Topic
Lift-induced drag
About: Lift-induced drag is a research topic. Over the lifetime, 2861 publications have been published within this topic receiving 41094 citations.
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TL;DR: In this article, the authors show that the drag associated with laminar Stokes flows can be reduced for spheres with nanostructured superhydrophilic as well as super-hydrophobic surfaces.
Abstract: Nanostructured surfaces offer opportunities to modify flow induced drag on solid objects. Measurements of the terminal velocity reveal that the drag associated with laminar Stokes flows can be reduced for spheres with nanostructured superhydrophilic as well as superhydrophobic surfaces. Numerical simulations suggest that the formation of recirculating or nearly stagnant flow zones leads to significant reduction in the friction drag. Such reduction, however, is offset by an increase in the form drag that arises from nonuniform pressure distributions. Our work motivates further studies to optimally balance the friction and form drag and control resistance to laminar flows over objects with nanostructured surfaces.
34 citations
Patent•
10 Aug 2004
TL;DR: In this paper, an improved method and device for the reduction of aerodynamic drag and for improved performance of multiple component vehicles by reducing the pressure on the front face of the trailing vehicle or vehicle component by controlling the flow in the gap between the leading vehicle component and a trailing vehicle component is presented.
Abstract: An improved method and device for the reduction of aerodynamic drag and for improved performance of multiple component vehicles by reducing the pressure on the front face of the trailing vehicle or vehicle component by controlling the flow in the gap between the leading vehicle component and the trailing vehicle component. An improved method and device for generating a reduction in the drag force on a bluff face object moving through air. The apparatus consist of a plurality of forward extending surfaces that are positioned adjacent to one another on the forward facing surface of a bluff face object and are aligned parallel to the object center line and perpendicular to the local flow direction. The reduction in drag force results from the summation of a plurality of local reductions in drag force generated by the interaction of vortex structures emanating from the leading edges of the plurality of forward extending surfaces with the forward facing surface of a blunt face object. The objects and advantages also extend to other applications in which an object or vehicle is moving through either a gas or fluid.
33 citations
01 Oct 1980
TL;DR: In this article, the advantages of replacing the conventional wing on a transatlantic business jet with a larger, strut braced wing of aspect ratio 25 were evaluated and the lifting struts reduced both the induced drag and structural weight of the heavier, high aspect ratio wing.
Abstract: The advantages of replacing the conventional wing on a transatlantic business jet with a larger, strut braced wing of aspect ratio 25 were evaluated. The lifting struts reduce both the induced drag and structural weight of the heavier, high aspect ratio wing. Compared to the conventional airplane, the strut braced wing design offers significantly higher lift to drag ratios achieved at higher lift coefficients and, consequently, a combination of lower speeds and higher altitudes. The strut braced wing airplane provides fuel savings with an attendant increase in construction costs.
33 citations
TL;DR: In this article, the authors used surface dielectric barrier discharge actuators to reduce the drag of a car geometry using a simplified car geometry and achieved up to 8% drag reduction by suppressing the separation bubble above the rear window.
Abstract: The aim of this study is to reduce the drag of a simplified car geometry using surface dielectric barrier discharge actuators. Experiments were conducted in a wind tunnel for a low Reynolds number (6.7.105) with the Ahmed body reference (rear slant angle of 25°, zero yaw angle). The effect of steady and unsteady actuation on the flow topology was investigated carrying out 2C-PIV and 1D hot wire measurements. The efficiency of the actuators was characterised by stationary balance measurements. Drag reductions up to 8% were obtained by suppressing the separation bubble above the rear window. The results suggest that plasma actuators are simple to implement on a model and can provide useful information for automotive aerodynamics through parametric studies with parameters relevant for flow control (position, surface, frequency and duty cycle of the pulsed actuation).
33 citations
TL;DR: In this article, two different types of side skirts with flaps or additional inclined inner panels were proposed to maximize the underbody flow in heavy vehicles, and the effects of these devices were quantitatively evaluated by wind tunnel tests and computational fluid dynamics analysis.
33 citations