Numerical Investigation of Flow Control by Suction and ... The case studied is the flow field over a subsonic airfoil with four suction and injection slots on the suction side of the airfoil. Five different angles of attack, 0, 5, 10, 13.3 and 20 with the Mach ... drag reduction, lift enhancement and flow-induced noise suppression. By controlling the flow, the fuel ... skin-friction drag for a laminar ... Center for Turbulence Research Annual Research Briefs 2010 ... Skin-friction drag reduction has significant practical value for marine vehicles. It is known that skin-friction drag accounts for more than 60% of the total drag of a cargo ship. For several decades, various methods have been explored to reduce the skin-friction drag. Polymer/riblet combination for hydrodynamic skin friction ... injecting a drag reducing polymer into the individual groove valleys at multiple points along each groove such that amounts of the polymer needed to reduce skin friction along the entire length of the surface are minimized, infecting the drag reducing polymer by means of an array of slots or holes angled such that the injected polymer is ...
In a recent experimental study, Gogte et al. 25 observed drag reduction in turbulent flow over a hydrofoil coated with a randomly structured superhydrophobic surface produced from hydrophobically-modified sandpaper. Drag reductions of up to 18%, based on combined skin friction and form drag, were reported for the hydrofoil.
Polymer/riblet combination for hydrodynamic skin friction ... injecting a drag reducing polymer into the individual groove valleys at multiple points along each groove such that amounts of the polymer needed to reduce skin friction along the entire length of the surface are minimized, infecting the drag reducing polymer by means of an array of slots or holes angled such that the injected polymer is ... Skin Friction Measurements using Oil Film Interferometry ... Skin Friction Measurements using Oil Film Interferometry and Laser Doppler Anemometry ... such as viscous drag reduction. Oil film interferometry (OFI) and laser Doppler anemometry (LDA) measurements have been carried out at several locations downstream of the wall jet exit. Velocity profiles from the LDA measurements have been analyzed using a Microbubble Drag Reduction in Liquid Turbulent Boundary ... Microbubble Drag Reduction in Liquid Turbulent Boundary Layers. Charles L. Merkle and ... the magnitude of the skin friction reduction increases as the volume of bubbles in the boundary layer is increased until a maximum skin friction reduction of typically 80–90% of the undisturbed skin friction level is reached. ... Microbubble Drag ... Friction loss - Wikipedia
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SKIN-FRICTION DRAG REDUCTION WITHIN TURBULENT FLOWS - Deep Blue “Bubble-induced skin-friction drag reduction and the abrupt transition to air-layer drag reduction” in the Journal of Fluid Mechanics with co-authors Eric S. Winkel, Keary A. Lay, Steven L. Ceccio, David R. Dowling & Marc Perlin. Portions of Parts IV and V have been presented in the 2008 conference paper “Polymer degradation within a high- The behavior of the skin-friction coefficient of a turbulent ... It has been suggested that transverse square grooves, optimally sized and located, could result in a reduction in skin-friction drag. Choi and Fujisawa [3] studied the effect of a transverse square with w / δ 0 = 0.4 and reported a skin-friction drag reduction of about 1% while ignoring the pressure drag on the groove walls. Geotechnical Manual: Interpretation of Soil Data
Abstract Experiments were conducted to determine the reduction in surface skin friction and the effectiveness of surface cooling downstream of one to four successive flush slots injecting cold air at an angle of 10 deg into a turbulent Mach 6 boundary layer.
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Influence of a permanent liner on the skin friction of large-diameter bored piles in Hong Kong granitic saprolites S.-C.R. Lo and K.S. Li Abstract: The skin friction of large-diameter bored piles in Hong Kong granitic saprolite manifested high variability. Leading-edge slot - Wikipedia
Multiple slot skin friction reduction - CORE Abstract. The paper investigates analytically the effect of multiple slot injection on skin friction for a representative fuselage shape (ogive-cylinder body) and evaluates the potential of slot injection as a drag reduction system in subsonic flow. of Multiple Flush-Slot Injection Into - NASA of Multiple Flush-Slot Injection Into ... but the incremental improvement in skin-friction reduction decreased as the number of slots was increased. Cooling effectiveness was found to improve, for a given total mass injection, as the ... The multiple slot effect on skin friction is also examined. Pre ... SKIN FRICTION REDUCTION IN SUPERSONIC FLOW BY INJECTION ...