Experimental and Numerical Investigations of Inlet Boundary Conditions for a Propeller Turbine Draft Tube
Bibliographic record
Abstract
The flow at the draft tube inlet of a propeller turbine is investigated via numerical simulations and experimental measurements. Two (2) experimental tools are used in combination to measure the velocity field in this study: 3D-Stereoscopic particles images velocimetry and 2D-laser doppler velocimetry. The numerical simulations are performed with steady RANS as well as URANS with the SST turbulence model. The results show the comparison of the turbulence intensity between experiments and CFD. Further assessment of the draft tube inlet flow is made with LDV to assess the circumferential non-uniformity of the flow. Finally, a complete frequency analysis puts in evidence the helical vortex rope frequency at partial discharge among many other flow phenomena. This study considered three operating points of a propeller axial turbine.
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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".