Combustion and trajectory of dispersed micro-sized aluminum particles in a non-premixed methane-air flame
Why this work is in the frame
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Bibliographic record
Abstract
Combustion behaviors of micro-sized aluminum particles were experimentally investigated in a laminar, non-premixed methane-air flame, to understand how the localized flame conditions influence particle ignition, oxidation and transportation. Advanced optical diagnostics, including high-speed imaging and two-color pyrometry, were utilized to measure the particle trajectory, velocity and temperature. A thin filament pyrometry setup, validated by the numerical simulations, was used to characterize the flame environment. Experimental results revealed a clear and distinct performance of individual aluminum particles' combustion, which has been highlighted by the appearances of transient temperature spikes, abrupt trajectory deviation, molten aluminum ejection, and fragmentation. It was found that the particle trajectories and heating rates were strongly correlated to local flame conditions, such as temperature gradients and oxygen availability. Individual particle temperatures were frequently above the local gas temperature, indicating the non-equilibrium effects between the particle-level exothermic processes and the convective and radiative transfer with the surrounding flame. Chemiluminescence imaging further confirmed active oxidation reactions involving AlO radicals at the particle surface. These results demonstrated the critical roles of the local flame structure in controlling the particle-level combustion dynamics and provided insights for the development of metal-fueled combustion systems.
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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