Drag reduction by riblets

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences - Tập 369 Số 1940 - Trang 1412-1427 - 2011
Ricardo García-Mayoral1, Javier Jiménez1
1School of Aeronautics, Universidad Politécnica de Madrid, 28040 Madrid, Spain

Tóm tắt

The interaction of the overlying turbulent flow with riblets, and its impact on their drag reduction properties are analysed. In the so-called viscous regime of vanishing riblet spacing, the drag reduction is proportional to the riblet size, but for larger riblets the proportionality breaks down, and the drag reduction eventually becomes an increase. It is found that the groove cross section A + g is a better characterization of this breakdown than the riblet spacing, with an optimum . It is also found that the breakdown is not associated with the lodging of quasi-streamwise vortices inside the riblet grooves, or with the inapplicability of the Stokes hypothesis to the flow along the grooves, but with the appearance of quasi-two-dimensional spanwise vortices below y + ≈30, with typical streamwise wavelengths . They are connected with a Kelvin–Helmholtz-like instability of the mean velocity profile, also found in flows over plant canopies and other surfaces with transpiration. A simplified stability model for the ribbed surface approximately accounts for the scaling of the viscous breakdown with  A + g .

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Tài liệu tham khảo

Walsh M. J.& Lindemann A. M.. 1984 Optimization and application of riblets for turbulent drag reduction. AIAA paper 84-0347.

10.2514/5.9781600865978.0203.0261

10.1016/S0169-5983(99)00030-1

10.1243/095441003763031789

10.1146/annurev.fluid.36.050802.122103

10.1017/S0022112096004673

Bruse M., 1993, Near-wall turbulent flows, 719

Bechert D. W. Bruse M. Hage W.& Meyer R.. 1997 Biological surfaces and their technological application—laboratory and flight experiments on drag reduction and separation control. AIAA paper 97-1960.

10.1063/1.2204849

Coustols E., 1992, Skin friction drag reduction, 8.1

10.2514/3.13170

10.1016/j.jfluidstructs.2005.03.003

10.1016/S0376-0421(02)00048-9

Szodruch J.. 1991 Viscous drag reduction on transport aircraft. AIAA paper 91-0685.

Robert J. F., 1992, Skin friction drag reduction, 2.1

Roskam J., 1987, Airplane design. Part VI: preliminary calculation of aerodynamic, thrust and power characteristics

10.2514/3.11035

10.2514/3.11947

10.1007/s003480000150

10.2514/3.12174

10.1017/S0022112093002575

10.1017/S0022112093001363

10.1017/S0022112095004125

10.1017/S0022112098008921

10.1016/j.ijengsci.2007.03.002

García-Mayoral R.& Jiménez J.. Submitted Hydrodynamic stability and the breakdown of the viscous regime over riblets.

10.7551/mitpress/3014.001.0001

Luchini P., 1995, Asymptotic analysis of laminar boundary-layer flow over finely grooved surfaces, Eur. J. Mech. B/Fluids, 14, 169

10.1017/S0022112089002247

10.1017/S0022112091002641

10.1063/1.868303

10.1016/S0065-2156(08)70370-3

10.1063/1.868327

10.1007/s00348-002-0446-3

García-Mayoral R.& Jiménez J.. 2007 On the effect of riblet geometry on drag reduction. Technical report ETSIA/MF-072 School of Aeronautics Universidad Politécnica de Madrid.

Hage W., 2000, Proc. CEAS/DragNet European Drag Reduction Conf., 278

10.2514/3.25323

10.1063/1.858381

10.1017/S0022112099005066

10.1007/BF00120941

10.1146/annurev.fluid.32.1.519

10.1017/S0022112001004888

10.1017/S0022112006000887

10.1017/S0022112006002667

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Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

Tập 369 Số 1940

1412-1427

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