Abstract
The possibility of reducing turbulent friction with the help of large-eddy-breakup devices (LEBUs) and riblets is studied experimentally. The tests were conducted in a low-turbulence wind tunnel on a flat plate for 2·106 ≤ Re ≤ 7·106. The local friction coefficient was measured using internal strain-gauge balances, and the total drag was estimated by the momentum-transfer method. It is shown that a combination of LEBUs and riblets makes it possible to reduce the total turbulent friction drag of a flat plate 1800 mm long by 16%. The effects of the length of a ribbed surface on the efficiency of friction reduction and of LEBUs and riblets on the structure of a turbulent boundary layer are analyzed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M. J. Walsh and L. M. Weinstein, “Drag and heat transfer on surfaces with small longitudinal fins,” AIAA Pap. No. 1161, 11 (1978).
M. J. Walsh, “Turbulent boundary layer drag reduction using riblets,” AIAA Pap. No. 169, 8 (1982).
G. V. Enyutin, Yu. A. Lashkov, N. V. Samoilova, et al., “Experimental investigation of the effect of longitudinal fins on the friction drag of a plane plate,”Izv. AN SSSR, Mekh. Zhidk. Gaza, No. 2, 140 (1987).
G. V. Enyutin, Yu. A. Lashkov, N. V. Samoilova, et al., “Effect of flow wash on the aerodynamic efficiency of ribbed surfaces,”Izv. AN SSSR, Mekh. Zhidk. Gaza, No. 1, 37 (1991).
G. V. Enyutin, Yu. A. Lashkov, N. V. Samoilova, et al., “Experimental investigation of turbulent friction on intermittently ribbed surfaces,”Uch. Zap. TsAGI,22, No. 3, 43 (1991).
G. V. Enyutin, Yu. A. Lashkov, N. V. Samoilova, et al., “Effect of external turbulence and pressure gradient on the efficiency of turbulent friction reduction on a ribbed surface,”Uch. Zap. TsAGI,22, No. 4, 33 (1991).
E. Coustols, C. Gleyzes, V. Schmitt, and P. Berrue, “Etude experimentale de la reduction du frottement turbulent au moyen de parois rainurees,”24-eme Colloque d'Aerodynamique appliquee, Poitiers (1987).
M. J. Walsh, “Riblets,”Progr. in Astronaut. and Aeronaut.,123, 203 (1990).
N. Hefner, L. M. Weinstein, and D. M. Bushnell, “Reduction of turbulent friction drag by breaking up large vortices,” in:Viscous Drag Reduction [Russian translation], Mashinostroenie, Moscow (1984), p. 130.
D. M. Bushnell, Turbulent drag reduction for external flows,” AIAA Pap. No. 227, 20 (1983).
M. J. Walsh and A. M. Lindemann, “Optimization and application of riblets for turbulent drag reduction,” AIAA Pap. No. 347, 10 (1984).
A. M. Savill, E. Koury, W. Sebastian, and L. C. Squire, “Local drag balance measurements for the combination of Hoecht U-groove riblets with flat plate manipulators,”Pap. Turb. Drag Reduction Working Party, 3rd Conf. ONERA-Chatillon, Paris (1988).
A. M. Savill, “Effect of turbulent boundary layer structure on longitudinal riblets alone and in combination with outer layer devices,”Pap. 4th Intern. Sympos. on Flow Visualization, Paris (1986), p. 303.
I. V. Gudilin, G. V. Enyutin, A. Yu. Kim, et al., “Experimental study of the combined effect of longitudinal riblets and LEBUs on turbulent friction,”Uch. Zap. TsAGI,20, No. 6, 8 (1989).
H. Schlichting,Boundary Layer Theory, McGraw-Hill, New York (1968).
Boundary Layer Turbulent Flows. Part 2:Numerical and Experimental Analyses, ONTI TsAGI Review No. 575 (1980).
Author information
Authors and Affiliations
Additional information
Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 3, pp. 39–46, May–June, 1995.
Rights and permissions
About this article
Cite this article
Gudilin, I.V., Lashkov, Y.A. & Shumilkin, V.G. Combined effect of longitudinal riblets and LEBU-devices on turbulent friction on a plate. Fluid Dyn 30, 366–371 (1995). https://doi.org/10.1007/BF02282448
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02282448