Research on characteristics of pressure oscillation amplitude due to double-hole steam jet submerged in subcooled water

Multi-hole steam jet condensation in subcooled water is widely used in nuclear reactor safety system. Pressure oscillations caused by steam jet condensation during the pressure relief process can do damage the water tank and surrounding equipment. In present study, the experimental study on pressure oscillation amplitude of the steam discharged from 8mm double-hole into the subcooled water was carried out, while the water temperature ranged from 20 to 65℃ and steam mass flux ranged from 300 to 700 kg•m^-2•s^-1. In the stable condensation zone, the pressure oscillation amplitude firstly increased and then decreased with the axial dimensionless distance and there were obvious peak points. The pressure oscillation amplitude increased with the rise of water temperature, while decreased within the water temperature 55-60℃. Pressure oscillation amplitude of double-hole 1.2 increased firstly and then decreased with steam mass flux increasing, while the pressure oscillation amplitude of double-hole 1.5 and 2.0 decreased firstly and then increased with steam mass flux increasing. When steam mass flow rate was constant, the pressure oscillation amplitude under different water temperature decreased firstly and then increased along with the increase of hole pitch.