2023年第1期总第251期低温工程CRYOGENICSNo.12023SumNo.251超临界氮气在规则球床堆中的流动与传热特性分析陈煜尧1,2程帅3童念雪3陈亚春1,2魏健健1,2张德志3金滔1,2(1浙江大学制冷与低温研究所杭州310027)(2浙江省制冷与低温技术重点实验室杭州310027)(3西北核技术研究所西安710024)摘要:采用计算流体力学方法模拟高温高压工况下规则球床堆内超临界氮的流动与传热特性,系统分析了入口流量、填充颗粒直径、堆积床高径比对流动和传热性能的影响规律。结果表明:堆积床内相邻颗粒层间存在流动滞止区,该区域流体温度高于其它低阻力区域。随着液氮入口流量和堆积床高径比的增大以及填充颗粒直径的缩小,气体流动阻力逐渐升高,气体与堆芯的换热更加充分,进而出口氮气温度变高。关键词:规则堆积床超临界氮气换热性能数值模拟中图分类号:TB663文献标识码:A文章编号:1000-6516(2023)01-0037-06收稿日期:2022-10-26;修订日期:2023-02-09作者简介:陈煜尧,男,24岁,硕士研究生。通讯作者:魏健健,男,34岁,副教授,SimulationandanalysisofsupercriticalN2flowandheattransferinaregularsphericalpebblebedChenYuyao1,2ChenShuai3TongNianxue3ChenYachun1,2WeiJianjian1,2ZhangDezhi3JinTao1,2(1InstituteofRefrigerationandCryogenics,ZhejiangUniversity,Hangzhou310027,China)(2KeyLaboratoryofRefrigerationandCryogenicTechnologyofZhejiangProvince,Hangzhou310027,China)(3NorthwestInstituteofNuclearTechnology,Xi’an710024,China)Abstract:Apebble-bed-typehigh-temperatureandpressuregaspreparationsystembyliquidnitrogenreheatinginvolvesheattransferbetweenliquidnitrogenandpebblebedcore.Itissignifi-canttostudytheflowandheattransfercharacteristicsofsupercriticalnitrogeninthepebblebedunderhighpressureforitsdesign,operationandsafetyanalysis.Computationalfluiddynamicsisusedtosimulatetheflowandheattransferofsupercriticalnitrogeninaregularlyarrangedpebblebedunderhightemperatureandpressure.Theeffectsoftheinletflow,particlediameter,andheight-to-diameterratioofthepebblebedontheflowandheattransferperformanceareanalyzed.Theresultsshowaflowstagnationregionbetweenadjacentparticlelayersinthepebblebed,andthefluidtemperatureinthisregionishigherthaninotherlow-resistanceregions.Meanwhile,withtheincreaseofth...
