A. S. Nikulin, S. A. Tokarev, V. I. Melikhov, O. I. Melikhov
{"title":"Investigation of a Two-Phase Flow Near a Submerged Perforated Sheet","authors":"A. S. Nikulin, S. A. Tokarev, V. I. Melikhov, O. I. Melikhov","doi":"10.1134/S0040601525700107","DOIUrl":null,"url":null,"abstract":"<p>One of the main components of a nuclear power plant with a water-moderated water-cooled power reactor (VVER) is a horizontal steam generator (SG), whose main service is to generate the specified amount of saturated steam, which then enters the turbine. The steam wetness at the SG outlet should not exceed the maximum allowable value so that the elevated moisture content would not lead to erosive wear of the turbine blades. To maintain the required wetness, horizontal steam generators are equipped with a gravity separation system, whose essential component is a submerged perforated sheet (SPS) designed for equalizing the steam load on the evaporation surface. Elaboration of a mathematical model of the gravity separation requires theoretical and practical knowledge about the processes of water droplet formation on the evaporation surface under the dynamic impact of the steam flow. These processes depend crucially on the SPS design. This work included a study of the features of a two-phase flow near a perforated sheet, which was conducted at the Barboter experimental facility, and a numerical simulation of this process using the OpenFOAM code. The experimental facility was a water-filled vessel with transparent walls. Air was supplied into the vessel from the bottom, and an SPS with side flanges was installed in the middle of the vessel. An experiment was carried with a total air flowrate of 30 dm<sup>3</sup>/min giving a velocity of 0.94 m/s in the perforated sheet holes. Processing of photo and video records of the process yield dimensions of air bubbles moving out of the perforated sheet, the frequency of their formation, and sizes of water droplets and jets at the interface. The OpenFOAM code was used for the numerical study of air discharge through one hole of the perforated sheet with subsequent formation of water jets and droplets at the interface. The predictions demonstrate a good qualitative and quantitative agreement with the experimental values of the main parameters.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"72 5","pages":"394 - 404"},"PeriodicalIF":0.9000,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermal Engineering","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S0040601525700107","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
One of the main components of a nuclear power plant with a water-moderated water-cooled power reactor (VVER) is a horizontal steam generator (SG), whose main service is to generate the specified amount of saturated steam, which then enters the turbine. The steam wetness at the SG outlet should not exceed the maximum allowable value so that the elevated moisture content would not lead to erosive wear of the turbine blades. To maintain the required wetness, horizontal steam generators are equipped with a gravity separation system, whose essential component is a submerged perforated sheet (SPS) designed for equalizing the steam load on the evaporation surface. Elaboration of a mathematical model of the gravity separation requires theoretical and practical knowledge about the processes of water droplet formation on the evaporation surface under the dynamic impact of the steam flow. These processes depend crucially on the SPS design. This work included a study of the features of a two-phase flow near a perforated sheet, which was conducted at the Barboter experimental facility, and a numerical simulation of this process using the OpenFOAM code. The experimental facility was a water-filled vessel with transparent walls. Air was supplied into the vessel from the bottom, and an SPS with side flanges was installed in the middle of the vessel. An experiment was carried with a total air flowrate of 30 dm3/min giving a velocity of 0.94 m/s in the perforated sheet holes. Processing of photo and video records of the process yield dimensions of air bubbles moving out of the perforated sheet, the frequency of their formation, and sizes of water droplets and jets at the interface. The OpenFOAM code was used for the numerical study of air discharge through one hole of the perforated sheet with subsequent formation of water jets and droplets at the interface. The predictions demonstrate a good qualitative and quantitative agreement with the experimental values of the main parameters.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
