Study on Effective Distance of Supersonic Molecular Beam Injection System for HL-3 Tokamak
Notice bibliographique
Résumé
Supersonic molecular beam injection (SMBI) technology, an indigenous fusion fueling technique in China, have been implemented widespread in international nuclear fusion devices. The effective distance stands out as a pivotal parameter for the system, defined by the span between the injector outlet and the front of the first Mach disk. Notably, the effective distance of SMBI on fusion devices must surpass the expanse from the injector outlet to the plasma boundary. This study conducted an in-depth investigation into the application of the SMBI system within nuclear fusion devices, with a specific focus on analyzing how gas source pressure affects the effective distance of the beam, which is crucial for ensuring the supersonic beam’s efficient penetration to the plasma boundary. To achieve this, a hybrid approach combining computational fluid dynamics (CFD) simulation with experimental testing was employed. The design of the SMBI system was based a modified conical structure developed from the Laval nozzle structure, which was modeled using SolidWorks and then subjected to detailed fluid dynamics simulations within the Fluent software environment. These simulations were aimed at examining the impact of varying cone angles and gas source pressures on the airflow’s velocity and density distribution. The results from the simulations indicate that while the cone angle of the injector has a limited effect on the effective distance, the gas source pressure is a decisive factor. Research is found that the effective distance is directly proportional to the square root of the gas source pressure, a finding that aligns with existing scaling relationships within a certain pressure ratio range. However, beyond the conventional scaling range of 5 to 17 000, the existing relationships are found to be insufficient for accurately predicting the effective distance at higher pressure ratios. In response to this, the study introduced a novel scaling relationship that was applicable to a broader pressure ratio range, specifically from 10 000 to 50 000. This new relationship was validated through experimental testing, confirming the accuracy of the simulation outcomes. Particularly within the HL-3 Tokamak, it is demonstrated that even at the minimum gas source pressure of 9×104 Pa, the effective distance achieved is adequate to fulfill the requirements for fusion fueling, ensuring that the beam maintains supersonic characteristics throughout its journey from the injector exit to the plasma boundary. This research significantly contributes to the field by providing valuable insights for the design of SMBI systems, taking into account the broader pressure ratio range that is often encountered in practical nuclear fusion applications. The findings not only validate the simulation methods used but also offer a scientific foundation for the design and optimization of SMBI systems in other magnetic confinement fusion devices, paving the way for more efficient and effective fueling strategies in nuclear fusion research.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,001 | 0,001 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».