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Studies of Rotor-Airframe Interactions in Forward Flight

机译：前飞中转子 - 机体相互作用的研究

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The helicopter rotor and airframe cannot be treated in isolation if significant improvements in forward-flight performance are to be achieved; rotor-airframe interaction effects must be understood and predictable. Results from an experimental/analytical study of this interaction problem are presented and discussed. The experimental results include mean and periodic pressures on the surface of a cylindrical airframe and measured mean velocity components in the rotor wake. An existing prediction code is used to calculate mean pressures and velocity components which are compared with the experimental results. The impingement of the rotor wake on the airframe causes significant effects with regard to both the mean and periodic pressures. These mean effects are not adequately predicted by an available fully-coupled interaction code in its present form. A comprehensive prediction code must include unsteady effects. (Reprints)

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