科研之友
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摘要
During a loss of vacuum accident (LOVA) in fusion device, the migration of dust may bring the risks of hydrogen explosion, dust explosion and radioactive hazards. Therefore, it is necessary to study the dust migration during a LOVA, so as to provide theoretical basis for the mitigation or elimination of the risks. Based on the STARDUST numerical model which has proved to be valid, the migration process of dust during a LOVA was reproduced by computational fluid dynamics method. Considering different kinds of dust composed of carbon and lithium particles with different sizes, crevasse positions and the existence of obstacles, the influencing factors were studied. It is found that for the same kind of dust with different diameters, the distribution of dust is more similar to the velocity field of gas when the dust diameter is smaller and that for different kinds of dusts with the same diameter, the distribution of dust is more similar to the velocity field of gas when the density of the dust is smaller. The simulation results also show that during a LOVA, the dust distributions in the vacuum vessel are different when the crevasse positions vary and that the existing of obstacles can limit the migration of dust obviously. This research can provide support for the follow-up study on the migration characteristics of dust in fusion device.
- 出版日期2015-6
- 单位上海交通大学
