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.] 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. Engineered Surfaces, Materials and Coatings for Aircraft ... 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. A Motorized Sliding Sled Apparatus for Measuring the ... an actual reduction in the coefficient of friction. However, it is clear that compared to barrier film B there is a significant reduction in skin friction. Methods Objective Results Conclusions A Motorized Sliding Sled Apparatus for Measuring the Coefficient of Friction of Human Skin in vivo Gary Grove, cyberDERM Clinical Studies, Broomall, PA
Skin Friction Drag - an overview | ScienceDirect Topics
Determine allowable skin friction by applying a factor of safety of at least 2.0 to the ultimate shear strength. For drilled shaft design, reduce the allowable skin friction value by an additional reduction factor of 0.7 to account for soil disturbance. Drag Reduction Using Compliant Walls | SpringerLink Abstract. Compliant coating research is one of those areas which experienced its fair share of triumphs and debacles. For over forty years, the subject has fascinated, frustrated and occasionally gratified scientists and engineers searching for methods to delay laminar-to-turbulence transition, to reduce skin-friction drag in turbulent wall-bounded flows, to quell vibrations, and to suppress ... Friction loss - Wikipedia In fluid flow, friction loss (or skin friction) is the loss of pressure or “head” that occurs in pipe or duct flow due to the effect of the fluid's viscosity near the surface of the pipe or duct. In mechanical systems such as internal combustion engines , the term refers to the power lost in overcoming the friction between two moving ... Shaping of Axisymmetric Bodies for Minimum Drag in ... control; e.g., polymer injection1 or slot suction, 3) effi-cient propulsion; e.g., a wake propeller or a suction slot with a stern jet,2 and 4) efficient steering control consis-tent with hydrodynamic stability. Items 1 and 2 attempt to reduce skin friction and pres-sure drag while item 3 attempts to extract energy lost to
The team created artificial shark skin with a 16 x 24 array of synthetic scales, each 2 centimetres in length and angled at 90° to the surface of the "skin".
Bird flight - Wikipedia
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
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 Determine allowable skin friction by applying a factor of safety of at least 2.0 to the ultimate shear strength. For drilled shaft design, reduce the allowable skin friction value by an additional reduction factor of 0.7 to account for soil disturbance. Drag Reduction Using Compliant Walls | SpringerLink Abstract. Compliant coating research is one of those areas which experienced its fair share of triumphs and debacles. For over forty years, the subject has fascinated, frustrated and occasionally gratified scientists and engineers searching for methods to delay laminar-to-turbulence transition, to reduce skin-friction drag in turbulent wall-bounded flows, to quell vibrations, and to suppress ...
A leading-edge slot is a fixed aerodynamic feature of the wing of some aircraft to reduce the stall speed and promote good low-speed handling qualities. A leading-edge slot is a spanwise gap in each wing, allowing air to flow from below the wing to its upper surface. In this manner they allow flight at higher angles of attack and thus reduce the stall speed.
perforations reduced the friction factor. Yuan3 and Yuan et ... distribution of the open interval and skin). ..... cases are the same as those of multiple slots cases. (PDF) Drag Reduction Using Active and Passive Flow Control ... FC achieves an augmentation in lift and lift-to-drag to reduce the wave drag [18]. ... can be considerably reduced, while either the skin fric- A two-level multi-grid ..... The corresponding pressure distributions and of the shock and suction slot ... Journals PDF | Frontiers in Heat and Mass ... - Thermal-Fluids Central
Home > ; Publications > ; AIAA Journal > ; Volume 13, Issue 8 > ; Skin Friction Reduction by Injection Through Combinations of Slots and Porous Sections Friction Reduction Through Surface Modification