High speed is the development direction of future helicopters.The aerodynamic interac-tion characteristics of the dual-thrust compound high-speed helicopter in hovering state were com-putational investigated.The CFD method based on the actuator disk was used to the whole aircraft trim in hover and numerical simulation of the flow field of the rotor,propeller,fuselage in the com-bination of the whole aircraft and the combination of the two,the isolated state of the components and compared performance and flowfield to obtain the interaction relationship between the compo-nents.The results showed that the blocking effect of the fuselage and the wing on the rotor downwash under hovering caused the rotor thrust to increase,and the propellers on both sides also caused the rotor thrust to increase,and finally the rotor thrust increased by 4.2％,and the hovering efficiency increased by 4％.At the same time,the fuselage not only subjected to the downward load produced by the rotor downwash,but also further experienced an increased downward load due to slipstream of right propeller.The thrust of both propellers increased significantly after the rotor downwash flow.However,due to the interactions of wings,the thrust of left propeller decreased by 0.8％ while the thrust of the right propeller increased by 45.6％.
关键词
气动干扰/悬停状态全机配平/数值模拟/性能变化/高速直升机
Key words
aerodynamic interaction/trim in hover/numerical simulation/performance variation/high-speed helicopter
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