Tip flow evolution in a turbofan rotor for broadband noise diagnostic
Why this work is in the frame
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Bibliographic record
Abstract
A tip flow evolution in a realistic turbofan rotor is studied numerically for subsonic (approach) and transonic (cutback) operating conditions. Large Eddy Simulations are performed for Source Diagnostic Test benchmark rotor blade. Single-blade computations are performed for the two operating conditions. The mean-flow results and the wall-pressure statistics are analyzed in the tip flow region of the rotor. The mean trajectory of the tip leakage vortex is traced in both cases. The mean results reveal the presence of a strong tip blockage at approach. For cutback, the flow in the upper part of the blade produces a shock-boundary layer interaction with a lambda-shock. At approach conditions, the unsteady results show an early break-up of the tip leakage vortex and an impingement of the tip vortices with the leading-edge and the tip region of the blade. At cutback the tip leakage vortex is stronger and interacts with the leading edge of the adjacent blade. The blade wall-pressure spectra reflect the impact of the tip vortices on the blade leading-edge. The far-field noise is computed upstream with FfowcsWilliams and Hawkings’ analogy using porous surface formulations. Downstream, the projection on acoustic duct modes is made to remove hydrodynamics spurious sources. Both methods showed a good comparison with experiments for the middle frequency range.
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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