The wet steam two phase non-equilibrium condensation flows in turbine results in blade erosion and losses in efficiency.Non-equilibrium condensation

speed difference in two phases and water film on blade surface can cause wetness losses.The progress of the wetness losses was reviewed.The existing research methods and present problems were concluded.The basic wetness losses has been carried out including the thermodynamic loss

drag loss

impact loss

collected water loss

centrifuging loss and exit loss.The thermodynamic loss in the LP cylinder accounts for 80% of the wetness losses.The drag loss and the impact loss have small proportions in the total losses.The influence factors of wetness losses were studied.In addition

this paper introduced the method of numerical studies of two-phase flow condensation

droplets distribution

wetness losses calculation method

and so on.Quantitative evaluation of wetness losses provides a theoretical reference for flow passage design and modification.