Study on quasi-two-dimensional submerged vertical over-expanded supersonic jets
Bibliographic record
Abstract
Quasi-two-dimentional submerged vertical over-expanded supersonic jets were studied experimentally and numerically.The gas-jet flow patterns under over-expanded conditions were recorded at real time by a high-speed camera at the rate of 1000 frames/s.The development process of supersonic gas jets and the process of the instable flow pattern were visualized clearly.The pure gas flow field inside and outside the Laval nozzle used in the experiment was numerically simulated by FLUENT,and results dedicate a complex shock wave region existing out of the nozzle exit.The simulation results are instrumental in understanding the unstable pattern of submerged vertical supersonic jet flow as an aided reference.The experimental and simulation results indicate that,the frequency of back-attack will be reduced at the operating conditions of relatively small mass flow and a high Mach-number,and this is proved by the discovery of quasi-back-attack phenomenon.The finding in the paper provides an available theroretical reference for weakening or eliminating the cavitation erosion in engineering application field.
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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 | 0.001 |
| 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".