Abstract
Steam is used as working fluid in power generation industry. Due to high pressure variations the steam condenses and forms two phase mixture. The condensation process in a turbo machine is in reality an essential random and unsteady phenomenon. The wet steam causes physical damage to the turbine blades and reduces its performance. It is very important for a turbine or nozzle designer to understand the behavior of this multiphase flow. Experimental prediction of condensation and variations in the steam flow parameters is difficult and costly. Hence in this work a comparison is made between equilibrium and non equilibrium mathematical models to predict properties of steam in converging diverging nozzles using a CFD tool FLUIDYN MP. The results are compared with the values in from literature work. Since the high speed involvement the steam stays in supercooled region and condensation initiates when the pressure drops below the Wilson line. Results of non equilibrium models were better and closer to experimental values when compared to equilibrium model.
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