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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01 Mar 1974
TL;DR: In this paper, a box-shaped ground vehicle was used to simulate the aerodynamic drag of delivery vans, trucks, and motor homes, and a coast-down method was used for defining the drag of this vehicle in a configuration with all square corners and a modified configuration with the four vertical corners rounded.
Abstract: A box-shaped ground vehicle was used to simulate the aerodynamic drag of delivery vans, trucks, and motor homes. A coast-down method was used to define the drag of this vehicle in a configuration with all square corners and a modified configuration with the four vertical corners rounded. The tests ranged in velocity from 30 miles per hour to 65 miles per hour, and Reynolds numbers ranged from 4.4 x 1,000,000 to 1.0 x 10 to the 7th power based on vehicle length. The modified configuration showed a reduction in aerodynamic drag of about 40 percent as compared to the square cornered configuration.
18 citations
15 Dec 2010
TL;DR: In this paper, the aerodynamics of finite wings are analyzed using the classical lifting line model, which allows a closed-form solution that captures most of the physical effects applicable to finite wings.
Abstract: In this chapter, the aerodynamics of finite wings is analyzed using the classical lifting line model. This simple model allows a closed-form solution that captures most of the physical effects applicable to finite wings. The model is based on the horseshoe-shaped vortex that introduces the concept of a vortex wake and wing tip vortices. The downwash induced by the wake creates an induced drag that did not exist in the two-dimensional analysis. Furthermore, as wingspan is reduced, the wing lift slope decreases, and the induced drag increases, reducing overall efficiency. To complement the high aspect ratio wing case, a slender wing model is formulated so that the lift and drag can be estimated for this limiting case as well. Finally, a brief survey of panel methods is presented. These methods are capable of solving the potential flow over complex (and thick) lifting configurations. The solution, however, can be obtained by using numerical methods only.
Keywords:
aerodynamics;
wings;
slender wings;
lifting line;
induced drag;
panel methods;
aspect ratio
18 citations
TL;DR: In this article, a design study of wing tip devices at high and low speeds is described, based on an equivalent drag approach containing both aerodynamic drag gain and structural weight penalty, and the results of the most effective wing tip designs are analyzed at both flight conditions.
18 citations
01 Jul 2007
TL;DR: In this article, a new CFD-based method aimed at predicting wind turbine aerodynamics, where velocity and pressure discontinuities are used to model the vortical system that creates lift on the turbine blades.
Abstract: This paper presents the recent developments of a new CFD-based method aimed at predicting wind turbine aerodynamics, where velocity and pressure discontinuities are used to model the vortical system that creates lift on the turbine blades. To illustrate the ability of the present model to predict induced wake effect, the case of the taper wing is thoroughly analyzed and effects of both domain discretization and convection scheme are presented. Results are mitigated regarding predicted performance of induced drag, but accurate induced and upstream flow angles values are obtained. The method is even shown to be a useful calculator for the relationship between inflow angle measured upstream and effective angle of attack of a wing section. Interesting results for the NREL phase VI rotor have been obtained showing improvement of the method upon actuator-disk approach in handling tip vortices effect on the blade aerodynamics.
18 citations
18 citations