Pressure fluctuations under a turbulent boundary layer with transpiration cooling
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Bibliographic record
Abstract
View Video Presentation: https://doi.org/10.2514/6.2021-2605.vid Transpiration cooling is an active thermal protective system (TPS) increasingly used in space applications under high thermal loads. A coolant gas is effused through a porous wall into a turbulent boundary layer (TBL) via a pressure gradient. The pressure fluctuations at the wall above the transpiration region result in temporal and spatial modulation of the flow within the porous flow network. This work quantifies the pressure fluctuations at the wall in transpiration cooling through the analysis of a direct numerical simulation (DNS) database. The pressure distributions compare favorably to existing analytical near-wall pressure fluctuation models. It is found that the while the addition of blowing does somewhat impact the shape and magnitude of the resultant spectrum, the Liepmann analytical model still yields a sufficient approximation within the resolved range.
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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) | 0.001 | 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