Numerical and Experimental Analysis of the Airflow Inside an A250 Diffuser Tube
Bibliographic record
Abstract
The diffuser tube of the Allison 250 gas turbine has been investigated in this paper. It consists of a diverging conical section that transitions into a constant diameter S-shaped tube, and connects the exit of the compressor to the inlet of the combustion chamber. The shear stress transport model (SST) in ANSYS-CFX has been used for the numerical prediction of the flow and an experimental rig was built in order to collect data in four directions and at three stations along the diffuser tube. The calculated results perfectly matched the experimental data. The development of the stream-wise velocity profile, the velocity contours at different stream-wise stations, and the friction and pressure coefficients were calculated and discussed. A secondary flow in the plane of the cross-section has thus been evidenced, and resulted in a shift towards the outer wall of the first bend of the region of the flow where the velocity is greatest. It has also been shown that the friction coefficient decreased as the Reynolds number was increased, while the opposite trend was observed for the pressure coefficients. The effect of the inlet turbulence intensity on the main flow features was generally small.
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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 | 0.000 |
| 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 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".