Development of wall-stabilized arc of water-cooled vortex type with small caliber for high intense radiation

摘要

Summary form only given. The problem of an emergency large-scale illumination with the high-intensity discharge (HID) lamp is the lack of radiation intensity because of inappropriate energy balance. Some researchers have researched that the radiation power depended on the arc temperature increases with increasing the current. However, the heat loss as well as the radiation power increases with increasing the current excessively. Moreover, the lamp efficiency decreases with increasing the current excessively because of ultra violet rays increment. It is necessary that the arc volume increases while the arc temperature maintains a high temperature with the low current. Therefore, the arc temperature is controlled by changing the wall radius in order to increase the radiation power. However, the wall is melted by a high temperature when the wall radius is narrowed. In this paper, the wall-stabilized arc of water-cooled vortex type with small caliber for high intense radiation is developed. As a result, the arc temperature at small caliber is higher than that at large caliber. However, the radiation power decreases because the arc volume decreases with small caliber. Therefore, the appropriate caliber plays an important role for the wall-stabilized arc.