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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.
In a vertical narrow annular channel with gaps of 105 mm and 115 mm, experimental studies on the dry spots in the narrow annular channel were carried out using deionized water as the working fluid and electric heating of the inner and outer tubes. The experimental pressure range was 2 ~ 4MPa, the mass flow rate is 40 ~ 80kg · m-2 · s-1.The criterion of dry-up point is obtained from the ratio of the heat flux density of the inner and outer tubes.The pressure, mass flow rate and inlet conditions The results show that when the outer tube is heated on one side, it is found that the mass flow rate increases and the critical moisture content decreases. When the steam content increases, the critical moisture content increases. In the same situation, the outer tube has a dry section when the steam content is higher than the inner section of the tube when the dry gas content.According to the experimental data of the ancient Soviet Guta Geraqi dry pipe formula was amended, got The empirical relationship that is suitable for calculating the point at which a ring pipe dries up.