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  • 1
    facet.materialart.
    Unknown
    Longitudinal grooves for bluff body drag reduction (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Wind tunnel test results are presented for four axisymmetric bluff body configurations in order to determine their effect on form and pressure drag. It was found that drag reductions on the order of 40% are obtainable with an afterbody incorporating four longitudinal 'V' grooves. Although this effect may be due to the functioning of the grooves as longitudinal, continuous vortex generators, it is concluded that further research is needed to elucidate the physical basis of the test results. Optimization of the effect will be useful in base drag reduction for such vehicles as automobiles and cargo aircraft with sharply upswept afterbodies.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 19; Apr. 198
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Longitudinal afterbody grooves and shoulder radiusing for low-speed bluff body drag reduction (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new low-speed drag reduction approach is proposed which employs longitudinal surface V-shaped grooves cutting through the afterbody shoulder region. The test Reynolds number range was from 20,000 to 200,000 based on undisturbed free-stream flow and a body diameter of 6.08 cm. The V-grooves are shown to be most effective in reducing drag when the afterbody shoulder radius is zero. Reductions in drag of up to 33% have been measured for this condition. For large shoulder radius, the grooves are only effective at the lower Reynolds numbers of the test.
    Keywords: AERODYNAMICS
    Type: ASME PAPER 81-WA/FE-5 , Winter Annual Meeting; Nov 15, 1981 - Nov 20, 1981; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
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