{"title":"研究 5 × 5 杆束中两种不同混合叶栅的横流特性","authors":"Li Jiang, Jianqiang Shan, Shan Zhou, Yixiang Zou, Junliang Guo, Miao Gui","doi":"10.1016/j.anucene.2024.110934","DOIUrl":null,"url":null,"abstract":"<div><div>To comprehend the combined mixing effects downstream two different MVGs installed at same axial height, individual analysis of these MVGs is the precondition. In this paper, an experimental study on the crossflow distribution downstream two different split-type MVGs is presented by PIV in a 5 × 5 rod bundle. The cross flow in the sixteen inner subchannels is obtained at elevation from 1.8 <em>D<sub>h</sub></em> to 25 <em>D<sub>h</sub></em> downstream grids. For both two types of grids, two individual co-rotating vortices are observed near the grid in each subchannel and inter-subchannel cross flow increases before approximate 3 <em>D<sub>h</sub></em> and decays exponentially. The secondary-flow and cross-flow intensity of grid type Ⅰ overweigh the type Ⅱ and the intensities are corelated to horizontal projected area of vane. Based on the experimental results, an improved subchannel mixing grid model is proposed and the predicted cross flow in the gap is in good agreement with measured results.</div></div>","PeriodicalId":8006,"journal":{"name":"Annals of Nuclear Energy","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Investigation on cross-flow characteristics of two different mixing vane grid in a 5 × 5 rod bundle\",\"authors\":\"Li Jiang, Jianqiang Shan, Shan Zhou, Yixiang Zou, Junliang Guo, Miao Gui\",\"doi\":\"10.1016/j.anucene.2024.110934\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>To comprehend the combined mixing effects downstream two different MVGs installed at same axial height, individual analysis of these MVGs is the precondition. In this paper, an experimental study on the crossflow distribution downstream two different split-type MVGs is presented by PIV in a 5 × 5 rod bundle. The cross flow in the sixteen inner subchannels is obtained at elevation from 1.8 <em>D<sub>h</sub></em> to 25 <em>D<sub>h</sub></em> downstream grids. For both two types of grids, two individual co-rotating vortices are observed near the grid in each subchannel and inter-subchannel cross flow increases before approximate 3 <em>D<sub>h</sub></em> and decays exponentially. The secondary-flow and cross-flow intensity of grid type Ⅰ overweigh the type Ⅱ and the intensities are corelated to horizontal projected area of vane. Based on the experimental results, an improved subchannel mixing grid model is proposed and the predicted cross flow in the gap is in good agreement with measured results.</div></div>\",\"PeriodicalId\":8006,\"journal\":{\"name\":\"Annals of Nuclear Energy\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2024-09-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Annals of Nuclear Energy\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0306454924005978\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"NUCLEAR SCIENCE & TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Annals of Nuclear Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0306454924005978","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
Investigation on cross-flow characteristics of two different mixing vane grid in a 5 × 5 rod bundle
To comprehend the combined mixing effects downstream two different MVGs installed at same axial height, individual analysis of these MVGs is the precondition. In this paper, an experimental study on the crossflow distribution downstream two different split-type MVGs is presented by PIV in a 5 × 5 rod bundle. The cross flow in the sixteen inner subchannels is obtained at elevation from 1.8 Dh to 25 Dh downstream grids. For both two types of grids, two individual co-rotating vortices are observed near the grid in each subchannel and inter-subchannel cross flow increases before approximate 3 Dh and decays exponentially. The secondary-flow and cross-flow intensity of grid type Ⅰ overweigh the type Ⅱ and the intensities are corelated to horizontal projected area of vane. Based on the experimental results, an improved subchannel mixing grid model is proposed and the predicted cross flow in the gap is in good agreement with measured results.
期刊介绍：
Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.
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