中文摘要：

在低质量流速下,对绝热水平布置的φ31.8 mm×6.0 mm西门子公司优化内螺纹管进行了高压汽水两相流摩擦压降特性试验研究;为进行比较,又对同规格的水平绝热光管的两相摩擦压降进行了测定。同时探讨超临界压力下优化内螺纹管摩擦压降特性。根据试验结果,得到了优化内螺纹管的两相摩擦压降倍率随压力、蒸汽干度和质量流速变化,分析超临界压力下优化内螺纹管的摩擦压降随质量流速、工质焓值和压力的变化。通过与水平光管比较发现：在高干度区,水平内螺纹管的两相摩擦压降倍率比水平光管有一明显得多的峰值存在。与亚临界压力下单相摩擦阻力系数相比,超临界压力下内螺纹管摩擦阻力系数的特点是在拟临界温度处摩擦阻力系数存在一个突跳变化,即存在一个峰值。

英文摘要：

At low mass fluxes, experimental investigation on the frictional pressure drops of high pressure steam water two-phase flows in an adiabatic horizontal Siemens AG optimized internally-ribbed tube with a diameter of φ 31.8 mm × 6.0 mm was carried out. The two-phase frictional pressure drops of an adiabatic horizontal smooth tube with a diameter of φ 31.8 mm × 6.0 mm were also measured under the same experimental conditions to provide a data base for comparison. In addition, the frictional pressure drops at supercritical pressures in the internally-ribbed tube were obtained. According to experimental data, the two-phase flow friction multiplier was calculated and its variations with the pressure, the mass flux and the steam quality were obtained. At supercritical pressures, the variations of the frictional pressure drops with the mass flux, the bulk enthalpy and the pressure were also analyzed. By comparison, it is found that the two-phase friction multiplier of the horizontal internally-ribbed tube has an obvious peak value, which is much larger than that of the horizontal smooth tube, in the region with high steam qualities. Comparing to the single-phase frictional factor at subcritical pressures, the characteristic of frictional factor at supercritical pressures is that there is a sudden change at the point of the pseudo-critical temperature, that is to say, there is a peak value.