STREAMWISE PORTHOLE FUEL INJECTION FOR BOUNDARY … some level of reduction to the skin friction drag. For reasons that will be discussed later, all three porthole cases exhibit some lesser ability to reduce the skin friction drag generated along the surface downstream of the step, with the closest porthole spacing providing performance nearest to that of the slot … Engineered Surfaces, Materials and Coatings for Aircraft Drag Reduction … 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 … Polymer/riblet combination for hydrodynamic skin friction reduction … Aug 29, 1995 · 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
A final stage is often referred to as "shave and taper": the swimmer shaves off all exposed hair for the sake of reducing drag and having a sleeker and more hydrodynamic feel in the water. [8] Additionally, the "shave and taper" method …
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. 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 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. Direct measurement and analysis of skin friction and ... Get this from a library! Direct measurement and analysis of skin friction and cooling downstream of multiple flush-slot injection into a turbulent Mach 6 boundary layer. [Floyd G Howard; Andrew J Srokowski; Langley Research Center.]
US7491178B2 - Method and apparatus for penetrating tissue…
Skin friction reduction by slot injection at mach 0.8 in ... Skin friction reduction by slot injection at mach 0.8 Responsibility Victor Zakkay and Chi R. Wang ; prepared by New York University, Westbury, N.Y., for Langley Research Center. Time-Resolved PIV Investigation on the Skin Friction ... The average skin friction reduction rates are calculated as 7.95% for the Z06 plane and 2.73% for the Z00 plane, respectively. Also it is revealed that the streamwise local skin friction distributions at two spanwise locations exhibit negative correlation. 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.
Additional Physical Format: Online version: Zakkay, Victor. Skin friction reduction by slot injection at mach 0.8. Washington : U.S. National Aeronautics and Space ...
Skin friction reduction by slot injection at Mach 0.8
More information on the New release, including additional New…
Skin Friction Reduction by Injection Through Combinations ... Home > ; Publications > ; AIAA Journal > ; Volume 13, Issue 8 > ; Skin Friction Reduction by Injection Through Combinations of Slots and Porous Sections Skin friction reduction by slot injection at mach 0.8 ... Additional Physical Format: Online version: Zakkay, Victor. Skin friction reduction by slot injection at mach 0.8. Washington : U.S. National Aeronautics and Space ... 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. Skin friction reduction by slot injection at mach 0.8 in ...
Review of research into the concept of the microblowing ... A new technology for reducing turbulent skin friction, called the Microblowing Technique (MBT), is presented. Results from proof-of-concept experiments show that this technology could potentially reduce turbulent skin friction by more than 50% of the skin friction of a solid flat plate for subsonic and supersonic flow conditions. 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