Abstract
The horizontal steam generator (SG) is one of specific features of Russian-type pressurized water reactors (VVERs). The main advantages of horizontal steam generator are connected with low steam loads on evaporation surface, simple separation scheme and high circulation ratio. The complex three-dimensional steam-water flows in the steam generator vessel influence significantly the processes of the steam separation, distribution, and deposition of the soluble and nonsoluble impurities and determine the efficiency and reliability of the steam generator operation. The 3D code for simulation of the three-dimensional steam-water flows in the steam generator could be effective tool for design and optimization of the horizontal steam generator. The results of the code calculations are determined mainly by the set of the correlations describing interaction of the steam-water mixture with the inner constructions of the SG and interfacial friction. The results obtained by 3D code STEG with the usage of the different interfacial friction correlations are presented and discussed in the paper. These results are compared with the experimental ones obtained at the experimental test facility PGV-1500 constructed for investigation of the processes in the horizontal steam generator.
Highlights
The complex three-dimensional steam-water flows in the steam generator vessel influence significantly the processes of the steam separation, distribution, and deposition of the soluble and nonsoluble impurities and determine the efficiency and reliability of the steam generator operation [1]
The computer code for reliable simulation of the three-dimensional steam-water flows in the steam generator volume with complex geometry, inner constructions, and distributed heat sources will be effective tool for design and optimization of the complex heat-exchange equipment similar to the horizontal steam generator
Several computer codes were developed for simulation of the three-dimensional thermal hydraulic processes in the complex geometries [2,3,4,5,6,7,8,9]
Summary
The complex three-dimensional steam-water flows in the steam generator vessel influence significantly the processes of the steam separation, distribution, and deposition of the soluble and nonsoluble impurities and determine the efficiency and reliability of the steam generator operation [1]. Several computer codes were developed for simulation of the three-dimensional thermal hydraulic processes in the complex geometries [2,3,4,5,6,7,8,9] These codes were based on the methods of the multifluid dynamics [10] with the assumptions that considered medium consists of the several interpenetrative and interacting fluids (in the case of the steam generator, there are two fluids: water and steam). The terms describing interfacial friction and terms describing interaction of the steam-water mixture with the inner constructions influence significantly the results of the simulation of the flows under consideration. The development, analysis, and systematization of the interfacial friction correlations were fulfilled during the development of the system thermal-hydraulic codes RELAP5, TRAC, CATHARE, and so on In this activity, several typical flow patterns of the steam-water mixture were identified (bubble flow, dispersed flow, and so on), and for each pattern, the interfacial friction correlations
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