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- W2336405433 abstract "An experimental investigation was completed in the NASA Ames 80- by 120-Foot Wind Tunnel with the objective of studying the aerodynamic characteristics of a tiltrotor at high descent angles in helicopter mode. A specific objective was to determine whether tiltrotors behave differently from helicopter rotors when operating in the Vortex Ring State (VRS). A single, 4-foot diameter, 3-bladed rotor, with twist and solidity similar to that of rotors on current tiltrotor aircraft, was tested with an image plane to simulate the mean effect of a second rotor. Rotor performance data were obtained over a wide range of simulated descent conditions, both with and without a semispan wing. Results of this study are presented, including changes in both mean and oscillatory rotor thrust, which are reasonably consistent with helicopter rotor VRS characteristics. Large reductions in mean rotor thrust were found in VRS. These were associated with high levels of low-frequency rotor thrust fluctuations. The image plane had a significant effect on the results, while the wing had a relatively small effect. Implications of these results for the safe operation of tiltrotor aircraft are discussed." @default.
- W2336405433 created "2016-06-24" @default.
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- W2336405433 date "2001-05-09" @default.
- W2336405433 modified "2023-09-25" @default.
- W2336405433 title "Tiltrotor Descent Aerodynamics: A Small-Scale Experimental Investigation of Vortex Ring State" @default.
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