作者: Larry A. Young
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摘要: Abstract Using a kinetic energy conservation approach, number of simple analytic expressions are derived for estimating the core size tip vortices in near-wake rotors hover and axial-flow flight. The influence thrust, induced power losses, advance ratio, vortex structure on rotor is assessed. Experimental data from literature compared to analytical results this paper. In general, three conclusions can be drawn work First, greater larger near-wake. Second, more efficient with respect smaller resulting size. Third, lastly, initially decreases low ratios, but large ratios asymptotically increases nominal upper limit. Insights gained should enable improved modeling rotary-wing aerodynamics, as well provide framework experimental investigations advanced propeller wakes.