不同芯块和包壳状态下燃料棒温度场的数值模拟

摘要

Thetemperature Field of fuel rod in different deflected states of concentric,offset and tilt,different dimension states of nominal,maximum,minimum were studied using the FEA software named Simulation.Results show that in pellet’s offset and tilt states relative to clad, its temperature varies against its deflected states comparing with concentric state, pellet’s central temperature decreased slightly with obvious temperature changes on the surface because of pellet’s offset,but very small changes on the inside and outside surface of clad. Results also show that in maximum and minimum dimension states of pellet and clad,significant changes in pellet’s temperature field were obtained comparing with nominal state, pellet’s central and surface temperature varies significantly, and also no obvious changes on the inside and outside surface of clad.%该文采用Simulation软件对燃料棒芯块与包壳同心、侧偏和倾斜状态下的温度场，芯块和包壳在名义、最大和最小尺寸状态下的温度场进行了研究。结果表明：芯块在包壳内的侧偏和倾斜状态下，芯块温度场较同心状态也发生反向的侧偏和倾斜，芯块中心温度略有降低，芯块侧偏引起芯块表面局部温度升降明显，包壳内外壁温度随芯块状态变化很小；芯块和包壳尺寸的最大和最小状态下，芯块温度场较名义状态下变化显著，芯块的中心温度和表面温度均有较大升降，包壳内外壁温度变动不明显。