• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Energy Conversion & Management >Enhancement of heat transfer in a typical pressurized water reactor by different mixing vanes on spacer grids
【24h】

Enhancement of heat transfer in a typical pressurized water reactor by different mixing vanes on spacer grids

机译：通过间隔栅上的不同混合叶片来增强典型压水反应堆中的传热

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The flow mixing devices on a grid spacer are designed to enhance the turbulence and heat transfer in sub-channels. The present study evaluates the effects of different mixing vane configurations on flow pattern and heat transfer in the downstream of the mixing vanes in the sub-channels of fuel assembly. This is done by obtaining velocity and pressure fields, turbulent intensity and the heat transfer coefficient using a three-dimensional CFD analysis. Two blade groups, two-dimensional and three-dimensional, were modeled. The two-dimensional blades are classified in ring type, diamond type, square type, homographic type and multiply type. Three-dimensional blades containing split vane, ripped open, trumpet shaped and split trumpet shaped are applied in a 2 × 2 rod bundle array. Also, a 3 × 3 rod bundle array is modeled to evaluate the neighborhood effects on the thermo-hydraulic parameters. The latter model shows a good comparison with the available experimental data by 5-12% difference. A standard K-epsilon model is used as a turbulence model and the symmetry condition is set as boundary conditions. It was confirmed that the turbulence in the sub-channel was significantly promoted by spacer and mixing devices. However, their effects rapidly decreased to a fully developed level after passing approximately 10 times the hydraulic diameter downstream of the spacer. The CFD results showed good agreement with the measurements. The static pressure of the fluid in the flow direction drops rapidly, then in a very short distance rise up, followed by a decrease near to the linear slope down stream. The split trumpet vane was the best with a 14% increase in the heat transfer coefficient, however regarding the manufacturing possibilities, the split vane spacers are expected to significantly enhance the overall heat transfer of a nuclear fuel assembly about 9.82% with a reasonable increase in the pumping cost.
机译：隔栅上的混流装置设计用于增强子通道中的湍流和热传递。本研究评估了不同混合叶片配置对燃料组件子通道中混合叶片下游流动模式和传热的影响。这是通过使用三维CFD分析获得速度和压力场，湍流强度和传热系数来完成的。对两个刀片组（二维和三维）进行了建模。二维叶片分为环型，菱形，方形，单应型和倍增型。包含裂片，裂开，小号形和小号形的三维叶片以2×2的棒束阵列形式应用。同样，对3×3棒束阵列进行建模，以评估对热工液压参数的邻域影响。后一种模型与现有实验数据进行了很好的比较，相差5-12％。使用标准的K-ε模型作为湍流模型，并将对称条件设置为边界条件。证实了通过间隔物和混合装置显着促进了子通道中的湍流。但是，它们的作用在经过垫片下游水力直径的约10倍后迅速降至完全发展的水平。 CFD结果与测量结果吻合良好。流体在流动方向上的静压迅速下降，然后在很短的距离内上升，然后在下游线性斜率附近下降。分离式小号叶片是最好的，其传热系数增加了14％，但是考虑到制造可能性，分离式叶片隔片预计将显着提高核燃料组件的整体传热，达到9.82％，并且合理地增加。抽水成本。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号