The study presents the experimental results for inter-assembly interaction of coolant flows in the core of the VVER consisting of fuel assemblies TVSA-T and TVSA-T.mod.2. The coolant flowing in fuel assemblies (FA) was modeled on an aerodynamic stand. The studies were carried out on the model of the VVER core fragment and consisted in measuring the velocity vector modulus in the characteristic zones of both the TVSA and the inter-assembly space of the VVER core. Measurements were carried out by a five-channel pneumometric probe. The analysis of the spatial distribution of the projections of the absolute flow velocity allowed detailing the pattern of streamlining of the spacer, mixing and combined spacer grids of the TVSA by the coolant flow. Results of investigation of inter-assembly interaction of the coolant between adjacent fuel assemblies TVSA-T and TVSA-T.mod.2 were adopted for practical use in JSC “OKBM Afrikantov” to assess the thermal reliability of VVER cores and included in the database to verify the programs of computational fluid dynamics (CFD-codes) and to provide a detailed cell calculation of the VVER core.

中文翻译：

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VVER核心中的冷却剂的流体动力学特性以及与不同设计的燃料组件的混合

该研究提出了由燃料组件TVSA-T和TVSA-T.mod.2组成的VVER核心中冷却剂流的组件间相互作用的实验结果。在空气动力台架上模拟了在燃料组件（FA）中流动的冷却剂。对VVER磁心碎片的模型进行了研究，包括测量TVSA和VVER磁心的组件间空间的特征区域中的速度矢量模量。用五通道肺炎探针进行测量。对绝对流速的投影的空间分布的分析允许详细描述冷却剂流对TVSA的间隔物，TVSA的混合和组合间隔物网格的流线型模式。