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Influence of downwash on the aerodynamic efficiency of fine-ribbed surfaces

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Abstract

A low-turbulence wind tunnel has been used to make an investigation by the weight method of the influence of downwash of the free stream relative to the direction of ribs on the reduction of the frictional drag of a ribbed surface. It was found that an increase of the downwash angle to 10–15° hardly reduced the efficiency of the ribbing. The effect of a relative bluntness Δ/s of the crests (s is the ribbing step) of the riblets on the frictional drag was considered, and an appreciable reduction of the efficiency of longitudinal ribbing was observed for Δ/s ≈ 0.05.

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Literature cited

  1. M. J. Walsh and A. M. Lindemann, “Optimization and application of riblets for turbulent drag reduction,” 22nd AIAA Aerospace Sciences-Meeting, Reno, Nevada, January 9–12 (1984).

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  3. G. V. Enyutin, Yu. A. Lashkov, N. V. Samoilova, et al., “Experimental investigation of the influence of longitudinal ribbing on the drag of a flat plate,” Izv. Akad. Nauk SSSR, Mekh. Zhidk. Gaza, No. 2, 140 (1987).

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Authors and Affiliations

  1. Moscow

    G. V. Enyutin, Yu. A. Lashkov, N. V. Samoilova, I. V. Fadeev & E. A. Shumilkina

  2. Khar'kov

    I. V. Fadeev & E. A. Shumilkina

Authors
  1. G. V. Enyutin
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  2. Yu. A. Lashkov
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  3. N. V. Samoilova
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  4. I. V. Fadeev
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  5. E. A. Shumilkina
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Additional information

Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 1, pp. 37–41, January–February, 1991.

We thank V. V. Mikhailov for his interest in the work and for valuable comments.

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Enyutin, G.V., Lashkov, Y.A., Samoilova, N.V. et al. Influence of downwash on the aerodynamic efficiency of fine-ribbed surfaces. Fluid Dyn 26, 31–35 (1991). https://doi.org/10.1007/BF01050109

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  • DOI: https://doi.org/10.1007/BF01050109

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