Self-similarity in Turbulent Free Jets: A Study of Triangular and Round Jets
Bibliographic record
Abstract
This paper presents experimental findings on a turbulent free jet emanating from an isosceles triangular orifice with a 70 apex angle.Comparative measurements were conducted in a round jet issuing from a sharp-edged orifice and a jet issuing from an isosceles triangular orifice with an apex angle of 10.The Reynolds number, based on the exit centreline velocity and the equivalent diameter of the triangular orifices, or the diameter of the round orifice, was (1.56 0.12) 10 5 .Data were acquired using a DANTEC P51 x-wire hot wire probe calibrated with a Pitot-Static tube.Profiles of mean streamwise velocity, streamwise and spanwise turbulence intensities, and spanwise Reynolds primary shear stresses along the spanwise direction were obtained.Findings indicate that the mean streamwise velocity profiles of the 70 triangular jet achieve self-similarity 10 diameters downstream.The spanwise turbulence intensity and Reynolds primary shear stress achieve self-similarity 15 diameters downstream of the jet exit plane.Additionally, the results suggest that the jets retain their initial conditions within 25 diameters downstream, as profiles other than mean streamwise velocity profiles of the three jets do not collapse onto the same curve.
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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".