A numerical analysis of aluminum droplet combustion driven instabilities in solid rocket motors
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Bibliographic record
Abstract
Acoustic coupling with unsteady aluminum particle combustion may lead to self-sustained instabilities with large oscillation amplitudes in a solid rocket motor. A numerical analysis of this phenomenon is carried out for instabilities and at instability limit cycles in a set of generic configurations. It is found that the synchronized combustion oscillations can be split in two different contributions to heat release disturbances driving the instability. In the combustion volume, volumetric heat release rate fluctuations result from the cumulative contribution of burning rate oscillations of each individual aluminum droplet experiencing an oscillating drag. The second contribution to heat release oscillations in the SRM corresponds to the motion of the aluminum combustion zone boundary. In the configurations explored, this contribution may reach up to about 40% of the total heat release rate oscillation in the motor and is shown to depend on the way the end life of aluminum droplets is modeled.
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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 | 0.003 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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 it