A COMPUTATIONAL STUDY OF A DUAL-MODE RAMJET COMBUSTOR WITH A CAVITY FLAMEHOLDER
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Bibliographic record
Abstract
In this study we use Reynolds-averaged Navier−Stokes (RANS) and large-eddy simulation (LES) combustion models to analyze the flow, fuel injection, mixing, self-ignition, and combustion in a dual-mode ramjet combustor with a cavity flameholder. Comparison with experimental data is used to evaluate the predictive capabilities of the models and to provide additional information about the combustion physics in the dual-mode ramjet combustor. Both the experimental data and the LES results predict two distinct behaviors depending on the value of the stagnation temperature, T0; for To < 1150 K, the flame anchors in the shear layer shedding off the leading edge of the cavity (cavity-stabilized combustion), whereas for T0 > 1350 K the flame anchors just downstream of fuel injection in the jet wake due to heat release at the lower combustor wall (jet-wake-stabilized combustion). For intermediate values, 1150 < T0 < 1350, the flame oscillates between cavity-stabilized and jet-wake-stabilized combustion. The oscillating mode is more difficult to compute simply because the oscillations have a frequency between 20 and 95 Hz, hence requiring long simulation times. Unfortunately, the RANS computations are not successful in capturing the different modes of operation. This deficiency is believed to be caused by the failure to capture the interactions between the flow and the chemical kinetics.
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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