The impact of speed variation on the stability of variable speed axial compressors at efficient operating points
Bibliographic record
Abstract
In the case of variable speed axial compressors, it is a matter of great importance to investigate the impact of speed variations on surge and stall transients. In spite of the important research on this subject, the qualitative behavior of variable speed axial compressors and the development of an effective controller are still challenging problems. The present paper studies the impact of speed transitions on the stability of high efficiency operating points being near to the fully developed rotating stall zone. Effects of throttle gain and acceleration rate as the bifurcation parameters of the model are also addressed to demonstrate the richness of nonlinear dynamics. Another key parameter, which affects the qualitative behavior of the system, is gas viscosity. The impact of gas viscosity is investigated as well. Time-domain simulation and bifurcation analysis as two standard and complementary methods for describing the qualitative behavior of systems are employed here. Outcomes reveal that speed transitions causing temporary stall harmonics, can drive the system to undesirable fully developed stall zone. This phenomenon threatens the stability of high efficiency operating points during speed transitions. Therefore, a need arises to develop an effective control approach being capable of simultaneously suppressing stall and achieving rapid acceleration.
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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 | 0.001 | 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 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".