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首页> 外文期刊>Journal of Heat Transfer >Large-scale Pulsation Detection By Means Of Temperature Measurements
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Large-scale Pulsation Detection By Means Of Temperature Measurements

机译：通过温度测量进行大规模脉动检测

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In the present work we explore the potential of time-resolved temperature measurements to obtain information on large-scale pulsations in a rod bundle geometry with axial flow. Large-scale flow pulsation is the phenomenon that dominates the turbulent mixing between the subchannels of rod bundles, which explains why it is of great importance for the design or assessment of nuclear fuel elements. The objective of the present work is to determine the characteristics of large-scale pulsations that can be used for the verification or validation of computational fluid dynamics code results. The method proposed is to generate a temperature gradient across the location of flow pulsations and to measure the time-varying temperature field downstream. Pulsation characteristic times, lengths, and traveling speed have been obtained. This study has been performed in a rod bundle similar to a nuclear fuel assembly and the results obtained are in good agreement with previous works on similar geometries. The technique can be applied to obtain additional large-scale structure information in test sections designed for thermal measurements, in situations where convection is dominated by these structures.
机译：在当前的工作中，我们探索了时间分辨温度测量的潜力，以获取有关带轴向流的棒束几何中大范围脉动的信息。大规模的流动脉动是支配棒束子通道之间湍流混合的现象，这解释了为什么它对于核燃料元件的设计或评估非常重要。本工作的目的是确定可用于验证或确认计算流体动力学代码结果的大规模脉动的特征。提出的方法是在整个流动脉动的位置生成温度梯度，并测量下游随时间变化的温度场。获得了脉动特征时间，长度和行进速度。这项研究是在类似于核燃料组件的棒束中进行的，所获得的结果与先前关于类似几何形状的工作非常吻合。在对流受这些结构支配的情况下，可以将该技术应用于为热测量而设计的测试部分中获取其他大规模结构信息。

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