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Multiple slot skin friction reduction

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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.

Howard, F. G., Hefner, J. N. and Srokowski, A. J., 1975, 6(b). The red region is slightly farther from the wall compared "Multiple slot skin friction reduction", Journal of Aircraft, Vol. Ship Energy Efficiency Measures All of our client commitments, supporting actions, and services delivered must be recognized as expressions of quality. We pledge to monitor our performance as an ongoing activity and to strive for continuous improvement. Amy LANG : Sharkskin Drag Reduction -- Article & patents 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". Toothpaste - Wikipedia

Direct measurements at Mach 6 of turbulent skin-friction reduction by injection from single and multiple flush slots. 14th Aerospace Sciences Meeting. Citation ... Investigation of multiple slot film cooling to a blunt nose cone. 6th Fluid and PlasmaDynamics Conference. Citation | PDF (802 KB) ...

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.

Direct measurements at Mach 6 of turbulent skin-friction ...

Abstract. The paper investigates analytically the effect of multiple slot injection on skin friction for a representative fuselage shape (ogive-cylinder body) and evaluates the potential of slot injection as a drag reduction system in subsonic flow. of Multiple Flush-Slot Injection Into - NASA 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 ... A GENERAL REVIEW OF CONCEPTS FOR REDUCING SKIN … A GENERAL REVIEW OF CONCEPTS FOR REDUCING SKIN FRICTION, INCLUDING RECOMMENDATIONS FOR FUTURE STUDIES By Michael C. Fischer and Robert L. Ash* Langley Research Center SUMMARY A literature survey was conducted to review concepts previously proposed for reducing aerodynamic skin friction, with ah emphasis toward reviewing those with poten- Direct measurements at Mach 6 of turbulent skin-friction … 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.

Piled foundations Adapted from the Foundation section of the GeotechniCAL Reference Manual Author: David Toll (Durham Univ.) Piles generally used because adequate bearing capacity can not be found at shallow enough depths to support the structural loads. It is important to understand that piles get support from both end bearing and skin friction.

Polymer/riblet combination for hydrodynamic skin friction ... Reducing this drag component would have the obvious advantages of increased speed and/or efficiency. One approach to skin friction drag reduction involves the use of long chain polymer molecules, which can reduce up to 80% of the skin friction under ideal circumstances.