超临界二氧化碳工质管屏流量分配特性分析  

Study on Flow Distribution Characteristics of Supercritical Carbon Dioxide in A Tube Panel

作　　者：闫凯[1] 张建文[1] 乌晓江[1] YAN Kai;ZHANG Jianwen;WU Xiaojiang(Shanghai Boiler Works Co. , Ltd. , Shanghai 200245, China)

机构地区：[1]上海锅炉厂有限公司,上海200245

出　　处：《锅炉技术》2022年第2期21-27,共7页Boiler Technology

摘　　要：应用部件压力法,并结合美国国家标准与技术研究院(NIST)物性数据库分析了包括管屏几何结构、热力学参数以及动力学参数在内的多个关键因素对超临界二氧化碳流量分配特性的影响。结果表明:在相同条件下,管屏内水蒸气工质的阻力高于二氧化碳工质,而二氧化碳工质的流量偏差小于水蒸气工质条件;质量流速500 kg/(m^(2)·s)是管屏内流量分配出现正、负流量特性转换的阈值。质量流速低于该值呈正流量特性,高于该值呈负流量特性;随着管屏入口压力和入口温度的增加,管屏内工质流量偏差更趋向于平缓;随着热偏差系数和加热功率的增加,管屏内工质流量分配的负流量特性增强。By applying the Element Pressure Method,combined with the physical properties of supercritical carbon dioxide from NIST,the influences of several key factors,including panel geometry structure,thermodynamic parameters and dynamic ones,on the flow distribution characteristics of supercritical carbon dioxide were studied.The results show that under the same calculating conditions,the total pressure drop of water vapor is higher than that of supercritical carbon dioxide.However,the flow deviation of supercritical carbon dioxide is less than that of water vapor.There is a threshold value of mass velocity of 500 kg/(m^(2)·s)for the transfer between positive or negative flow characteristics.The positive flow characteristics is presented when mass velocity is lower than this threshold value.Reversely the negative flow characteristics is presented.With the increase of pressure and temperature of supercritical carbon dioxide at the inlet of tube panel,the flow deviation is less severer.With the increase of thermal deviation coefficient and heat absorption,the negative flow characteristics is enhanced.

关 键 词：二氧化碳 流量分配 流量特性 重位压降 摩擦压降 

分 类 号：TK222[动力工程及工程热物理—动力机械及工程]