Abstract:

An experimental study of heat transfer was carried out in the hyper-vapotron loop-Ⅰ(HVL-Ⅰ) test facility. Phenomena of subcooling were observed using the techniques of planar laser induced fluorescent (PLIF), high speed photography, particle image velocimetry, etc. The flow and condition parameters were as follows: (1) CuCrZr alloy material, (2) triangle and rectangle fin structures, (3) inlet subcooling temperature of 296K, (4) Rhodamine solution flow velocity of 0.3~0.5m•s⁻¹. It was found that the heat transfer coefficient (HTC) of rectangle fin is 1.3～1.5 times higher than the triangle fin under the same tested conditions. Furthermore, the heat transfer efficiency is extraordinary dependent on the maintain time of vortex forming between the fins.

Key words: Hyper-vapotron structure, Planar laser induced fluorescence, Particle image velocimetry, Heat transfer

摘要：

搭建了常压水超汽化实验回路(HVL-Ⅰ)，采用平面激光诱导荧光(PLIF)、高速摄影、微距摄影、粒子成像测速(PIV)等先进测量技术，开展聚变堆面对等离子体部件(第一壁、偏滤器)在高热流过冷沸腾工况下强化换热特性实验研究。选择三角形和矩形翅片的铬锆铜超汽化样件，实验工况为常压室温(296K)，若丹明B 水溶液流速 0.3～0.5m•s⁻¹ 连续可调，热流密度～5MW•m⁻²。实验结果表明同等工况下，矩形翅片比三角形翅片换热效果显著增强，性能提升约30%～50%。微距摄影显示翅根涡流形态保持时间越短，越有利于小汽泡充分扩散，从而使换热得到强化。

关键词: 超汽化样件, 激光诱导荧光, 粒子示踪, 强化换热