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Drag-reduction test of riblets using ARE’s high speed buoyancy propelled vehicle — MOBY-D

  • Kwing-So Choi (a1)

Abstract

Drag-reduction performance of riblets on an axi-symmetric body was investigated using ARE’s High Speed Buoyancy Propelled Vehicle (MOBY-D) at high Reynolds number. Approximately 35% of the wetted body surface was applied with riblets in situ using BMT’s RIBCOATTM process, and net drag reductions between 0 and 3.0% were observed during the flight. The drag reduction increased toward the ascent as the vehicle acceleration decreased, indicating that the favourable effects that riblets have on the boundary layer structure may be susceptible to acceleration.

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1 Wilkinson, S. P., Anders, J. B., Lazos, B. S. and Bushnell, D. M. Turbulent drag reduction research at NASA Langley - progress and plans. In: Turbulent drag reduction by passive means. The Royal Aeronautical Society, 15-17 Sept 1987, pp 132.
2 Savill, A. M., Truong, T. V. and Rhyming, I. L. Turbulent drag reduction by passive means: a review and report on the first European drag reduction meeting. J Theor Appl Mech, 1988, 7, pp 353378.
3 Choi, K.-S., Pearcey, H. H. and Savill, A. M. Test of drag reducing riblets on a one-third scale racing yacht. In: Turbulent drag reduction by passive means. The Royal Aeronautical Society, 15-17 Sept 1987, pp 377391.
4 McLean, J. D., George-Falvy, D. N., and Sullivan, P. P. Flight-test of turbulent skin-friction reduction by riblets. In: Turbulent drag reduction by passive means. The Royal Aero nautical Society, 15-17 Sept 1987, pp 408424.
5 Choi, K.-S. and Johnson, R. Pressure gradient effect on the turbulence structure over riblet surface. Proc 2nd European Turbulence Conference. Berlin, 30 Aug-2 Sept 1988.
6 Squire, L. C. and Savill, A. M. Some experiences of riblets at transonic speeds. In: Turbulent drag reduction by passive means. The Royal Aeronautical Society, 15-17 Sept 1987, pp 392407.
7 Gaudet, L. An assessment of the drag reduction properties of riblets and the penalties of off-design conditions. In: Turbulent drag reduction by passive means. The Royal Aeronautical Society, 15-17 Sept 1987, pp 363376.
8 Choi, K.-S. Near-wall structure of turbulent boundary layer with riblets. J Fluid Mech, 1989, pp 417458.
9 Sellin, R. H. J. and Moses, R. T. (Eds): Drag reduction in fluid flows: Techniques for friction control. Ellis Horwood, 1989.
10 Gillcrist, M. C. and Reidy, L. W. Drag Measurements on Marine Vehicles With a Riblet Surface Coating. AIAA Paper 89-2932, 1989.

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Drag-reduction test of riblets using ARE’s high speed buoyancy propelled vehicle — MOBY-D

  • Kwing-So Choi (a1)

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