Experimental investigation on magnitude of pressure oscillation due to the sonic steam jet condensation

The magnitude of pressure oscillation caused by direct contact condensation of sonic steam jet was investigated experimentally. The steam mass flux was in the range of 512~865 kg/(m² · s) while the cooling water temperature 20~55°C. The nozzle diameter was 8 mm. Typical steam plume shapes as contraction shape, expansion-contraction shape, double expansion-contraction shape and double expansion-divergent shape were observed in the experiments. Meanwhile the average pressure pulse distribution maps, relationships between the average pressure pulse and the cooling water temperature, the average pressure pulse and the steam mass flux were given. The experimental results indicated that the average pressure pulse curve increased with the increasing temperature of cooling water. And the average pressure pulse increased significantly with the increasing steam mass flux near the nozzle exit, while keeping constant far away from the exit.