Attenuation of Temperature Fluctuations in Thermal Striping
Attenuation of Temperature Fluctuations in Thermal Striping
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DOI：
10.3327/jnst.32.752
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发表时间：
1995-08
影响因子：
1.2
通讯作者：
Mitsuo Wakamatsu;H. Nei;K. Hashiguchi
中科院分区：
文献类型：
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作者：
Mitsuo Wakamatsu;H. Nei;K. Hashiguchi
热条带是由不同温度下的流动混合而产生的随机温度波动。在液态金属冷却快堆(LMFBR)中，由于燃料组件和控制棒的钠冷却剂射流的混合，它发生在上腔。有必要在部件疲劳的情况下考虑温度循环。建立了一个简化的模型来分析从水流到结构表面的温度波动的衰减。将分析结果与模拟上堆芯结构以及燃料组件和控制棒通道冲击射流的实验结果进行了比较。用钠和水作为模拟流体来考察它们的物理性质的差异。表面衰减率随喷流速度的增大而减小。表面温度波动与流体温度波动之比，在水试验中为30-80%，在钠试验中为20-50%。这些费用..。
Thermal striping is random temperature fluctuation generated by the mixing of flow streams at different temperatures. In a liquid-metal-cooled fast breeder reactor (LMFBR), it occurs in the upper plenum as a result of the mixing of sodium coolant jets from fuel assemblies and control rods. It is necessary to consider the temperature cycling in the context of fatigue on the component. A simplified model has been developed to analyze the attenuation of temperature fluctuations from the flow streams to the structure surface. The analytical results were compared with experiments that simulated the upper core structure and impinging jets from fuel sub-assemblies and control rod channels in an LMFBR. Sodium and water were used as simulated fluids to examine the differences in their physical properties. The surface attenuation ratio decreased with the jet flow velocity. The ratio of surface temperature fluctuation to fluid temperature fluctuation is 30–80% in water tests and is 20–50% in sodium tests. These expe...