Film cooling performance of shaped hole over vane with flow visualization
Bibliographic record
Abstract
The cooling performance of a shaped hole is investigated experimentally using a two-dimensional turbine vane cascade. The test section is designed to match Mach numbers, Reynolds numbers, pressure distributions, passage mass flow rates, boundary layer development, streamline curvature, and physical dimensions of turbine airfoils in operating gas turbine engines for industrial power generation. The test section walls are made of acrylic for the optical measurements with inlet cross section area of 10 cm by 5.4 cm. One row of laid-back fan-shaped axially-oriented cooling holes is located on the pressure side. The main stream Reynolds number based on the axial chord is 1.4E5 and inlet Mach number is 0.16. The local distributions of the heat transfer coefficient and film cooling effectiveness is obtained using a transient Thermochromic Liquid Crystal (TLC) technique for four different blowing ratios. The effectiveness of the shaped holes increases by the increase of the blowing ratio with a slight reduction on the heat transfer enhancement. The nature of the flow interaction between jet and mainstream is clarified using Particle Image Velocimetry (PIV) to support the heat transfer findings.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".