Prospects for the Application of Practical Drag Reduction Technologies to Legacy Transport Aircraft

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

doi:10.2514/6.2017-0044

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…On the other hand, a passive flow-control method does not require external energy. In particular, a passive flow-control device using an engineered surface, materials, or coatings does not require a modification to the outer bodies of existing objects that provide a broad application for a drag reduction [3]. Various types of passive flow-control methods have been developed by means of surface modifications, such as a trip rod [4][5][6][7], dimple [8,9], vortex generator [10,11], permeable surface [12][13][14], and riblets [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Microfiber Coating for Drag Reduction by Flocking Technology

Hasegawa

Sakaue

2018

Coatings

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The biomimicry of using a hair-like structure is introduced as a drag reduction coating. The hair-like structure consists of an array of microfiber that is introduced as a passive drag reduction device. An effective flow control for a transition delay or a flow attachment is expected via an interaction or counteraction of flexible fibers, compared to the existing passive methods that use a solid or rigid surface device. The effect of the microfiber coating on drag reduction over a bluff-body was experimentally investigated using a circular cylinder in a wind tunnel at Reynolds number of 6.1 × 104. A drag reduction of 32% was obtained when the microfiber coating with a length of 0.012D was located at 40° from the stagnation point. Smoke flow visualization showed that flow separation delay was induced by the microfiber coating when the drag reduction occurred.

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Section: Introductionmentioning

confidence: 99%

Microfiber Coating for Drag Reduction by Flocking Technology

Hasegawa

Sakaue

2018

Coatings

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“…According to the energy consumption and emission figures, it is evident that a reduction of the aerodynamic vorticity would allow a major reduction of drag (up to 20%), which would bring large benefits to many engineering applications [3,5] in aeronautics, ground and marine vehicles and pipelines.…”

Section: Introductionmentioning

confidence: 99%

Analysis of triangular sharkskin profiles according to second law

Liversage¹,

Trancossi²

2018

MMC_B

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This paper presents the analysis of a case of sharkskin effect, caused by a turbulent flow over rough engineered surfaces. From a large bibliographic analysis, the paper describes the preliminary CFD simulations of a series of profiles such as sawtooth profile (12x6 mm), scalloped (R=6mm) and triangular (6x2 mm). Although a best solution has not been identified, different geometries and dimensions have been analysed and the initial results have shown the potential of a triangular profile with a 90° angle on top implemented on Coanda affected surfaces. The reference test profile adopted is an elevated surface with an inclined step placed upwind. The corrugated surface has been applied to analyse the coupled effect of sharkskin on both the viscous and pressure terms of drag. The results allow the assessment of a mathematical model of the sharkskin behaviour, assuming a continuous profile of the riblets. Results have also been assessed against a flat planar surface with the same measurements. The outcome has demonstrated a potential reduction up to 30% in the wall shear stress. The analysis has led to the formulation of a new equation to calculate the drag and lift force as a function of Bejan number. This model opens the possibility of applying a second law of analysis method to aerodynamic and fluid dynamic effects. Although this model has not been sufficiently demonstrated, it can allow a theoretical calculation of entropy generation in the case of the specific fluid dynamic phenomenon.

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Progress Toward the Application of Practical Drag Reduction Technologies to Legacy Transport Aircraft

Felder

2018

2018 AIAA Aerospace Sciences Meeting

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Prospects for the Application of Practical Drag Reduction Technologies to Legacy Transport Aircraft

Cited by 9 publications

References 25 publications

Microfiber Coating for Drag Reduction by Flocking Technology

Microfiber Coating for Drag Reduction by Flocking Technology

Analysis of triangular sharkskin profiles according to second law

Progress Toward the Application of Practical Drag Reduction Technologies to Legacy Transport Aircraft

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