Effects of hydrogen addition to fuel on soot formation and NOx emission in diffusion flames
Bibliographic record
Abstract
A numerical study of soot formation and NOx emission in axisymmetric coflow laminar methane/hydrogen-air diffusion flame was conducted using detailed gas-phase chemistry and complex thermal and transport properties. To investigate the impact of hydrogen addition, three cases were studied, namely, Case 1, maintaining a constant volume flow of fuel. Case 2, maintaining the fuel heat release rate unchanged, and the fuel nozzle diameter unchanged. Case 3, maintain the fuel heat release rate unchanged, and the fuel jet velocity constant. The results show that, in all three cases, with increasing level of H 2 addition, the flame height decreased, the reaction zone length shortened, residence time shortened, therefore, soot surface growth was inhibited, soot formation reduced, and NO x emissions reduced. Effects of hydrogen addition on soot formation and NO x emissions in Case 2 and Case 3 were much worse than that in Case 1. The results also show that while in reducing soot formation and NO x emission, effect of hydrogen addition in Case 3 was better than that in Case 2.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 source (direct Gemma or distilled Codex), 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".