The Influence of Elliptical Nozzle Holes on Ignition and Combustion of Transient Natural Gas Jets
Bibliographic record
Abstract
Experiments were conducted to compare the mixing and combustion properties of natural gas jets issuing from elliptical and round nozzle holes within an optically accessible combustion bomb. High speed images of combustion events were captured and analyzed along with cylinder pressure and heat release data. Hydrocarbon measurements of the combustion products were used to calculate combustion efficiencies. The elliptical nozzle holes were found to produce a more evenly distributed heat release profile, with a smoother transition from premixed to diffusion burning. The elliptical nozzle jets also produced far more luminous flames. Ignition delay and combustion efficiency were not found to vary significantly with nozzle design. The use of elliptical nozzles as a method of mixing enhancement for gaseous engine fuels remains potentially viable, although further work is necessary to fully quantify the performance and emissions impacts.
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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".