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TsAGI Science Journal

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

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2018026783
pages 1-12

AIR HUMIDITY EFFECT ON FLOW PARAMETERS IN SUBSONIC AND TRANSONIC WIND TUNNELS

Anton Roaldovich Gorbushin
Central Aerohydrodynamic Institute (TsAGI) 1, Zhukovsky str., Zhukovsky, 140180, Moscow region, Russia

RESUMO

Corrections for the effect of the specific humidity on the Mach number, flow velocity, Reynolds number, and dynamic pressure in subsonic and transonic wind tunnels in the absence of vapor condensation are derived. The correction significance is estimated based on the accuracy of total and static pressure measurements and on the drag coefficient error requirements. The humidity corrections to the dynamic pressure and to the Mach and Reynolds numbers are found to be negligible. The correction to the flow velocity turns out to be significant, reaching the maximum value of 0.4% at the natural level of humidity.


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