Wet steam condensation flows presents a high degree of non-equilibrium characteristics. At present

the condensation parameters are obtained by using semi-empirical formula

while heat transfer temperature difference and coupling problems are seldom considered. A simple condensation nucleation model and droplet growth model for non-equilibrium phase change of wet steam is established in this study. In order to calculate the wet steam parameters and condensation shock wave distribution of non-equilibrium condensation flows

the second-order TVD scheme is adopted. The influence of thermodynamic properties of inlet wet steam on the non-equilibrium condensation flow is examined

the influence of inlet pressure on the condensation characteristic is discussed

and various patterns of inlet subcooled temperature on nucleation rate

droplet number

condensation shock are summarized. It is found that as inlet pressure increases

the condensing location moves upstream. At a lower import subcooled temperature

the condensing position moves downstream. At higher Mach number

nucleation occurs. As the import subcooled temperature increase

the wetness of non-equilibrium condensation phase transition will be higher. After the onset of condensation shock

steam expands continuously along the nozzle and the flow pattern is similar to isentropic flow.