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Vortex lattice method
About: Vortex lattice method is a research topic. Over the lifetime, 779 publications have been published within this topic receiving 9242 citations.
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TL;DR: In this article, the impacts of the skewed wake on the unsteady aerodynamic behavior around rotor blade were numerically investigated and a wake deflection mechanism was discussed in detail, for this purpose, the nonlinear vortex lattice method (NVLM) coupling with a time-accurate vortex particle method (VPM) was used.
29 citations
TL;DR: In this article, the authors applied the acoustic theory proposed by Fowcs Williams and Hawkings to the prediction of the pressure fluctuation caused by the volume variations of the propeller cavitation.
29 citations
29 citations
TL;DR: In this article, it was shown that the front wing of the aircraft in a joined-wing configuration should be located on top of the fuselage and the rear wing at the bottom to obtain greater aerodynamic efficiency.
Abstract: J OINED-WING configuration was considered for the first time by Prandtl in 1924 [1] The first attempt to build a joinedwing airplane was undertaken by the Moscow Institute of Aviation in the 1940s, when they redesigned a classic biplane called the Polikarpow Po-2 to create the joined-wing airplane [2] More recently, the configuration was studied by Wolkovitch [3] and Kroo and Gallman [4] in the 1980s A project described in [5] was inspired by these works It consisted of a series of wind-tunnel tests with models of a small transport airplane (see Fig 1) The most interesting result obtained in this project was that a greater L=Dwas achieved for negative angles of attack than for positive ones (see Fig 2) This observation suggests that the front wing of the aircraft in a joined-wing configuration should be located on top of the fuselage and the rear wing at the bottom to obtain greater aerodynamic efficiency This complicates the design because it is not possible to use the fin as a pylon for the rear wing and fuselages usually are not particularly high Anyway, this front-high-joinedwing configuration can be considered in cases of small 2–4 seat general aircraft, small transport aircraft, and very large commercial double-deckers Later, in the 1990s, a few papers on the joinedwing configuration were published [6], most of them focusing on mass-strength analysis
28 citations
TL;DR: In this paper, a finite-state induced-flow model is extended to treat nonlinearities associated with the mass flow induced through the rotor plane, which is then applied to the correlation of a recent set of unsteady, hover laser Doppler velocimetry inflow measurements conducted in the Aeroelastic Rotor Test Chamber at Georgia Institute of Technology.
Abstract: A new three-dimensional, finite-state induced-flow model is extended to treat nonlinearities associated with the mass flow induced through the rotor plane. This new theory is then applied to the correlation of a recent set of unsteady, hover laser Doppler velocimetry inflow measurements conducted in the Aeroelastic Rotor Test Chamber at Georgia Institute of Technology. Although the model is intended primarily as a representation of unsteady aerodynamics for aeroelasticity applications, the results show that it has an excellent capability in predicting the inflow distribution in hover except near the root and tip. In addition, the computed unsteady spanwise lift distribution of a rotor is compared with that from an unsteady vortex lattice method for pitch oscillations at various frequencies. The new model is shown to be capable of prediction of unsteady loads typical of aeroelastic response.
27 citations