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TsAGI Science Journal

ISSN 印刷: 1948-2590
ISSN オンライン: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2015014266
pages 143-160

PARAMETRIC EXPERIMENTAL INVESTIGATIONS ON THE CROSS CORRELATION OF THE PRESSURE FLUCTUATIONS GENERATED BY A CASCADE OF "FORWARD-FACING STEP/BACKWARD-FACING STEP" COMBINATIONS

Aleksey Yuryevich Golubev
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky, Moscow Region, 140180, Russia
Boris Maksimovich Efimtsov
Central Aerohydrodynamic Institute (TsAGI) 1, Zhukovsky str., Zhukovsky, 140180 Moscow region

要約

The results of laboratory parametric experimental investigations of the pressure fluctuation fields generated by the flow over a cascade of "forward-facing step/backward-facing step" combinations are presented. This cascade of steps models the pressure fluctuation fields generated by the flow over aircraft fuselage windows. The module IφI of the normalized cross spectrum of the pressure fluctuations for the points in the cascade of forward-facing step/backward-facing step combinations significantly exceeds the normalized cross-spectrum module at the same observation points in the case of an undisturbed boundary layer. Of all the configurations considered, both at the beginning and end of the cascade, the maximum cross correlation is revealed in the pressure fluctuation fields generated by configuration 4 (i.e., the backward-facing step/backward-facing step). The normalized cross spectra of the pressure fluctuations generated by the configurations in the cascade increase when moving from the beginning to the end of the cascade. The dimensionless step height in the cascade does not considerably affect the cross-spectrum module IφI, or its argument arg φ and dimensionless phase velocity Uph = U. The absence of intermediate combinations of the forward-facing step/backward-facing step in the cascade has no significant effect on the cross correlation of the pressure fluctuation fields generated by the combinations situated downstream in the flow.


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