A Study on the Fluidelastic Stability of a Hybrid Layout Array in Two-Phase Flow
Bibliographic record
Abstract
Abstract An experimental test program was carried out to investigate the stability behavior of the SG tube bundle in the APR1400 nuclear reactor design. The SG has a unique tube bundle geometry. In the vertical legs of the tube bundle, the tube array has a triangular tube geometry. In the upper U-bend, this geometry gradually changes such that at the upper (horizontal) region of the U-bend, the triangular geometry is replaced by a rotated square geometry. The U-bend itself is rectangular in shape (as opposed to the more common semi-circular form). The rectangular form of the U-bend results in a section of the U-bend where the array geometry is a ‘hybrid mixture’ at the transition from rotated triangle to rotated square geometry. The test section design allows tests to be performed under partial admission conditions where the U-bend tube legs are immersed in water for both the single phase (water) and two-phase (air-water) tests. The transverse and streamwise stability behavior is investigated by limiting the number of tube supports to two in the vertical tubes sections. Tests for this supporting condition show that the SG tube bundle is highly stable. The transverse stability is expected in view of the positive support action in this direction. The tube bundle is also found to be fully stable in the streamwise direction, for flow velocities well above the SG operating flow velocity (dynamic pressure) conditions.
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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".