Results 271 to 280 of about 37,322 (309)
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AIAA Journal, 1981
It is shown that the mechanisms of forebody drag reduction by means of either a spike or a forward-facing jet are similar, with the maximum achievable drag reduction being of the same order. Because the jet may be a relatively cool gas, however, the forward facing jet has the additional capability of reducing the aerodynamic heating that is so severe ...
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It is shown that the mechanisms of forebody drag reduction by means of either a spike or a forward-facing jet are similar, with the maximum achievable drag reduction being of the same order. Because the jet may be a relatively cool gas, however, the forward facing jet has the additional capability of reducing the aerodynamic heating that is so severe ...
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Progress in Aerospace Sciences, 1975
Abstract The present paper gives a review of various existing methods for reducing base drag of two-dimensional and axisymmetric bodies having a blunt base. These methods include splitter plates, both thin and thick, splitter wedges, base bleed. boat-tailing and various types of serrated trailing edges.
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Abstract The present paper gives a review of various existing methods for reducing base drag of two-dimensional and axisymmetric bodies having a blunt base. These methods include splitter plates, both thin and thick, splitter wedges, base bleed. boat-tailing and various types of serrated trailing edges.
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The Importance of Drag Reduction
Aircraft Engineering and Aerospace Technology, 1936THE contents of a technical journal such as AIRCRAFT ENGINEERING are of necessity indicative of current thought. Its pages at any given time reflect the problems that are confronting designers and the doubts that may be perplexing them. At the same time, they give a picture of the manner in which progress is being made and the order in which various ...
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The Canadian Journal of Chemical Engineering, 1980
AbstractDrag reduction in turbulent pipe flow by means of boundary and centerline injection of long hair‐like asbestos fibers has been investigated. Pressure drop and mean velocity profiles were measured at various Reynolds numbers and injection rates in order to study some mechanistic aspects of drag reduction in water‐fiber and polymer‐fiber systems.
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AbstractDrag reduction in turbulent pipe flow by means of boundary and centerline injection of long hair‐like asbestos fibers has been investigated. Pressure drop and mean velocity profiles were measured at various Reynolds numbers and injection rates in order to study some mechanistic aspects of drag reduction in water‐fiber and polymer‐fiber systems.
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1981
Abstract : A study is being made of the effect on aerodynamic drag of boundary layer irradiation by radioactive sources. A blow-down wind tunnel and a skin friction drag balance have been designed and constructed. The balance is of the null-position type, and is operated using an automatic control system to maintain the null position of the drag plate.
J. Clark +3 more
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Abstract : A study is being made of the effect on aerodynamic drag of boundary layer irradiation by radioactive sources. A blow-down wind tunnel and a skin friction drag balance have been designed and constructed. The balance is of the null-position type, and is operated using an automatic control system to maintain the null position of the drag plate.
J. Clark +3 more
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On the mechanism of drag reduction
Journal of Non-Newtonian Fluid Mechanics, 1995Recent studies indicate that growing streamwise perturbations driven by streamwise vortices and the resulting Reynolds stresses play a significant role in both the transition to turbulence and the near-wall turbulent flow. In this note, we show that viscoelasticity introduces a negative feedback, so that the streamwise flow driven by a streamwise ...
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Annual Review of Fluid Mechanics, 1969
An examination is made of the experimental evidence for the reduction of skin friction in dilute solutions of high molecular weight linear polymers below that of the solvent alone. Inferences are drawn about the necessary properties of the polymers and their solvents, and the mechanical properties of the solutions are described.
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An examination is made of the experimental evidence for the reduction of skin friction in dilute solutions of high molecular weight linear polymers below that of the solvent alone. Inferences are drawn about the necessary properties of the polymers and their solvents, and the mechanical properties of the solutions are described.
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Reduction of the Induced Drag of a Supersonic Wing
Fluid Dynamics, 2000zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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A Stress-Controlled Drag-Reduction Phenomenon
Symposium on Mechanics of Rheologically Complex Fluids, 1966Abstract An unusual stress controlled turbulent flow phenomenon observed in aqueous solutions of some derivatives of an unsaturated 18 carbon atom fatty acid is described.
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Research Progress on the Collaborative Drag Reduction Effect of Polymers and Surfactants
Materials, 2020Gu Yunqing, Jiegang Mou, Denghao Wu
exaly