Investigation on Flow Field Characteristics of Rod Bundle Channel under Rolling Condition
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摘要: 由于海洋条件下反应堆处于非稳态工况，会产生倾斜、摇摆、起伏等运动，这些运动将会在棒束通道中引入额外的惯性力场，对棒束通道中的流场会有额外的影响，因此有必要对摇摆条件下的棒束通道进行研究。本文基于粒子图像测速（PIV）技术开展了摇摆条件下节径比为1.326的棒束通道内流场分布特性研究。对比了相同流量条件下稳态工况与瞬态工况下流场分布差异，分析了同一加速度时棒束通道内不同位置的流场分布特征。实验结果表明：摇摆运动对棒束通道中部的影响较小，对通道两侧的影响较大。通道两侧的速度场呈现周期性波动，波形为反相。在流量较低的情况下会出现倒流现象，但定位格架此时对上游并未造成横向速度影响。研究表明摇摆运动引起的流场变化与脉动流引起的流场变化有较大差异，其中脉动流造成的速度场变化是均匀脉动的，而摇摆引起的速度场是在通道两侧呈现反相波动。
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关键词:
- 棒束通道 /
- 摇摆条件 /
- 粒子图像测速（PIV） /
- 定位格架
Abstract: The reactor is in an unsteady state under ocean conditions, which will cause tilt, swing, undulation and other motions of the reactor. These motions will introduce additional inertial force fields in the rod bundle channel, bringing additional influence on the flow field in the rod bundle channel. Therefore, it is necessary to study the rod bundle channel under rolling conditions. In this paper, based on the particle image velocimetry (PIV) technology, the research on the flow field distribution characteristics of the rod bundle channel with a pitch-to-diameter ratio of 1.326 under rolling condition is carried out. The difference of flow field distribution between steady state and transient state under the same flow rate is compared, and the flow field distribution characteristics at different positions in the rod bundle channel under the same acceleration are analyzed. The experimental results show that the rolling motion has a small effect on the middle of the rod bundle channel, and has a greater impact on both sides of the channel. The velocity field on both sides of the channel fluctuates periodically, with an anti-phase wave. In the case of low flow, reverse flow phenomenon will occur, but the spacer grid has no effect on the lateral speed upstream. Studies have shown that the flow field change caused by rolling motion is quite different from that caused by pulsating flow, in which the velocity field change caused by pulsating flow is uniform and pulsating, while the velocity field caused by rolling presents anti-phase fluctuation on both sides of the channel.-
Key words:
- Rod bundle /
- Rolling condition /
- PIV /
- Spacer grid
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图 2 棒束通道及测量区域 mm
P—激光穿过的平面；L1~L11—数据处理中取得速度的位置
Figure 2. Rod Bundle Channel and Measuring Area
图 4 摇摆角度示意图
AB—实验段；L—实验段长度；R—实验段到摇摆轴半径；r—摇摆运动半径；V—流体速度；g—重力加速度
Figure 4. Rolling Angle Diagram
图 5 摇摆条件下L1点流速随时间波动曲线
Figure 5. Velocity Curve with Time at L1 Point under Rolling Condition
图 6 摇摆运动下t0时刻棒束通道的速度分布
Figure 6. Velocity Distribution in Rod Bundle Channel under Rolling Motion at t0
图 7 摇摆运动下棒束通道的速度分布
Figure 7. Velocity Distribution in Rod Bundle Channel under Rolling Motion
图 8 摇摆条件下棒束通道的速度波动曲线
Figure 8. Velocity Fluctuation Curve of Rod-Bundle Channel under Rolling Condition
图 9 摇摆条件下棒束通道的速度波动曲线
Figure 9. Velocity Fluctuation Curve of Rod-Bundle Channel under Rolling Condition
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