【摘要】 以去离子水为工质,在P=1~3MPa、G=190~1050kg/(m2·s)、ΔTsub,in=20~70℃、q=304~1873kW/m2的参数范围内,研究了垂直上升、倾斜向上30°、倾斜向上60°3个不同方向下环形通道内汽-水两相流压降。环形通道当量直径为7mm,加热方式为内管单面加热。通过分析流道倾斜角度和空泡份额对两相流压降的影响,提出了倾斜上升流中两相流压降受流道倾斜影响程度的判据式。在判据式的基础上,进一步提出了倾斜上升流道内两相流压降计算修正关系式。结果表明,用修正后的压降关系式验证本实验倾斜两相流压降,预测结果令人满意。更多还原

【Abstract】 The experiment is investigated under the condition of: P=1~3 MPa, G=190~1 050 kg/(m2 · s), ΔTsat=20~70℃, q=304~1873 kW/m2 in an annular channel which is heated by a tube at its center with the co-current stream-water system. By analyzing the change of forces, a criterion for working out how pressure drop is influenced by inclination and void fraction has been developed. Based on the criterion, a modified two-phase flow pressure drop correlation for angles from vertical upward to horizontal has been developed. The result indicates that the modified correlation is fit for calculating the pressure drop of two-phase flow in the inclined channel.更多还原