NON-UNIFORM SLOT INJECTION (SUCTION) INTO WATER BOUNDARY ... be delayed by non-uniform slot suction and also by moving the slot downstream but the effect of non-uniform slot injection is just the opposite. The heat transfer rate is found to depend strongly on viscous dissipation but the skin friction is little affected by it. 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 ...
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 ...
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Non-uniform multiple slot injection (suction) or wall enthalpy …
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Influence of Surface Roughness on Polymer Drag Reduction - DTIC
Negative skin friction is usually a downward shear drag acting on a pile or pile group due to downward sinking of surrounding soil relative to the piles. This shear drag movements are expected to occur when a segment of the pile penetrates a compressible soil stratum that can consolidate. Engineered Surfaces, Materials and Coatings for Aircraft Drag ... The Seeker is primarily searching for existing technologies or research studies, outside of the aircraft industry, that provide surface friction reduction in fluid mediums and have potential to be translated to the aircraft industry for skin friction reduction. Other sources of aircraft drag reduction are sought as well.
Polymer/riblet combination for hydrodynamic skin friction ...
Submarines - Polymer Drag Reduction Decades of research have identified two very promising techniques for reducing friction drag: polymers and microbubbles, which have shown 70-80% reduction in skin-friction drag coefficient in the ... Skin friction reduction in supersonic flow by injection ... An experimental study of skin friction reduction in a Mach 3.0 air steam with gaseous injection through a tangential slot, a porous wall section, and combinations of the two was conducted. The primary data obtained were wall shear values measured directly with a floating element balance and also inferred from Preston Tube measurements. Freeman Scholar Review: Passive and Active Skin-Friction Drag ... A variety of skin-friction drag reduction (FDR) methods for turbulent boundary layer (TBL) flows are reviewed. Both passive and active methods of drag reduction are discussed, along with a review of the fundamental processes responsible for friction drag and FDR.
Fundamentals and Applications of Unsteady Suction / Blowing for ... Nov 29, 2016 ... Use multiple actuators. ○ Space them optimally ... Reduced sensitivity to unsteady winds ... near slot. • We note: • Suction is significantly more effective than blowing. • Especially ... Skin friction greatly increases, due to wall jet,. Aerodynamics of Flight - FAA