Suppression of Flow-Excited Acoustic Resonance in Rectangular Cavities Using Spanwise High Frequency Vortex Generators
Bibliographic record
Abstract
The effectiveness of spanwise high frequency vortex generators in suppressing the acoustic resonance in flow over ducted rectangular cavities is experimentally investigated. Acoustic pressure measurements are performed where it is found that placing a circular rod upstream of the cavity edge can reduce the generated acoustic pressure significantly. By studying the flow structures in the region over the cavity, effective rod configurations can be identified and the effectiveness of this suppression method can be enhanced. Accordingly, hotwire measurements have been performed to understand the interaction mechanism between the shear layer developed over the cavity mouth and the vortex shedding generated by the rod. The velocity distribution along the cavity mid-plane when no rod is placed and when the rod is placed at different locations relative to the cavity upstream edge are discussed. It was found that the most effective rod locations mainly depend on the rod axis location with respect to the upstream edge as well as the vertical gap between the duct wall and the rod.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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 source (direct Gemma or distilled Codex), 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".