INFLUENCE OF AXIAL GAPS ON FORCED RESPONSE OF DIFFERENT MODE SHAPES IN A LOW-PRESSURE COMPRESSOR
Bibliographic record
Abstract
Forced-response vibrations present an ongoing challenge in compressor design. This is especially apparent when axial-gap variations are considered: narrower gaps come with the benefit of a lower component weight. From the standpoint of aeroelasticity, however, this typically causes a stronger wake-induced excitation. Conversely, recent results have demonstrated an increased excitation of certain mode shapes with increasing axial gap. This paper investigates how the forced response of different mode shapes is affected by operating-point-related and design-related changes of the excitation source. Extensive time-linearised simulations are conducted at various off-design operating points with different mode shapes. Fourier-transformed gust boundary conditions are considered as the excitation source. The reduced frequency is identified as the determining factor for the sensitivity of the aerodynamic work with respect to axial-gap variations. Three reduced-frequency regimes are identified: moderate sensitivity for low reduced frequencies, low sensitivity for moderate reduced frequencies, and high sensitivity for high reduced frequencies. The cases with an inverse behaviour of the aerodynamic work with respect to the axial-gap variation are shown to occur in the low-sensitivity regime. It is demonstrated that they are a result of changes in the interaction of the incoming wakes with the rotor potential field.
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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".