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首页> 外文期刊>Thermal engineering >Verification of the Mathematical Model and Numerical Investigation into the Thermal-Hydraulic Parameters of Fuel Assemblies Containing Microspherical Fuel Elements
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Verification of the Mathematical Model and Numerical Investigation into the Thermal-Hydraulic Parameters of Fuel Assemblies Containing Microspherical Fuel Elements

机译：含微球形燃料元件的燃料组件的热力学参数的数学模型验证和数值研究

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The article presents the results from numerical investigations into the hydrodynamics and temperature field in the KLT-40S reactor’s fuel assembly (FA) in the case of using microspherical fuel elements as nuclear fuel. The simulated FA has the same overall dimensions as the existing FA containing fuel rods, due to which it can be accommodated in the reactor core without the need of modifying the reactor design. The specific feature of an FA with micro fuel elements (MF FA) is the need to set up radial flow of coolant through the bed of micro fuel elements, which is achieved by using distribution and collection headers. The numerical simulation was carried out using the ANSYS Fluent computer code. The mathematical model implemented in the code has been refined and verified against the experimental data obtained by the authors on a model experimental setup whose design is similar to that of the considered FA containing micro fuel elements. Radial flow of coolant through the pebble bed is arranged in the model installation. The numerical and experimental data on pressure loss and temperature distribution in the bed estimated at different values of coolant mass velocity mass are compared with each other. The design of an FA containing micro fuel elements for the KLT-40S reactor is proposed. It has been found that almost purely radial flow of coolant can be set up with the perforation parameters (cross-section coefficients) higher than those mentioned in the literature. The serviceability of such a fuel assembly is demonstrated. The distributions of temperature, excess pressure, and coolant velocity and current lines are obtained. The perforation parameters of jackets confining the bed of micro fuel elements are presented.
机译：本文介绍了在使用微球形燃料元件作为核燃料的情况下，对KLT-40S反应堆燃料组件（FA）的流体动力学和温度场进行数值研究的结果。模拟的FA具有与现有的包含燃料棒的FA相同的总体尺寸，因此可以将其容纳在反应堆堆芯中，而无需修改反应堆设计。带有微型燃料元件（MF FA）的FA的特殊功能是需要建立通过微型燃料元件床的冷却剂径向流，这是通过使用分配和收集集管实现的。使用ANSYS Fluent计算机代码进行了数值模拟。代码中实现的数学模型已经过完善，并根据作者在模型实验装置上获得的实验数据进行了验证，该实验装置的设计与所考虑的含微量燃料元素的FA相似。通过卵石床的冷却剂径向流布置在模型安装中。比较了在冷却剂质量速度质量的不同值下估算的床内压力损失和温度分布的数值和实验数据。提出了一种用于KLT-40S反应堆的包含微燃料元素的FA的设计。已经发现，可以用比文献中提到的更高的射孔参数（横截面系数）来设置几乎完全径向的冷却剂径向流动。证明了这种燃料组件的可维修性。获得温度，过压，冷却剂速度和电流线的分布。给出了限制微型燃料元件床身的护套的穿孔参数。

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