Temperature and heat flux measurement on hot models in short-duration facilities

Kraetzig, Benjamin and Buttsworth, David R. and Zander, Fabian and Loehle, Stefan (2014) Temperature and heat flux measurement on hot models in short-duration facilities. Journal of Thermophysics and Heat Transfer, 29 (1). pp. 37-46. ISSN 0887-8722

Abstract

An electrical preheating technique applied to a carbon-based model in an impulse facility has previously demonstrated surface temperatures around 2500 K, but the measurement of heat flux at such elevated surface temperatures was not previously achieved. A technique for fast-response surface temperature measurement of an electrically preheated carbon-phenolic model using an indium gallium arsenide detector with in situ calibration via a visible/near-infrared spectrometer is assessed through application in a short-duration cold-flow hypersonic wind tunnel. The method is reliable: the scatter in temperatures determined from successive acquisitions of the spectrometer data had a standard deviation of 3 K at a mean temperature of about 1500 K; the standard deviation of the Indium gallium arsenide detector results from the visible/near-infrared spectrometer data was 11 K at a temperature of about 1100 K after the termination of the hypersonic flow. The surface temperature history from the Indium gallium arsenide detector was analyzed using a one-dimensional transient heat conduction model to deduce the surface heat flux. Good agreement with an engineering correlation for stagnation point heat flux is demonstrated; however, uncertainties are large (±33%), as the thermal properties of the particular carbon-phenolic material were not available. The method is suitable for application in impulse facilities, but the effusivity (√pck) for the heat shield material will need to be accurately defined for reliable deduction of surface heat flux.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 21 Aug 2016 23:44
Last Modified: 15 Feb 2017 05:29
Uncontrolled Keywords: atmospheric temperature; carbon; gallium; gallium arsenide; heat conduction; heat shielding; hypersonic flow; Indium; spectrometers; statistics; surface properties; temperature measurement; wind tunnels; electrical preheating; engineering correlations; heat flux measurement; hypersonic wind tunnels; Indium gallium arsenide; stagnation point heat fluxes; surface temperatures; transient heat conduction
Fields of Research : 09 Engineering > 0901 Aerospace Engineering > 090107 Hypersonic Propulsion and Hypersonic Aerodynamics
Socio-Economic Objective: B Economic Development > 88 Transport > 8803 Aerospace Transport > 880399 Aerospace Transport not elsewhere classified
Funding Details:
Identification Number or DOI: 10.2514/1.T4309
URI: http://eprints.usq.edu.au/id/eprint/26629

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