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HELICOPTER INCLUDING MEANS FOR CONTROLLING BOUNDARY-LAYER FLOW
HELICOPTER INCLUDING MEANS FOR CONTROLLING BOUNDARY-LAYER FLOW
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机译：包括边界层流量控制装置的直升机
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摘要
An improved helicopter designed to create minimum drag and turbulence in which the main rotor pylon 26 has a top surface 36 having a forward portion 36a defining the rotor head well aperture so as to have a selectively curved lip on the rearward side thereof to eliminate flow separation therefrom of the air being discharged rearwardly from the rotor head well, further having a central portion 36b curving slightly away from the direction of helicopter flight and including a laterally extending boundary layer slot a selected distance downstream of the curved lip through which fluid is expelled substantially parallel to the direction of helicopter flight to energize the surface flow along the pylon top surface, further having a rear portion 36c at a lower elevation extending approximately in the direction of helicopter flight, and having engine and other exhaust ports positioned a selected distance downstream of the boundary layer control slot through which the exhaust fluids are directed over the rear portion in a direction substantially parallel to the direction of helicopter flight, and terminating in a sharp lip 52 to separate the exhaust flow from the pylon surface thereat.
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