Validation of the CFD Tools against In-House Experiments for Predicting Condensing Steam Flows in Nozzles

The issues addressed in this work concern the condensing steam flows as a flow of two-phase medium, i.e., consisting gaseous phase and dispersed form liquid droplets. character necessity to treat real gas make numerical modeling last turbine channels very difficult. There are many approaches known solve problem numerically, mainly based on RANS method with Eulerian approach. In paper, two were compared. in-house CFD code, governing equations defined for gas–liquid mixture, whereas ANSYS CFX individual (except momentum equations). both codes, it was assumed that there no velocity slip between phases. main aim study show how different schemes can affect wet difficult sensitive type computation is. results compared against experimental data nozzles determined at Department Power Engineering Turbomachinery Silesian University Technology. presented be used benchmark test researchers model flows. geometries half an International Wet Steam Experimental Project (IWSEP) nozzle comparisons. static pressure measurements walls nozzles, Schlieren technique, droplet size measurement qualitatively identify location condensation onset its intensity. obtained by means codes showed their good capabilities terms proper prediction process; however, some visible differences field parameters. CFX, wave occurred much earlier experiments. However, code agreement experiments region. addition, mean diameter IWSEP closer data.