Two-group phase distribution characteristics for air-water flow in 5 × 5 vertical rod bundle channel with mixing vane spacer grids
Two-group phase distribution characteristics for air-water flow in 5 × 5 vertical rod bundle channel with mixing vane spacer grids
复制标题
DOI：
10.1016/j.ijheatmasstransfer.2021.121444
复制
发表时间：
2021-09
影响因子：
5.2
通讯作者：
Quanyao Ren;L. Pan;Zeng Pu;Fawen Zhu;Hui He
中科院分区：
文献类型：
--
作者：
Quanyao Ren;L. Pan;Zeng Pu;Fawen Zhu;Hui He
棒束通道内的相分布与传热系数、流动阻力和临界热通量有关，对于核反应堆和蒸汽发生器的设计和安全运行具有重要意义。为了明确混合叶片间隔栅格（MVSG）对杆束通道内两组气水两相流的影响，采用MVSG在5×5杆束上进行绝热向上气水两相流实验，并利用小型四传感器电导探头（MFSCP）获取详细的局部两相流参数。报告了一些有趣的现象：I 组和 II 组空隙率分布显示出核心峰特征；在当前流动条件下，两组空气-水流的I组空隙率几乎停留在0.2至0.3的区域； MVSG耗散长度大于32.1L/Dat电流两组流量工况；根据当前流动条件，随着流动的发展，MVSG的影响区域沿轴向被划分为至少三个区域。
The phase distribution in rod bundle channel was associated with the heat transfer coefficient, flow resistance and critical heat flux, which was of great significance for the design and safe operation of nuclear reactor and steam generator. In order to clarify the phase distribution characteristics and reveal the effect of mixing vane spacer grid (MVSG) in two-group air-water flow in rod bundle channel, the adiabatic upward air-water two-phase flow experiments were conducted in 5 × 5 rod bundles with MVSGs and the detailed local two-phase flow parameters were acquired with miniaturized four-sensor conductivity probe (MFSCP). Some interesting phenomena were reported: Group I and II void fraction profiles showed the core-peak features; Group I void fraction almost stayed at the region from 0.2 to 0.3 for two-group air-water flow at current flow conditions; the dissipation length of MVSG was larger than 32.1L/Dat current two-group flow conditions; and the influencing region of MVSG was divided into at least three regions along the axial direction with the flow development for current flow conditions.