Inviscid and viscous numerical simulation for non-equilibrium spontaneously condensing flows in steam turbine blade passages

摘要

A two-dimensional and three-dimensional mathematical model for numerical investigation of spontaneously condensing steam flow in cascades and stages has been developed. The numerical technique is based on the Euler and Navier-Stokes equations and is capable of predicting both subsonic and supersonic flow regimes. The gasdynamic equations are linked with the classical nucleation theory and droplet growth laws. Numerical procedure is time-marching, implicit, second order accurate by space and time coordinates, and exhibits high resolution shock capturign ability. THe theory takes into account heat release, phase transition and interaction between phases. Viscous flow field calculations reveal development of the condensed mass fraction in the shear boundary layers and wakes. Distributions of the cooling rate, droplet radius and parameters of the bulk flow are also predicted.