Effect of DBD Plasma Actuator Geometry and Excitation for Producing Transient Growth Modes in a Laminar Boundary Layer
Bibliographic record
Abstract
This work is concerned with the response of a Blasius boundary layer to plasma actuators for the purpose of using these devices in bypass transition control. The structure of actuator-induced boundary layer streaks is measured using hot-wire anemometry over a streamwise distance of a approximately 100 boundary layer thicknesses, based on a thickness of 4 mm at the point of actuation. Spanwise power spectra of the streamwise disturbance velocity show that 90% of the actuator-induced disturbance energy is contained within a mode related to the spanwise spacing of the exposed actuator electrodes, and its first 3 harmonics. The modal content and corresponding streamwise growth characteristics are discussed for four plasma actuator geometries over multiple excitation voltages in the 3:5 5:5 kVPP range. Actuator output was found to have a closer correlation to actuator power consumption than the excitation voltage. A common relationship between disturbance energy and power consumption was found among actuators of different dielectric thickness and similar electrode geometry. Degradation of the actuators was observed over the course of their running lifetime, causing test cases to diverge gradually from this relationship.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".