对流传热对冷冻靶温度影响的数值分析
Numerical analysis of convection heat transfer effects oncryogenic target temperature
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摘要: 利用计算流体力学的程序Fluent，以法国的兆焦激光装置LMJ为原型，研究了惯性约束聚变间接驱动靶中黑腔内填充气体的自然对流传热效应对靶丸温度分布的影响；通过在黑腔内加入聚合薄膜，减小靶表面的温度不均匀性，得到了最佳腔体分隔模式；并在分隔成7个分区的腔体中，结合调整黑腔壁上下冷却环的温度，当两冷却环之间存在±0.5 mK 的温差时，使得靶丸表面的温度均匀性最终能够满足聚变的要求。Abstract: The effect of the filling gas natural convection in the French Laser Mega Joule(LMJ) hohlraum on the target temperature distribution has been studied with a CFD code (Fluent). In order to reduce the temperature nonuniformity around the target, the division of the hohlraum with polymer membranes has been simulated to obtain the optimum division mode. In combination with the correct temperatures of the two cooling rings with a temperature difference of ±0.5 mK between them, the seven gas-division mode can meet the uniformity requirement of cryogenic target in the inertial confinement fusion.
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Key words:
- cryogenic target /
- indirect drive /
- natural convection /
- division mode
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