Three-dimensional modeling of the gas field distribution of a high-pressure gas jet used in laser fusion cutting
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Bibliographic record
Abstract
A three-dimensional mathematical model for investigating theoretically the gas flow field distribution of the free exit gas jet from both subsonic and supersonic nozzles under the regime of high-pressure gas-assisted laser fusion cutting is presented in this article. The influence of the flow nonuniformity in the subsonic nozzle exit upon the field distribution in the free gas jet is considered in this model. The calculated results are in good agreement with those observed by shadowgraphy. The relationships between the inlet stagnation pressure and the flow field distribution, incident shock, and normal shock of a gas jet in free space are established. The processing characteristics of the free space gas jet in the high-pressure gas-assisted laser cutting process for both subsonic and supersonic nozzles are analyzed in detail. Compared with that from the subsonic nozzle, such as the commonly used conical or conical–cylindrical nozzle, the gas jet from the supersonic nozzle (Laval nozzle) possesses good features such as uniform distribution, maximum even momentum thrust, and a parallel jet boundary under the condition of the designed “working pressure.”
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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