Research on Cooperative Design of Anti-Hangup and Thermal Performance of Spacer Grid
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摘要: 定位格架是燃料组件骨架结构的重要组成部分，其主要功能是夹持定位燃料棒，同时还应考虑防勾挂性能和热工性能。本文从主流燃料组件的运行经验反馈出发，利用三维建模软件UG模拟格架相对运动的方法，对产生勾挂的原因进行分析，明确了外条带导向翼采用连续排列能有效提高防勾挂性能，并通过定位格架勾挂试验进行了验证；通过对定位格架所在边栅元内的计算流体力学（CFD）模拟分析，发现基于传统防勾挂设计的导向翼连续排列形式不利于相邻格架之间的热工性能；在此基础上，设计了导向翼高矮交替排列的方案。理论分析和试验验证结果表明，该方案实现了燃料组件定位格架防勾挂与热工性能的协同设计。Abstract: Spacer grid is an important part of the fuel assembly skeleton structure, whose main function is to clamp and locate the fuel rods. The anti-hangup performance and thermal performance also shall be considered. Based on the feedback of the operation experience of the mainstream fuel assembly, this paper uses the three-dimensional modeling software (UG) to simulate the relative motion of the grid, analyzes the causes of the hangup, and makes it clear that the continuous arrangement of the outer strip guide vane can effectively improve the anti-hangup performance, which is verified by the spacer grid hangup test; Through the computational fluid dynamics (CFD) simulation analysis of the side cell where the spacer grid is located, it is found that the continuous arrangement of guide vanes based on the traditional anti-hangup design is not conducive to the thermal performance between adjacent grids; On this basis, a scheme of alternating-height arrangement of guide vanes is designed. Theoretical analysis and experimental verification results show that the scheme realizes the cooperative design of anti-hangup and thermal performance of the fuel assembly spacer grid.
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Key words:
- Spacer grid /
- Hangup /
- Thermal /
- Cooperative /
- Guide vane
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图 1 定位格架边栅元及相邻格架之间结构示意图
Figure 1. Schematic Diagram of the Structure between the Side Cell of the Spacer Grid and the Adjacent Grid
图 4 导向翼间隔排列的流场和温场
Figure 4. Flow Field and Temperature Field of Guide Vanes with Spaced Arrangement
图 5 导向翼连续排列的流场和温场
Figure 5. Flow Field and Temperature Field of Guide Vanes with Continuous Arrangement
图 6 外条带导向翼高矮交替排列示意
Figure 6. Schematic Diagram of Outer Strap Guide Vanes with Alternating-height Arrangement
图 8 竖向力与竖向位移关系
Figure 8. Relationship between Vertical Force and Vertical Displacement
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