Research on Distribution Characteristics of Time-averaged Flow Field Downstream of Spacer Grid under Pulsating Flow
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摘要: 研究流量波动下棒束通道内定位格架下游瞬时流场演变特性对于揭示海洋条件下燃料组件内流动换热机理具有重要意义。本文应用粒子图像测速（PIV）技术获得了脉动流下棒束通道内定位格架下游时空演变流场结构，分析了脉动参数（脉动周期和脉动振幅）对定位格架下游速度分布和湍流特性的影响。结果表明，脉动流下定位格架下游时均速度与定常流动下时均速度差异较小，且基本不随脉动振幅和脉动周期变化而变化；脉动流下的定位格架下游横向速度和轴向速度均方根与定常流动下的速度均方根存在明显差异，且随脉动参数变化呈现出不同的变化趋势。本文研究结果有助于揭示燃料组件在非稳态条件下瞬态特性，并为燃料组件的设计和优化奠定基础。
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关键词:
- 粒子图像测速（PIV） /
- 定位格架 /
- 脉动流 /
- 速度分布 /
- 湍流特性
Abstract: Studying the evolution characteristics of the instantaneous flow field downstream of the spacer grid in the rod bundle channel under flow fluctuation is of great significance to reveal the flow and heat transfer mechanism in the fuel assembly under ocean conditions. In this paper, the structure of the spatio-temporal evolution flow field downstream of the spacer grid in the rod bundle channel under pulsating flow is obtained by using the particle image velocimetry (PIV) technique, and the effects of pulsating parameters (pulsating period and pulsating amplitude) on the velocity distribution and turbulence characteristics downstream of the spacer grid are analyzed. The results show that there is little difference between the time-averaged velocity downstream of the spacer grid under pulsating flow and that under steady flow, and it basically does not change with the variation of pulsating amplitude and pulsating period; The root mean square of transverse velocity and axial velocity downstream of the spacer grid under pulsating flow are significantly different from that under steady flow, and show different trends with the change of pulsating parameters. The results of this paper help to reveal the transient characteristics of fuel assemblies under unsteady conditions and lay a foundation for the design and optimization of fuel assemblies.-
Key words:
- PIV /
- Spacer grid /
- Pulsating flow /
- Velocity distribution /
- Turbulence characteristics
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图 2 脉动参数对定位格架下游速度分布影响
图中灰色部分位置对应图1中棒束位置；下同
Figure 2. Effect of Pulsating Parameters on Velocity Distribution Downstream of Spacer Grid
图 3 脉动参数对定位格架下游速度均方根影响
Figure 3. Effect of Pulsating Parameters on RMS of Velocity Downstream of Spacer Grid
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