Study on Natural Circulation Flow Instabilities in Rod Bundle Channel Under Rolling Condition

Volume 3: Student Paper Competition; Thermal-Hydraulics; Verification and Validation Pub Date : 2020-08-04 DOI:10.1115/icone2020-16362

Kun Cheng, Jian Deng, R. Cai, Libo Qian, Peiyao Qi, Bingzheng Ke

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Abstract

The effects of rolling condition on the flow instability characteristics of natural circulation (NC) in rod bundle channel were experimentally studied. A 3 × 3 rod bundle channel is used as the testing section. The experimental system pressure range is 0.2 to 0.6 MPa, and the range of inlet subcooling is 10 to 70 °C. The ranges of rolling motion amplitude and period are 10 ∼ 20° and 10 ∼ 30s, respectively. Two typical two-phase flow instabilities in rod bundle channel under rolling condition were found in experiments: (a) the trough-type oscillation caused by the vapor generation at the minimum point of flow fluctuation and (b) the compound oscillation formed by the superposition of the trough-type oscillation and DWOI. Experimental results show that the rolling motion can reduce the threshold heating power of trough-type oscillation and cause the occurrence of NC flow instability in advance. But the rolling motion cannot affect the dimensionless boundary of DWOI in rod bundle channel.

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滚动工况下棒束通道自然循环流动不稳定性研究

实验研究了轧制条件对棒束通道内自然循环流动不稳定性的影响。采用3 × 3棒束通道作为试验断面。实验系统压力范围为0.2 ~ 0.6 MPa，进口过冷度范围为10 ~ 70℃。滚动运动幅度和周期范围分别为10 ~ 20°和10 ~ 30s。在实验中发现了两种典型的滚动条件下棒束通道两相流动不稳定性:(a)流动波动最小点处产生蒸汽引起的槽型振荡和(b)槽型振荡与DWOI叠加形成的复合振荡。实验结果表明，滚动运动可以降低槽型振荡的阈值加热功率，并导致数控流动不稳定的提前发生。但滚动运动不影响杆束沟道的无量纲边界。

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Volume 3: Student Paper Competition; Thermal-Hydraulics; Verification and Validation

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