环形窄缝通道内流动沸腾干涸点的研究  

Experimental Research on Dryout Point of Flow Boiling in Narrow Annular Channel

作　　者：吴鸽平[1] 吴埃敏[1] 郭贇[1] 秋穗正[1] 卢东华[2] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]中国核动力研究设计院反应堆工程研究所,成都610041

出　　处：《西安交通大学学报》2004年第7期686-689,697,共5页Journal of Xi'an Jiaotong University

基　　金：空泡物理与自然循环国家级重点实验室基金资助项目 (98JS86 8 1JW0 80 2 );国家自然科学基金会优秀重点实验室建设基金资助项目 .

摘　　要：在间隙为1 05mm和1 55mm的垂直环形窄缝通道内,以去离子水为工质,对内、外管通电加热,进行了环形窄缝通道内干涸点的实验研究.实验压力范围主要为2～4MPa,质量流速为40～80kg·m-2·s-1.由内、外管热流密度的比值得到了出现干涸点的判据.实验中还研究了压力、质量流速和进口条件对干涸点处含汽率的影响.实验表明,当对外管单面加热时,发现质量流速增大,临界含汽率减小;当进口含汽率增大时,临界含汽率增大;在相同的情况下,外管出现干涸时的截面含汽率大于内管出现干涸时的截面含汽率.根据实验数据对原苏联古塔杰拉奇圆管的干涸点公式进行了修正,得到了适合于计算环形管道干涸点的经验关系式.An experimental research on the dryout point of flow boiling in narrow annular channels with 1.55 mm and 1.05 mm annular gap respectively, are conducted. Distilled water is used as the work fluid, the range of pressure is limited within 2.0-4.0 MPa and that of mass flux is 40-80 kg/(m2&middots). The appearance of dryout point can be judged according to the ratio of qo/qi. The relation of critical qualities with mass flux and pressure is revealed. It is found that the critical qualities decrease with the increase of mass flux and increase with the increase of inlet qualities in externally heated annuli. Under the same conditions critical qualities in outer tube are always larger than that in inner tube. The traditional equation for tubes is modified, and an empirical equation of dryout point for narrow annuli is provided.

关 键 词：环形窄缝 流动沸腾 干涸点 

分 类 号：TK214[动力工程及工程热物理—动力机械及工程]