Study on Nozzle Shape of Radio-Frequency Inductively Coupled Plasma Thruster
Bibliographic record
Abstract
View Video Presentation: https://doi.org/10.2514/6.2021-3381.vid Inductively coupled plasma (ICP) thrusters, which are one kind of electrodeless electro-thermal thrusters, utilizes radio-frequency (RF) electric power to heat propellant gas. In this work, thrust measurement experiments of a 0.5 kW class, ICP thruster model with a de Laval nozzle using argon as propellant gas were conducted. To improve the thrust performance of an ICP thruster, increasing the pressure in a reservoir part (plasma generation part) with an RF induction coil, which is located ahead of the de Laval nozzle, would be adequate. In this study, we assigned two approaches to increase the pressure in the reservoir: one is the decrease in nozzle throat cross section, and the other is the increase in propellant mass flow rate. The experimental results indicated that the thrust force of the ICP thruster model tended to be raised by narrowing the nozzle throat cross section. The results also showed that the increase in mass flow rate for the ICP thruster model raised thrust force, while the effect of mass flow rate on specific impulse varied strongly according to small or large mass flow rate cases. In small mass flow rate of about 10 to 80 mg/s, the increase in mass flow rate deteriorated the specific impulse. In contrast, in large mass flow rate of about 80 to 200 mg/s, it had no practical influence on specific impulse.
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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".