Frequency analysis and amplitude characteristics of pressure oscillation for steam jet

Experimental investigation on pressure oscillation characteristics for steam jet have been performed in steam mass flux 298-865 kg·m^-2·s^-1, water temperature 20-70°C. The dominant frequency agreed with the periodic ballooning and contraction of steam plume. The dominant frequency first increased and then decreased with the increasing water temperature for the condensation region transforming from condensation oscillation region to stable condensation region. The dominant frequency decreased with the increasing water temperature. The variation of dominant frequency was opposite to that of amplitude. Based on the experimental data and analysis, a correlation was given to predict the dimensionless root mean square amplitude. The prediction error was within ±30% in steam mass flux 370-865 kg·m^-2·s^-1, water temperature 20-60°C.