4/25/2023 0 Comments Rotor blades in forward flightCoupling the reversed-flow model and the vortex-blade aerodynamic interaction model with the viscous vortex-particle method is used to simulate the complex wake of the coaxial rotor. The model considers the unsteady pressure term induced on a blade by tip vortices of other blades, and thus accounts for the aerodynamic interaction between the rotors and its contribution to the unsteady airloads. Moreover, vortex-blade aerodynamic interactions are accounted for. To account for reversed flow, shedding a vortex from the leading edge is used rather than from the trailing edge. In this method, a reversed-flow model for the retreating side of the coaxial rotor is proposed based on an unsteady panel technique. In this article, an unsteady aerodynamic analysis based on a vortex particle method is presented. Simulating the unsteady aerodynamic loads for a coaxial rotor, including the aerodynamic interactions between rotors and rotor blades, is an essential part of analysing their vibration characteristics. Nevertheless, issues related to rotor-head drag, aerodynamic performance, wake interference, and vibration should also be considered. Recent advances in coaxial rotor design have shown benefits of this configuration.
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