Effect Of Geometrical Configuration On Cavity Dynamics In Planar Cavitating Venturis
Bibliographic record
Abstract
The nature and the dynamics of the cavitation zone in a cavitating venturi are of interest to researchers for correctly predicting the venturi performance under varied operating conditions.The current work presents the influence of the throat configuration and low divergence angle on the cavity dynamics in planar cavitating venturis.The work presents results from Discrete Fourier Transform (DFT) and Spectral Proper Orthogonal Decomposition (SPOD) applied on shadowgraphy images from quasi-steady experiments.In the current work, we have used four planar venturis with different divergent half-angles and throat configurations for the study.Quasi-steady experiments have been conducted for a Pr range of 0.21 to 0.95 and an inlet Reynolds number range of 7.310 4 to 2.1810 5 .In our earlier work using 8 o (divergent half-angle) venturi, three different frequency behaviours at different pressure ratios (Pr, the ratio of absolute back pressure to inlet pressure) were experimentally observed.The cavitation zone showed low frequency oscillations (corresponding to partial shedding) at high Pr, a mix of low and high frequency oscillations at intermediate Pr and high frequency oscillations (corresponding to cloud cavitation) at low Pr.This venturi has been considered as the reference case for the present studies.The experimental observations show that the geometrical parameters significantly alter the cavity dynamics.The present experiments using a 3 o (divergence-half angle) planar venturi showed only low frequency oscillations induced by partial shedding.The experimental evidence from the other two planar venturis shows that the throat configuration (length and width of the throat) also significantly alters the cavity dynamics.For this study, two planar venturis with the same divergence angle but different throat configurations as the reference venturi have been used.An increase in the throat width in one venturi and a reduction in the throat length in the second venturi is observed to promote high frequency cloud shedding behaviour.Increasing throat width and decreasing throat length shifts the mix frequency regime towards high Pr (compared with the reference case).In the first venturi with no finite throat length, the low frequency oscillations are absent.The difference in the cavity dynamics can be attributed to the reduced boundary layer effects due to the reduced throat length.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
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