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Investigations of Electra KrF laser hibachi foil cooling with small obliquely impinging jets

机译:用小斜射流冷却Electra KrF激光Hibachi箔的研究

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摘要

Electra is a large electron beam pumped KrF laser with transmission foils that separate the vacuum diodes from the laser gas. Active cooling of these foils is important when Electra operates at a rep-rate of 5 Hz because the attenuation of the electron beam by the foil produces a volumetric heating source. A method adopting a large number of locally injected high-speed circular gas jets was explored experimentally and numerically for the purpose of cooling and protecting the hibachi foil with an enhanced convection heat transfer rate. The jets were issued from the openings on two stainless-steel jet tubes parallel to the foil in a fashion such that the two straight lines of jets impinge on the foil obliquely and form a staggered coverage of the foil. CFD simulations were performed to identify the best jet impingement configuration. Bench-top experiments were performed at various jet diameters and jet velocities for a single foil span between two neighboring supporting ribs with a surface heat flux over 20.0 kW/m~2. Heat transfer enhancement of 60-700% over the case with jets turned off was observed depending on jet Reynolds numbers. Experimental Nusselt numbers were well-correlated with jet Reynolds number and the normalized jet-to-foil distance. The study shows that the impinging jets enhance heat transfer from the surface and offer an improved average cooling for a much larger foil area.
机译:Electra是大型电子束泵浦KrF激光器,带有透射箔,可将真空二极管与激光气体分开。当Electra以5 Hz的重复频率运行时,对这些箔片进行主动冷却非常重要,因为箔片对电子束的衰减会产生体积热源。为了提高对流换热率来冷却和保护hibachi箔,实验和数值研究了采用大量局部注入高速圆形气体射流的方法。从平行于箔的两个不锈钢喷射管上的开口发出射流,使得两条直线的射流倾斜地撞击在箔上并形成箔的交错覆盖。进行了CFD仿真以识别最佳的射流冲击配置。在表面热通量超过20.0 kW / m〜2的两个相邻支撑肋之间的单个箔跨上,以各种喷射直径和喷射速度进行了台式实验。根据射流雷诺数,观察到在关闭射流的情况下传热增强了60-700%。实验的Nusselt数与射流雷诺数和归一化射流到箔片的距离密切相关。研究表明,撞击的射流增强了从表面的传热,并为更大的箔面积提供了更好的平均冷却。

著录项

  • 来源
    《Fusion Engineering and Design》 |2012年第4期|352-358|共7页
  • 作者单位

    G W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States,Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China;

    G W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States;

    G W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States;

    G W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    inertial fusion energy; gas laser; hibachi cooling; heat transfer enhancement; impinging jets;

    机译:惯性聚变能气体激光希巴奇冷却传热增强;射流;
  • 入库时间 2022-08-18 00:39:17

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