THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Đorđe S. Vuković

,

Dijana B. Damljanović

THERMAL EFFECTS INFLUENCING MEASUREMENTS IN A SUPERSONIC BLOWDOWN WIND TUNNEL

ABSTRACT
During a supersonic run of a blowdown wind tunnel, temperature of air in the test section drops which can affect planned measurements. Adverse thermal effects include variations of the Mach and Reynolds numbers, variation of airspeed, condensation of moisture on the model, change of characteristics of the instrumentation in the model, et cetera. Available data on thermal effects on instrumentation are pertaining primarily to long-run-duration wind tunnel facilities. In order to characterize such influences on instrumentation in the models, in short-run-duration blowdown wind tunnels, temperature measurements were made in the wing-panel-balance and main-balance spaces of two wind tunnel models tested in the T-38 wind tunnel. The measurements showed that model-interior temperature in a run increased at the beginning of the run, followed by a slower drop and, at the end of the run, by a large temperature drop. Panel-force balance was affected much more than the main balance. Ways of reducing the unwelcome thermal effects by instrumentation design and test planning are discussed.
KEYWORDS
blowdown wind tunnel, thermal matrix, supersonic testing, isentropic flow, thermo-compensation
PAPER SUBMITTED: 2016-04-04
PAPER REVISED: 2016-07-13
PAPER ACCEPTED: 2016-07-26
PUBLISHED ONLINE: 2016-08-07
DOI REFERENCE: https://doi.org/10.2298/TSCI160404175V
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Issue 6, PAGES [2101 - 2112]
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Thermal effects influencing measurements in a supersonic blowdown wind tunnel

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence