| タイトル | Development and application of a method for predicting rotor free wake positions and resulting rotor blade air loads. Volume 1: Model and results |
| 本文（外部サイト） | http://hdl.handle.net/2060/19720007340 |
| 著者（英） | Sadler, S. G. |
| 著者所属（英） | Rochester Applied Science Associates, Inc. |
| 発行日 | 1971-12-01 |
| 言語 | eng |
| 内容記述 | Rotor wake geometries are predicted by a process similar to the startup of a rotor in a free stream. An array of discrete trailing and shed vortices is generated with vortex strengths corresponding to stepwise radial and azimuthal blade circulations. The array of shed and trailing vortices is limited to an arbitrary number of azimuthal steps behind each blade. The remainder of the wake model of each blade is an arbitrary number of trailing vortices. Vortex element end points were allowed to be transported by the resultant velocity of the free stream and vortex-induced velocities. Wake geometry, wake flow, and wake-induced velocity influence coefficients are generated by this program for use in the blade loads portion of the calculations. Blade loads computations include the effects of nonuniform inflow due to a free wake, nonlinear airfoil characteristics, and response of flexible blades to the applied loads. Computed wake flows and blade loads are compared with experimentally measured data. Predicted blade loads, response and shears and moments are obtained for a model rotor system having two independent rotors. The effects of advance ratio, vertical separation of rotors, different blade radius ratios, and different azimuthal spacing of the blades of one rotor with respect to the other are investigated. |
| NASA分類 | AERODYNAMICS |
| レポートNO | 72N14990
NASA-CR-1911
REPT-69-11-VOL-1 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/204329 |
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