Global effect of local skin friction drag reduction in spatially developing turbulent boundary layer - Volume 805 - A. Stroh, Y. Hasegawa, P. Schlatter, B. Frohnapfel Park, J. & Choi, H. 1999 Effects of uniform blowing or suction from a spanwise slot on a turbulent boundary layer flow. Film-Cooling Effectiveness and Skin Friction in Hypersonic … May 01, 2019 · (2013) Hypersonic Turbulent Boundary-Layer Fuel Injection and Combustion: Skin-Friction Reduction Mechanisms. AIAA Journal 51:9, 2147-2157. Direct measurements at Mach 6 of turbulent skin-friction reduction by injection from single and multiple flush slots. 14th Aerospace Sciences Meeting. Citation ... Direct measurements and analysis of skin friction and cooling downstream … 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.
The surface skin-friction reduction downstream of one to four successive flush slots injecting at an angle of 10 deg into a turbulent Mach 6 boundary layer has been determined from direct measurements of surface shear. Increasing the number of succeeding slots increases the skin-friction reduction, but this trend reverses at high injection rates.
Nov 7, 2011 ... ... which have shown 70-80% reduction in skin-friction drag coefficient in the ... Ionic and non-ionic surfactants can also offer similar drag reduction as .... amount or more additive being ejected from multiple slots along the ... Aircraft drag reduction—a review - D M Bushnell, 2003 - SAGE Journals Cousteix, J., Arnal, D., Coustols, E. Reduction of aerodynamic skin friction drag. ..... Bandyopadhyay, P. R. Turbulent boundary layers subjected to multiple curvatures ... through flush transverse slots on turbulent boundary layer skin friction. Aircraft drag reduction—a review - SAGE Journals 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 ...
Global effect of local skin friction drag reduction in spatially developing turbulent boundary layer - Volume 805 - A. Stroh, Y. Hasegawa, P. Schlatter, B. Frohnapfel
Each array of perforations in the outer vehicle skin is served by a plenum chamber, which is selectively isolable from a suction manifold. US6454772B1 - Set screw for medical implant with gripping side… The set screw having a bore with at least one side slot extending parallel to the axis of the screw and intersecting with an underside of the screw to produce an edge at such intersection. .:: Foreign Associates
STREAMWISE PORTHOLE FUEL INJECTION FOR BOUNDARY-LAYER ...
Combustion occurred at all flow conditions with results indicating a maximum reduction in skin friction coefficient, of approximately 77 % of the level measured with no injection. Skin friction reductions of approximately 60 % were obtained at two other test flows.
Review of research into the concept of the microblowing ...
Influence of Surface Roughness on Polymer Drag Reduction - DTIC Feb 15, 2019 ... of the boundary layer resulting in a reduction in skin-friction drag. Substances used for .... This was a slot injector inclined at a shallow 5.70 from the model surface and contracting ... Multiple calibrations were performed on the ... Hypervelocity Skin-Friction Reduction by Boundary-Layer Combustion ... (2018) Analysis and reduction of skin-friction in a rocket-based combined-cycle engine flow path operating from ... Slot Injection of Hydrogen into a Supersonic Air Flow. ... Hypersonic Viscous Drag Reduction Via Multi-Porthole Injector Arrays . Submarines - Polymer Drag Reduction - GlobalSecurity.org
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 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 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. Global effect of local skin friction drag reduction in ...