Practical Viscous Drag Reduction: Charting a Course out of the Valley

Felder, Wilson N.; Dale, Gary A.; Cash, Carol

doi:10.2514/6.2019-1623

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2020

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“…Very promising are, for instance, contactless manufacturing technologies [27]. USAF recently launched a research program with the aim to retrofit with riblets its transport fleet [28]. This paper deals with the effect of the riblets on the performances of a real aircraft when combined with the NLF technology [29].…”

Section: Introductionmentioning

confidence: 99%

Performance Improvements of a Regional Aircraft by Riblets and Natural Laminar Flow

Catalano¹,

Rosa²,

Mele³

et al. 2020

Journal of Aircraft

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The application of riblets on a typical regional turboprop configuration is discussed in this paper. The effect of the riblets is modeled as a singular roughness problem by a proper boundary condition at the wall. The model, already proposed in a previous paper, is briefly described. The drag prediction capabilities are verified by showing some airfoil flow applications. Then a typical wing-body of a regional aircraft is considered. The configuration has been designed to have extended natural laminar flow in cruise conditions. Riblets are applied at flow specifications representative of cruise in combination with the natural laminar flow technology and in climb/descent conditions. A comparison of the two technologies in terms of drag reduction is presented. Their combined application can result in a cruise drag reduction of more than 20%. The resulting fuel savings during a typical operational day are evaluated.

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Section: Introductionmentioning

confidence: 99%