下降管带汽导致循环回路的运动压头降低和下降管流阻的增加,也就是有效压头的增加,因而会影响到水循环特性,但影响程度则取决于带汽量的多少。为了使我国的《水力计算方法》更符合实际情况,我所承担了关于大直径下降管带汽率ψ_(xf)的测定工作。我们是通过测量下降管流速、压差和介质温度来推算截面带汽率ψ_(xj)的,对压差的测量方法作了改进,使传压管由下降管中引 Decreasing the tube entrainment leads to a decrease in the head pressure of the circulation circuit and an increase in the flow resistance of the descending tube, which is an increase in the effective pressure head, thus affecting the water cycle characteristics, but the degree of influence depends on the amount of vapor content. In order to make our country’s “hydraulic calculation method” more in line with the actual situation, I undertake the determination of the large diameter pipe down vapor ψ_ (xf). We measured the downcomer flow rate, pressure and temperature of the medium to calculate the section with the gas rate ψ_ (xj), the differential pressure measurement methods have been improved, so that the transfer tube from the drop tube