Numerical study on the combustion and emission characteristics in a direct-injection diesel engine with preheated biodiesel fuel
Bibliographic record
Abstract
The effect of the biodiesel fuel injection temperature on the combustion and emissions characteristics is investigated numerically in a direct-injection diesel engine. In this three-dimensional simulation study, methyl butanoate (MB) is applied as the surrogate of biodiesel fuel, and a detailed chemical kinetic mechanism of MB containing 41 species and 150 reactions is implemented. The results indicate that preheating the biodiesel fuel plays an important role in the spray and atomization processes, especially when the engine operates under the low-temperature condition. Furthermore, the in-cylinder flow turbulence kinetic energy increases and the flame lift-off length shortens with an increase in the fuel injection temperature. The increase in the fuel injection temperature results in a decrease in the equivalence ratio in the fuel-rich area. The results also reveal that both soot and nitrogen oxide emissions are reduced by preheating the biodiesel fuel.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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".