垂直上升内螺纹管中高压汽？菜？两相流截面含汽率的测量
Measurement of Void Fraction of High Pressure Steam Water Two？？Phase Flow in Vertical Upward Ribbed Tube

利用四头内螺纹管构建了水平绝热管和垂直绝热管组合元件,在压力为11？？3、14？？2、21？？5 MPa,质量流速为250～1 200 kg/(m2？s),热负荷为50～300 kW/m2的范围内,采用压差替代法对内螺纹管内垂直上升流动的高温、高压汽？菜？两相流进行了截面含汽率的测量,并分析了系统参数对截面含汽率的影响。与经典公式的计算结果对比发现,Zivi模型和我国电站锅炉水动力计算标准与试验数据相差较小,其中Zivi模型与文中试验数据误差小于15%。基于试验数据,分压力拟合了体积含汽率经验公式,与试验值相比绝大部分点的相对误差小于15%,在高干度区相对误差小于10%。研究结果表明,基于压差替代法,采用所提模型可以对垂直内螺纹管内高温、高压汽-水两相流体参数进行有效测量。
The void fraction of high？？pressure and high？？temperature two？？phase flow was measured using differential pressure substitute method under the conditions that the pressures are 11？？3, 14？？2 and 21？？5 MPa, the mass velocity ranges from 250 to 1 200 kg/(m2？s), and the heat flux is from 50 to 300 kW/m2. The comparison between experimental data and results of several classical models was conducted. The experimental data agreed with the Zivi model and the model of China’s national standards for hydrodynamic calculation of power station boiler. The relative error between Zivi model and the experimental data is less than 15% and even less than 10% in high quality region. It can be concluded that the method of differential pressure substitute is suitable for the parameter measurement of high？？pressure two？？phase flow with high temperature in the vertical ribbed tube