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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v41.i3.50
pages 260-281

Rigid Bodies without Boundary-Layer Separation

Igor G. Nesteruk
Institute of Hydromechanics of National Academy of Sciences of Ukraine 8/4, Zhelyabov St., 03680, Kyiv-180, MSP, Ukraine

RESUMO

Shapes with a special pressure distribution can prevent boundary-layer separation and as a result can allow both reduction of drag and noise without any active flow-control methods. Examples of such axisymmetric and 2D shapes with favourable pressure gradients both up- and downstream of the maximum thickness point have been calculated with the use of a linearized approach as well as by exact solutions of the Euler equations for steady flows of an ideal fluid. The zone of positive pressure gradient can be diminished to just 0.3 % of the total body length. It is shown that similar shapes with negative pressure gradients can be obtained for sub- and supersonic flows of compressible fluid. Wind-tunnel tests with axisymmetric bodies have shown that separation can be avoided on some of these shapes.


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