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Effect of degradation of surfactant solutions by age on rheological properties and drag reducing effectiveness
Friction losses in a turbulent flow of water can be substantially decreased by addition of some surfactants. The drag reduction effectiveness depends on the structure of the surfactant, temperature, and the velocity range of the
BK - Mechanika tekutin
- 2004 •
- D
Rok uplatnění
D - Stať ve sborníku
Base-drag reduction of trailer-unit by means of rear-end tapering panels
Base-drag reduction of trailer-unit by means of rear-end tapering panels was studied on the case of 16° panels. The experiment has been performed with the 1:15 model in the wind tunnel. PIV-technique was employed and aerodynamic
JU - Aeronautika, aerodynamika, letadla
- 2003 •
- D
Rok uplatnění
D - Stať ve sborníku
Dependence of drag reduction effectiveness on age of the surfactant solution
The age of the surfactant solution influences substantially effectiveness of drag reduction in a turbulent flow in tubes. In this paper are shown effect of both the surfactant concentration and the ratio of the surfactant to compoun...
BK - Mechanika tekutin
- 2006 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Blowing as a means of drag reduction of wing – strut junction
momentum on the efficiency of the blowing as a mean of the drag reduction.High aspect ratio is well-known mean to diminish induced drag of a wing. The problems with strength and stiffness of a high aspect ratio wing can b...
Aerospace engineering
- 2021 •
- D •
- Link
Rok uplatnění
D - Stať ve sborníku
Výsledek na webu
Similarities and differences in drag reduction behavior of high polymer and surfactant solutions.
Original scientific paper dealing with Similarities and differences in drag reduction behavior of high polymer and surfactant solutions....
BK - Mechanika tekutin
- 1998 •
- D
Rok uplatnění
D - Stať ve sborníku
Wind tunnel test on the Helicopter model focused to the rotor head drag reduction
The report describes the helicopter wind tunnel test focused on the rotor head drag reduction. There were changed parts of the rotor head like the hub cap, sleeves, and the pylon fairing. The collective angles of the blades were cha...
JU - Aeronautika, aerodynamika, letadla
- 2014 •
- O
Rok uplatnění
O - Ostatní výsledky
Contribution of conformal antennas towards sustainable aircraft
This paper shows the drag and emission reduction potential of integrated, flush weight penalty and additional fuel needed due to the drag of the radome and its weight itself have been calculated by two approaches. The obtai...
Aerospace engineering
- 2019 •
- D •
- Link
Rok uplatnění
D - Stať ve sborníku
Výsledek na webu
Effect of surfactant/counter ion ratio on durability and drag reduction effectiveness of micellar solutions
The age of micellar solution influences substantially effectiveness of drag reduction in a turbulent flow in tubes. In this contribution are shown effects of both surfactant concentration and the ratio of the surfactant to the compo...
BK - Mechanika tekutin
- 2007 •
- D
Rok uplatnění
D - Stať ve sborníku
Aerodynamic Optimization of Race Truck for Speed Record
Race truck was aerodynamically optimized for intended speed record. The target was to reduce the aerodynamic drag by approx. 20%. Next to the optimization of front part of the truck, the base drag was reduced by means of tapered rea...
JU - Aeronautika, aerodynamika, letadla
- 2004 •
- D
Rok uplatnění
D - Stať ve sborníku
Durability of a drag reducing solution
Effectiveness of drag reduction by small addition of a surfactant in the turbulent flow of water depends not only on the structure and concentration of the additive, temperature of the solution and turbulence intensity, possible flo...
BK - Mechanika tekutin
- 2008 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
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