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TsAGI Science Journal

ISSN Imprimir: 1948-2590
ISSN On-line: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2016016389
pages 769-782

EFFECTS OF TRANSITION PROCESSES ON SYSTEMATIC ERRORS OF HEAT MEASURING IN WIND TUNNELS

Evgeniy Pavlovich Stolyarov
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky, 140180, Moscow Region, Russia

RESUMO

A procedure to estimate the heat flux density is presented based on results of temperature measurements using an elementary thin-film sensor. It is shown that the heat flux density cannot be measured but can be determined by means of convolution of the corresponding impulse transfer function with the time derivative from the temperature measured inside the sensor. Well-behaved analytic expressions of the impulse transfer functions are obtained using the inverse Laplace transformation of the inverse heat transfer problem, and a numerical solution method for short time periods is presented, with a provision for transition processes. Systematic errors are estimated, which depend on the main similarity parameters and the number of experiments.


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