蒸汽射流凝结换热系数计算的一种新方法

A New Method to Calculate Steam Jet Condensation Heat Transfer Coefficient

基于蒸汽射流凝结的分析模型和压力振荡主频的计算公式,提出通过汽羽穿透长度将平均凝结换热系数和压力振荡主频联系起来,得到一种新的平均凝结换热系数的计算方法。通过实验得到不同蒸汽质量流率和水温下的压力振荡主频,根据本实验得到的主频和先前学者的实验值计算得到的平均凝结换热系数在1.71~2.93 MW/m^2·℃之间,换热系数出现了随着蒸汽质量流率的增大变化很小,随水温的增大略有增大而后减小的趋势。

A new method was provided to calculate the heat transfer coefficient of steam jet condensation in water by combining the average heat transfer coefficient and pressure oscillation main frequency through penetration length of stem plume, based on previous analysis model of steam jet condensation and oscillation main frequency correlation. Moreover, the pressure oscillation main frequencies were obtained experimentally at different steam mass fluxes and water temperatures, and the present and previous data were used to calculate the average heat transfer coefficients, and the values were within 1.71--2.93 MW/m2℃. The results indicated that the heat transfer coefficients were almost constant at various steam mass fluxes, and increased firstly and then decreased with the water temperatures.