Measurements of the vortex structure in the wake of a scale helicopter rotor in forward motion
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Bibliographic record
Abstract
This paper provides experimental insight into the vortex structures that form in the wake of a scale helicopter rotor in forward motion. Time-resolved stereoscopic particle image velocimetry was used to capture the vortices that form on the advancing and retreating sides of the rotor at an advance ratio of 0.20. The rotor radius was R = 425 mm and its two blades with chord length c = 35 mm spun at 1,500 RPM, resulting in a Reynolds number of U tip R / ν = 1.7 × 10 6 ( U tip c / ν = 1.4 × 10 5 ) where U tip is the blade tip speed. The collective, lateral cyclic, and longitudinal cyclic pitch settings were varied one at a time. The structure of vortices measured in the wake was compared to reference paths that we expect the vortices to take if they advect into the wake at a constant velocity without interaction. We find that the vortices on the retreating side of the rotor closely match the reference paths. Conversely, the vortices on the advancing side often exhibited large deviations from the paths. The vortices on both sides of the rotor had opposite directions of rotation when the collective pitch setting was varied. In contrast, varying the lateral and longitudinal cyclic pitch resulted in the formation of vortices with the same direction of rotation on the advancing and retreating sides. Notable vortex formation was observed on both sides of the rotor when the lateral cyclic pitch setting was varied, while vortex formation was dominant on the advancing side when varying the longitudinal cyclic pitch.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it