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http://dx.doi.org/10.5139/JKSAS.2006.34.9.089

Thermal Phenomena of an N2O Catalyst Bed for Hybrid Rockets Using a Porous Medium Approach  

유우준 (한국항공대학교)
김수종 (한국항공대학교)
김진곤 (한국항공대학교)
장석필 (한국항공대학교)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.34, no.9, 2006 , pp. 89-96 More about this Journal
Abstract
In this study, fluid flow and thermal characteristics in a catalyst bed for nitrous oxide catalytic decomposition which is introduced as a hybrid rocket ignition system for small satellites were theoretically considered. To analyze the thermal phenomena of the catalyst bed, a so-called porous medium approach has been opted for modeling the honeycomb geometry of the catalyst bed. Using a Brinkman-extended Darcy model for fluid flow and the one-equation model for heat transfer, the analytical solutions for both velocity and temperature distributions in the catalyst bed are obtained and compared with experimental data to validate the porous medium approach. Based on the analytical solutions, parameters of engineering importance are identified to be the porosity of the catalyst bed, effective volumetric ratio, the ratio of the radius of the catalyst bed to the radius of a pore, heat flux generated by a heater, and pumping power. Their effects on thermal phenomena of the catalyst bed are studied.
Keywords
Hybrid Rocket; N2O; Catalyst; Porosity; Porous Media Approach;
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