Parametric Study on Accelerative Starting of Busemann Air Intakes
Bibliographic record
Abstract
This paper presents a numerical study on the accelerative starting of Busemann air intakes based on the axisymmetrical Euler (inviscid, non-heat-conducting) equations with an accelerative source term. The flow of an ideal gas with constant specific heats is considered. An in-house adaptive unstructured TVD finite volume flow solver is used to conduct intake starting experiments. A systematic parametric study covering the entire dual solution domain between the Kantrowitz and isentropic limits is undertaken. Non-dimensional critical accelerations (the minimum accelerations required to start an intake) are obtained for a wide range of design Mach numbers and indexes of startability (IoS). It is found that the critical acceleration exhibits a power-law growth with decreasing IoS. For a given IoS, the critical acceleration changes non-monotonically, achieving a maximum at a certain Mach number. Curve fits for the numerical data are provided. An order of magnitude estimate of critical acceleration is obtained by comparing the acceleration time and the characteristic time required for a disturbance to propagate through the intake. Within its area of validity, the estimate is in good qualitative correlation with the numerical results and allows to explain how the critical acceleration is influenced by design Mach number, IoS, and intake length.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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 | 0.000 |
| 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 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".