When operating a xenon short arc lamp, tungsten vapour that evaporates from the electrodes is transported by gas convection to blacken the inner bulb wall. Since this reduces the output light intensity and increases the risk of lamp breakage, it is crucial to thoroughly understand the factors that govern gas convection to optimally control it to reduce blackening. Gas convection is complex, especially in horizontal lamps, because it is strongly affected by buoyancy. This study used 3D numerical simulation to investigate buoyancy’s influence on the gas convection of a horizontal xenon short arc lamp, which directly affects the blackening location. Gas convection, especially in the low flow velocity region, was strongly affected by the buoyancy, whose strength was mainly determined by the anode surface temperature. The gas convection in turn affected the bulb wall temperature and the W vapour transport and was reflected in the blackening location. This result indicates that the su...

中文翻译：

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通过3D数值模拟研究浮力对卧式氙气短弧灯气体对流的影响

当操作氙气短弧灯时，从电极上蒸发出来的钨蒸气会通过气体对流传输，从而使灯泡内壁变黑。由于这会降低输出光强度并增加灯泡损坏的风险，因此至关重要的是，全面了解控制气体对流的因素，以最佳地控制气体对流以减少黑化。气体对流非常复杂，特别是在卧式灯中，因为气体对流受浮力的强烈影响。这项研究使用3D数值模拟研究了浮力对卧式氙气短弧灯气体对流的影响，这直接影响发黑位置。气体对流，特别是在低流速区域的气体对流，受浮力的影响很大，浮力的强度主要由阳极表面温度决定。气体对流又影响了灯泡壁的温度和W蒸气的传输，并在变黑的位置被反射。该结果表明，...