Experimental investigation of airflow over helicopter platform of a polar icebreaker
Bibliographic record
Abstract
The airwake over the helicopter platform of a Canadian Coast Guard (CCG) polar icebreaker was studied experimentally. By application of high speed particle image velocimetry (PIV) on a 1:522 scaled model of the polar icebreaker, quantitative flow filed data were obtained in several vertical and horizontal planes. Present investigation was conducted with two types of the inflow conditions: (i) a uniform flow and (ii) a simulated atmospheric boundary layer (ABL). The incidence angle (α) varied between 0° to 330° with the increment of 30°. The unsteadiness of the flow was demonstrated by calculation of standard deviation of vertical airflow velocity (σ) over the helicopter platform, which directly influences the pilot workload. It was observed that, despite having relatively the same trend in different angels of incidence, the maximum value of σ is generally higher in the case of simulated ABL. It could be attributed to higher velocity gradients in oncoming flow associated with the simulated ABL inflow condition. Additionally this investigation showed that, in both inflow conditions, incidence angles of 0° and 300° were associated with the highest values for σ.
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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".