Influence of pressure and mixture composition on ignition kernel properties in inert and reactive configuration
Bibliographic record
Abstract
The impact of initial pressure and mixture composition was investigated in this study to observe their influence on kernel properties during energy depositing using a sunken fire igniter. Experiments were conducted in a cylindrical combustion chamber using high-speed Schlieren and direct visualizations. Comparison with reference tests performed in pure nitrogen highlighted the influence of composition variation on kernel volume and surface at the end of energy depositing (t = 130 µs). The effect of equivalence ratio was observed to be enhanced by lower pressure conditions. A dominant effect of pressure confirms results from previous studies. Filtered plasma chemiluminescence performed through direct visualization showed a negligible effect of composition and pressure during the first instants of kernel generation (~ 30 µs). Timing of intervening chemical reactions is traced comparing inert and reactive tests. This was done using two approaches. Specifically, the aim was to identify these variations and determine their occurrence in relation to the duration of energy depositing. It was observed that these start appearing already during energy depositing.
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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".