Global effect of local skin friction drag reduction in ... Global effect of local skin friction drag reduction in spatially developing turbulent boundary layer - Volume 805 - A. Stroh, Y. Hasegawa, P. Schlatter, B. Frohnapfel Skin Friction Reduction by Injection Through Combinations of ... Home > ; Publications > ; AIAA Journal > ; Volume 13, Issue 8 > ; Skin Friction Reduction by Injection Through Combinations of Slots and Porous Sections
Determination of Flow Characteristics of Multiple Slot Jet ...
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Non-uniform multiple slot injection (suction) or wall enthalpy into a compressible flow over a yawed circular cylinder ... and skin friction reduction on highspeed aircraft.References[8–12]presentdifferentstud-ies on the effect of slot injection/suction into a laminar com- Direct measurements and analysis of skin friction and ... 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.
Determination of Flow Characteristics of Multiple Slot Jet ...
How to Reduce Friction between Surfaces Reducing Friction. There are several ways to reduce friction: The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example. Replace sliding friction with rolling element friction, such as with the use of rolling element bearings. a general review of concepts for reducing skin friction ... - NTRS - Nasa reducing aerodynamic skin friction, with ah emphasis toward reviewing those with ... ing efforts are underway to determine the effect of swept and multiple slots. Aircraft Drag Prediction and Reduction - DTIC Oct 2, 2018 ... possibility of skin friction reduction through modification of the structure of the turbulence in the boundary layer ...... the use of multiple slots, the. Influence of Surface Roughness on Polymer Drag Reduction - DTIC
AERODYNAMIC DRAG REDUCTION OF A TRACTOR ... - Sacramento
turbulent skin friction reduction associated with mass injection was also known, ..... skin friction reduction via slot injection of LFC suction mass flow, operation of .... disturbance fields and multiple (usually 3-D) wave systems. Research has ... Non-similar solutions for unsteady flow over a yawed cylinder with non ... When the yaw angle increases, both the skin friction coefficient in the ... Studying complex flow phenomena around a yawed cylindrical cable and reducing drag force and .... In the recent times the role of non-uniform mass transfer through double slot ...... A. Thakur, X. Liu, J.S. MarshallWake flow of single and multiple yawed ... Drag reduction: enticing turbulence, and then an industry ... For a two-dimensional transonic aerofoil with skin-friction reduction in the first ..... boundary-layer thickness, including in the direction parallel to the slot and span. ... We emphasize the multi-disciplinary nature or designing and manufacturing ... Bird flight - Wikipedia Bird flight is the primary mode of locomotion used by most bird species in which birds take off ... Aerodynamic drag is the force opposite to the direction of motion, and hence the source of energy loss in flight. The drag .... The slots at the end of the wings, between the primaries, reduce the induced drag and wingtip vortices by ...
My question is about laminar flow across a smooth surface. I have read about how the eddy currents, caused by dimples, at the surface help a blunt object travel through the air with less drag as in a spinning golf ball. I have also read about skin friction drag that happens across a smooth surface such as a fixed airplane wing. Skin Friction Measurements using Oil Film Interferometry and ... Skin Friction Measurements using Oil Film Interferometry and Laser Doppler Anemometry T. Gunnar Johansson,* Faraz Mehdi, † Farzad Shiri,‡ Chalmers University of Technology, SE-41296 Göteborg, Sweden and Jonathan W. Naughton§ University of Wyoming, Laramie, WY, 82071 Submarines - Polymer Drag Reduction