...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nuclear Engineering and Design >Experimental study on hot-leg U-bend two-phase natural circulation in a loop with a large diameter pipe
【24h】

Experimental study on hot-leg U-bend two-phase natural circulation in a loop with a large diameter pipe

机译：大管径回路热腿U形弯两相自然循环实验研究

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

In relation to nuclear reactor accident and safety studies, experiments on hot-leg U-bend two-phase natural circulation in a loop with a relatively large diameter pipe (l0.2 cm inner diameter) were performed for understanding the two-phase natural circulation and flow termination during a small break loss of coolant accident in LWRs. The loop design was based on the scaling criteria developed under this program and the loop was operated either in a natural circulation mode or in a forced circulation mode using nitrogen gas and water. Various tests were carried out to establish the basic mechanism of the flow termination as well as to obtain essential information on scale effects of various parameters such as the loop frictional resistance, thermal center and pipe diameter. The void distribution in a hot-leg, flow regime and natural circulation rate were measured in detail for various conditions. The termination of the natural circulation occurred when there was insufficient hydrostatic head in the downcomer side. The superficial gas velocity at the flow termination could be predicted well by the simple model derived from a force balance between the frictional pressure drop along the loop and the hydrostatic head difference. The bubbly-to-slug flow transition was found to be dependent on axial locations. It turned out that the formation of cap bubbles in the large diameter pipe caused the increased drift velocity, which would affect the prediction of the void fraction in the hot leg.
机译：关于核反应堆事故和安全性研究，在具有较大直径管道（内径为l0.2 cm）的回路中进行了热腿U形弯头两相自然循环实验，以了解两相自然循环轻水堆中的冷却液因少量破裂损失而意外终止流动。回路设计基于在该程序下制定的缩放标准，并且回路使用氮气和水以自然循环模式或强制循环模式运行。进行了各种测试，以建立流动终止的基本机理，并获得有关各种参数（例如，环路摩擦阻力，热中心和管道直径）的比例效应的基本信息。针对各种条件，详细测量了热腿中的空隙分布，流动状态和自然循环速率。当降液管一侧的静水压头不足时，自然循环就会终止。通过简单的模型可以很好地预测流动终止处的表观气体速度，该简单模型是由沿着环路的摩擦压降与静水压头差之间的力平衡得出的。发现气泡到团状流的过渡取决于轴向位置。事实证明，在大直径管道中形成盖泡会导致漂移速度增加，这会影响对热段中空隙率的预测。

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