Effects of non-equilibrium condensation on aerodynamics of the ow field in a steam turbine cascade

In the present paper, an in-house cfd code is developed using roe scheme to simulate a condensing two-phase ow in blade to blade passage of a steam turbine. effects of condensation on the ow field of steam turbine rotor tip section are investigated for different outlet pressures. firstly, comparison is performed between results of wet and dry cases. then, effects of outlet pressure variations on the ow field are studied. finally, effects of condensation on different specifications of the ow yield (total pressure loss coeficient, entropy generation, and deviation angle) are investigated. also, the mechanism of ow deviation in the cascade ow field is described. condensation has a great inuence on the behavior of the ow field based on the numerical results of this paper. it changes the outow direction, and consequently the ow entering to the next blade deviates from its on-design condition; thus, additional losses are produced. for example, the value of deviation angle reaches 7:62◦ for wet case and exit mach number me = 1:45. also, there are stagnation pressure loss and entropy generation due to non-equilibrium condensation that reduce the eciency of the steam turbine.