Experimental Study of Flow Field and Turbulence in Rod Bundle Channel under Pulsating Flow Using PIV

被引：0
作者：
Qi P. [1 ]
Hao S. [1 ]
Su J. [2 ]
Qiu F. [1 ]
Tan S. [1 ]
机构：
[1] Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin
[2] The Support Center of China Atomic Energy Agency, Beijing
来源：
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | 2021年 / 55卷 / 01期
关键词：
Flow field; PIV; Pulsating flow; Rod bundle channel; Spacer grid; Turbulence;
D O I：
10.7538/yzk.2020.youxian.0088
中图分类号：
学科分类号：
摘要：
The flow rate of the primary coolant in a nuclear reactor will fluctuate during accident conditions or in floating reactors that are influenced by inertial forces in the ocean. These fluctuations may have a substantial impact on the heat transfer by the primary coolant of the reactor. In this study, combined with phase-locked PIV technology and matching index refractive (MIR) technology, the instantaneous velocity in the rod bundle channel with and without spacer grid was measured under the pulsating flow. In addition, the phase averaged velocity and RMS component distribution of different phases were analyzed. The experimental results demonstrate that for the bare rod bundle the acceleration increases the fluid velocity near the channel wall. And RMS decreases as the fluid accelerates and increases as the flow rate decelerates. For pulsation flow driven by axial pressure gradient, the u' lags behind the v', and both of them lag behind the change of flow rate. The strong mixing effect on the spacer grid with mixing vane greatly reduces the influence of fluid acceleration on the velocity distribution and turbulence intensity in the rod bundle channel. The experimental results are helpful to understand the mechanism of pulsating flow in the rod bundle channel more clearly. © 2021, Editorial Board of Atomic Energy Science and Technology. All right reserved.
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页码：142 / 150
页数：8
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