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首页> 外文会议>International conference on nuclear engineering >DEVELOPMENT OF A MULTI-DIMENSIONAL MEASUREMENT SENSOR OF VOID FRACTION AND PHASIC VELOCITY FOR BOILING TWO-PHASE FLOW IN A 5×5 HEATED ROD BUNDLE
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DEVELOPMENT OF A MULTI-DIMENSIONAL MEASUREMENT SENSOR OF VOID FRACTION AND PHASIC VELOCITY FOR BOILING TWO-PHASE FLOW IN A 5×5 HEATED ROD BUNDLE

机译：5×5加热棒束中沸腾两相流空分率和基本速度的多维测量传感器的研制

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A subchannel void sensor (SCVS) was developed to measure the cross-sectional distribution of a void fraction in a 5×5 heated rod bundle with o.d. 10 mm and heated length 2000 mm, and applied in a boiling two-phase flow experiment under the atmospheric conditions assumed in an accident and spent fuel pool. The SCVS comprises 6-wire by 6-wire and 5-rod by 5-rod electrodes. Wire electrodes 0.2 mm in diameter are arranged in latticed patterns between the rod bundle, while a conductance value in a region near one wire and another gives a local void fraction in the central-subchannel region. 32 points (= 6×6-4) of the local void fraction can be obtained as a cross-sectional distribution. In addition, a local void fraction near the rod surface can be estimated by a conductance value in a region near one wire and one rod using the simulated fuel rods as rod electrodes, which allows 100 additional points (=4×25) of the local void fraction to be acquired. The devised sensors are installed at five height levels to acquire two-phase flow dynamics in an axial direction. A pair of SCVS is mounted at each level and placed 30 mm apart to estimate the one-dimensional phasic velocity distribution based on the cross-correlation analysis of both layers. The time resolution of void measurement exceeds 800 frames (cross-sections) per second. The heated rod bundle has an axially and radially uniform power profile, and eight pairs of sheath thermocouples are embedded on the heated rod to monitor its surface temperature distribution. The boiling two-phase flow experiment, which simulated a boil-off process, was conducted with the devised SCVS and experimental data was acquired under various experimental conditions, such as inlet-flow velocity, rod-bundle power and inlet subcooling. The experimental results exhibited axial and radial distribution of two-phase flow structures, i.e. void-fraction and phasic-velocity distributions quantitatively.
机译：开发了一个子通道空隙传感器（SCVS），以测量5×5加热棒束中空隙分数的横截面分布，外径为d。 10毫米，加热长度为2000毫米，并在事故和乏燃料池假定的大气条件下用于沸腾两相流实验。 SCVS包括6线乘6线和5杆乘5杆的电极。直径为0.2 mm的线状电极以格子状排列在棒束之间，而一根导线和另一根导线附近的区域中的电导率值在中央子通道区域中产生局部空隙率。可获得32点（＝ 6×6-4）的局部空隙率作为截面分布。另外，可以通过使用模拟燃料棒作为棒状电极，通过一根导线和一根棒附近的区域中的电导值来估算棒表面附近的局部空隙率，从而允许局部增加100个点（= 4×25）要获取的空隙分数。设计的传感器安装在五个高度级别上，以获取轴向上的两相流动力学。一对SCVS安装在每个高度上，并且相距30 mm，以基于两层的互相关分析来估计一维相速度分布。空隙测量的时间分辨率超过每秒800帧（横截面）。加热棒束具有轴向和径向均匀的功率分布，并且在加热棒上嵌入八对护套热电偶以监视其表面温度分布。利用所设计的SCVS进行了模拟沸腾过程的沸腾两相流实验，并在不同的实验条件下获得了实验数据，例如入口流速，棒束功率和入口过冷。实验结果显示出两相流结构的轴向和径向分布，即定量的空隙率和相速度分布。

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