不稳定蒸汽射流凝结振荡实验研究

Experimental Investigation on Condensation Oscillation Characteristics of Unstable Steam Jet

对不稳定蒸汽射流凝结压力振荡现象进行了实验研究。结果表明:在不同的蒸汽质量流率和过冷水温度下蒸汽射流存在3种凝结流型,即喘振、半球形汽泡振荡和周期性汽泡振荡;压力振荡发生频率随着蒸汽质量流率的增加而增大,随着过冷水温度的升高先增大后减小,最大压力振荡发生频率出现在由喘振/半球形汽泡振荡区向周期性汽泡振荡区转变时;喘振和半球形汽泡振荡区的压力振荡幅值随蒸汽质量流率的增加而减小,周期性汽泡振荡区的压力振荡幅值随蒸汽质量流率的增加而增大;3种流型下的压力振荡幅值均随过冷水温度的升高而增大。

The pressure oscillation caused by condensation of unstable steam jet submerged in subcooled water was investigated experimentally. Results show that there are three typical flow patterns in the condensation process at different mass flow rates of steam jet and different temperatures of subcooled water, i.e. chugging(C), hemispherical bubble oscillation(HBO) and periodic bubble oscillation(PBO). The frequency of pressure oscillation increases with the rise of steam mass flow, which first increases and then decreases with rising temperature of subcooled water, and the maximum value appears in the transition area from chugging/HBO to PBO. The intensity of pressure oscillation in chugging/HBO region reduces and that in PBO region increases with the rise of steam mass flow. Moreover, the intensity of pressure oscillation increases with rising temperature of subcooled water under all the three flow patterns.