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Flow surface for a three-dimensional boundary layer flow; especially on an arrow-shaped wing, an arrow-shaped tail plane or a rotor
Flow surface for a three-dimensional boundary layer flow; especially on an arrow-shaped wing, an arrow-shaped tail plane or a rotor
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机译:流动表面为三维边界层流动;特别是在箭形机翼,箭形尾翼或旋翼上
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摘要
A flow surface (16), e.g. on a swept aircraft wing, has a three-dimensional boundary-layer flow. The surface is defined by a spanwise direction (z) and a chordwise direction (x). In or on the flow surface excitation locations (22) are arranged, exciting primary disturbances (24). The invention is characterized in that the excitation locations (22) are arranged such that benign steady primary disturbances are excited and maintained on a sufficiently high amplitude level as longitudinal vortices respectively crossflow vortices, suppressing naturally growing nocent primary disturbances by a non-linear physical mechanism. The benign primary disturbances preserve a laminar flow, such that unsteady secondary disturbances, which may initiate turbulence and which, otherwise, are excited in streamwise direction by nocent primary vortices, are suppressed or at least stabilized.
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