Numerical and experimental investigation of the means for reducing the aeroacoustic loads in an extended rectangular cavity at subsonic and transonic freestream velocities

The results of a comprehensive investigation including numerical calculations and experiments with models in a wind tunnel and a vehicle under flight conditions aiming to find the ways of reducing the pressure fluctuation levels in an extended cavity at subsonic and transonic freestream velocities a...

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Bibliographic Details
Published inFluid dynamics Vol. 52; no. 2; pp. 239 - 252
Main Authors Abdrashitov, R. G., Arkhireeva, E. Yu, Dan’kov, B. N., Korotaev, V. S., Kosenko, A. P., Popov, O. Yu, Strel’tsov, O. K., Chuchkalov, I. B.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.03.2017
Springer Nature B.V
Subjects
Classical and Continuum Physics
Classical Mechanics
Engineering Fluid Dynamics
Flight conditions
Fluid- and Aerodynamics
Holes
Mathematical models
Permeability
Physics
Physics and Astronomy
Stability
Subsonic aircraft
Variations
extended cavity
dissipation losses
aeroacoustic loads
mixing layer
wave disturbances
pressure fluctuations
permeable deflector
turbulent flows
instability wave
combined numerical methods
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Summary:The results of a comprehensive investigation including numerical calculations and experiments with models in a wind tunnel and a vehicle under flight conditions aiming to find the ways of reducing the pressure fluctuation levels in an extended cavity at subsonic and transonic freestream velocities are presented. It is shown that the reduction of these loads can be achieved using the means which have demonstrated their effectiveness for cavities with the open-type flows, for example, a permeable deflector and the bevelling of the rear wall but only in the case of a given combination of their geometric parameters. The mechanisms of the action of these devices on the flow, thanks to which the intensity of the wave disturbances generated by the rear wall is reduced, the instability wave growth in the mixing layer behind the deflector is limited, and the fluctuation level in the cavity decreases, are investigated. The results of numerical investigations of the flow in a cavity with a permeable deflector are apparently among the first.
ISSN:0015-4628
1573-8507
DOI:10.1134/S0015462817020089