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Study into the Distribution of Mass Velocity and Enthalpy of Single-Phase and Two-Phase Flows in the Cross Section of a 19-Rod Bundle in an Electrically Heated Model of an RBMK-1000 Fuel Assembly
Thermal Engineering Pub Date : 2020-05-25 , DOI: 10.1134/s0040601520060014
D. A. Afremov , A. V. Basov , E. A. Boltenko , M. V. Davydov , A. I. Emelyanov , I. V. Kononenko , A. V. Stolpnik

Abstract

The results of experimental studies into the distribution of mass velocity and enthalpy of single-phase and two-phase flows over the cross section of a 19-rod bundle in an electrically heated model of an RBMK-1000 fuel assembly (FA) are presented. A description is given of the experimental section, which included a 19-rod electrically heated assembly of fuel-element simulators, a system for sampling a medium from cells, and a control system for moving samplers. A bunch of fuel rod simulators consisted of a central unheated rod and 18 electrically heated rods. The heated length of the rods bundle was 3500 mm. The sampling system from characteristic cells included sharp-edge samplers, a system for moving samplers from the starting position to the working position, and a cooling system and measuring sample parameters. Samplers corresponding in shape and geometrical dimensions to five characteristic cells were made of stainless steel. Single phase and two phase samples were taken from assembly characteristic cells under the condition of isokinetics. The condition for the isokinetics of the selection was that the parameters of the coolant flow that entered the sampler remained the same as they were before the sampler was introduced into the stream. In the experiments, the achievement of the isokinetic condition was determined on the basis of the measured difference in static pressures in the cells and on the wall of the assembly housing. The results of experiments performed under isothermal and nonisothermal coolant flows in a wide range of mass velocities and enthalpies are presented. It has been shown that the distribution of the reduced mass velocity and steam quality over the bundle cells depends on the flow regimes of the coolant flow that are formed in the cells.


中文翻译:

RBMK-1000燃料组件电加热模型中19杆管束横截面中单相和两相流动的质量速度和焓的分布研究

摘要

提出了在RBMK-1000燃料组件(FA)的电加热模型中19杆管束横截面上单相和两相流的质量速度和焓分布的实验研究结果。给出了对实验部分的描述,该部分包括一个19杆电加热的燃料元素模拟器组件,一个用于从细胞中采样介质的系统以及一个用于移动采样器的控制系统。一堆燃料棒模拟器包括一个中央未加热棒和18个电加热棒。棒束的加热长度为3500mm。来自特征单元的采样系统包括锋利的采样器,将采样器从起始位置移动到工作位置的系统以及冷却系统和测量样品参数的系统。形状和几何尺寸对应于五个特征单元的采样器由不锈钢制成。在等速运动条件下,从装配特征单元中获取单相和两相样品。选择等速运动的条件是,进入采样器的冷却剂流量参数与将采样器引入流中之前的参数保持相同。在实验中,根据单元和组件外壳壁上静压力的测量差异确定是否达到等速运动状态。给出了在等温和非等温冷却剂流中各种质量速度和焓下进行的实验结果。
更新日期:2020-05-25
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