Improving vertical-axis turbine efficiency with chordwise actively deforming blades
Bibliographic record
Abstract
This study investigates the effects of employing actively deforming airfoils on the performance of vertical-axis turbines. Two-dimensional unsteady Reynolds-averaged Navier–Stokes simulations were conducted on a single-bladed H-type Darrieus vertical-axis turbine model equipped with a chordwise deforming NACA0015 airfoil. During the rotation cycle, two-thirds of the airfoil’s chord, corresponding to the trailing edge, undergoes prescribed deformations, while the remaining one-third remains undeformed. An overset mesh technique, combined with radial basis function morphing, is used to manage the deformation and movement of the mesh. The study explores the impact of deformation amplitudes and timings on the turbine’s efficiency at various tip-speed ratios. Preliminary simulations evaluating the effect of steady deformation amplitudes on the instantaneous power coefficient are used to identify promising active deformation patterns. Subsequently, the turbine’s performance is assessed using simulations involving two-phase active deformation patterns. The results show a 3.55% efficiency improvement at a near-optimal tip-speed ratio with actively deforming airfoils. More significant relative improvements are observed at low tip-speed ratios, while higher tip-speed ratios yield only marginal benefits.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".