滚动工况下棒束通道自然循环流动不稳定性研究

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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引用次数: 1

摘要

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

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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来源期刊

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

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