EFFECTS OF A SPACER ON THREE-DIMENSIONAL VOID FRACTION DISTRIBUTIONS IN GAS-LIQUID TWO-PHASE FLOW IN A BUNDLE

垫片对管束内气液两相流三维空隙率分布的影响

• 批准号: 08680526
• 负责人: TAKENAKA Nobuyuki
• 金额: $ 1.54万
• 依托单位: KOBE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08680526/
• 关键词: gas-liquid two-phase flow; three-dimensional; void fraction; bundle; spacer; neutron; radiography; visualization; スぺ-サ; ラジオグラフ; ロッドバンドル; 三次元分布; 中性子ラジオグラフィ; 画像処理; アニメーション

Fuel rods in water cooled reactors are supported by a spacer. The behaviors of the coolant inside and near the spacer are comlex and they are important from safety considerations of nuclear reactor to understand the two-phase flow around the spacer.The purpose of this research is to clarify the effects of the spacer on the steady two-phase flow in the rod bundle by measuring the three-dimensional void fraction distribution by a neutron dadiography CT method.Air-water two-phase flow experiments in a 4x4 rod bundle with circular ferrule type spacers were carried out and CT reconstructions with 0.18 mm in the spatial resolution were made. By the CT reconstructions, two handreds horizontal slices with 321x321 points along the conduit were carried out. The horizontal distributions were expressed by the brightness and the surface plot of the void fraction and animations were made to show the all slices for the three-dimensional distributions to develop the methods to understand well the three-dimensional distributions.The effects of the spacer on the void fraction distributions could be clarified by the obtained three-dimensional distributions. It was shown that the void fraction distribution was affected much by the spacer in annular flow region and the water gathered at four cornners in the spacer the effects of which remained downstream of the spacer.

水冷反应堆中的燃料棒由垫片支撑。隔板内和隔板附近冷却剂的行为是复杂的，从反应堆的安全性考虑，了解隔板周围的两相流动是非常重要的。本研究的目的是通过用中子照相CT方法测量三维含气率分布来阐明隔板对棒束内定常两相流动的影响。在CT重建的基础上，沿导管进行了两个321×321点的水平层面。水平分布用空泡率的亮度和表面图来表示，并制作动画显示三维分布的所有切片，以开发更好地理解三维分布的方法，通过所获得的三维分布可以阐明间隔物对空泡率分布的影响。结果表明，在环空流区内，隔板对空泡率分布影响较大，隔板内四个角处的水聚集在隔板的下游。

项目成果

N.Takenaka,H.Asano T.Fujii,M.Matsubayashi: "Three-dimensional Void Fraction Measurement of Steady Two-phase Flow by Newtron Radiography" NUREG report,to be published.

N.Takenaka、H.Asano T.Fujii、M.Matsubayashi：“Newtron 射线照相法稳定两相流的三维空隙率测量”NUREG 报告，即将出版。

N.Takenaka, T.Fujii, T.Wada, M.Matsubayashi, A.Tsuruno: "Three-Dimensional Void Fraction Measurement of Steady Air-Water Two-Phase Flow in a Rod-bundle by Neutron Radiography" Proc.Japan-US Seminar Two-Phase Flow Dynamics, July 1996, Fukuoka, Japan. 331-3

N.Takenaka、T.Fujii、T.Wada、M.Matsubayashi、A.Tsuruno：“通过中子射线照相法测量棒束中稳定空气-水两相流的三维空隙率”Proc.Japan-US

N.Takenaka, H.Asano, T.Fujii and M.Matsubayashi: "Three-dimensional Void Fraction Measurement of Steady Two-phase Flow by Neutron Radiography" Proc.OECD/CSNI Specialist Meeting.on Advanced Instrumentation and Measurement Technique, March, 1997, Santa Barb

N.Takenaka、H.Asano、T.Fujii 和 M.Matsubayashi：“通过中子射线照相法测量稳定两相流的三维空隙率”Proc.OECD/CSNI 高级仪器和测量技术专家会议，3 月，

N.Takenaka et al.: "Three-dimensional Void Fraction Measurement of Two-Phase Flow in a Rod Bundle by Neutron Radiography" "Ffth World Conference on Neutron Radiography",DGFZP. 118-125 (1997)

N.Takenaka 等人：“通过中子射线照相测量棒束中两相流的三维空隙率”，“第五届世界中子射线照相会议”，DGFZP。

N.Takenaka, H.Asano, T.Fujii, T.Wada and M.Matsubayashi: "Three-dimensional Void Fraction Measurement of Two-phase Flow in a Rod Bundle by Neutron Radiography" in "Fifth World Conference on Neutron Radiography", Deutsche Gesellschaft Fur Zerstrorungsfreie

N.Takenaka、H.Asano、T.Fujii、T.Wada 和 M.Matsubayashi：“中子射线照相法对棒束中两相流的三维空隙率测量”，“第五届世界中子射线照相会议”，