures are measured in high-enthalpy air and nitrogen arc jets that are generated by a constrictor-type arc heater. Total enthalpies of the arc jets are estimated based on Pope’s theory. The total enthalpies are 7.5–22 MJ/kg for nitrogen and 13–19 MJ/kg for air. The operation envelope of this arc-heated wind tunnel and the applicable conditions for reentry simulation or the thermal protection tests are discussed based on the experimental results. Finally, as an application of this arc-heated wind tunnel, evaluation tests of wall catalysis have been attempted by the use of two flat-faced cylindrical models equipped with two kinds of specimens of catalytic material. The evaluation tests are composed of heat flux measurements and spectroscopic measurements. It is found that there is a certain difference in obtained heat fluxes between the two catalytic materials. Emission spectra from a shock layer formed in front of the model are measured, and wall catalysis is discussed based on the spectra measurements. The results show the existence of catalytic wall effects.
Details
- ISSN :
- 05493811
- Volume :
- 45
- Database :
- OpenAIRE
- Journal :
- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
- Accession number :
- edsair.doi...........6fdd4f367012b24dc53b9eb5d4d7da9e