A smooth-guiding method for aerodynamic drag reduction on key regions of a high-speed train
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Bibliographic record
Abstract
Bogie and pantograph areas are the important sources of the aerodynamic drag for high-speed trains. In this study, a smooth and fully encapsulated structure in bogie areas and a teardrop deflector in pantograph areas were designed to improve the train aerodynamic performance. Herein, two different three-car grouping high-speed train models were employed, i.e., Models I and II. The numerical simulations were carried out using an improved delayed detached eddy simulation (IDDES) method. The results show that after installing the smooth and fully encapsulated structure in bogie areas, the aerodynamic drag coefficients of bogie regions of the head and tail cars are reduced by 59.4% and 57.0%, respectively. In addition, the wake flow of the high-speed train is improved as well. The similar reduction is observed in the pantograph area. After installing the teardrop type deflector, the airflow over the pantograph area becomes smoother, which contributes to 45.6% aerodynamic drag reduction in the pantograph area. Therefore, combining with the smooth and fully encapsulated structure and teardrop type deflector, the Model II achieves an aerodynamic drag reduction of 17.3%.
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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 | 0.001 | 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 it