Abstract
Unsteady 3-D flows through two-stage stator-rotor cascade channels in the steam turbine model developed by Mitsubishi Heavy Industry (MHI) are numerically investigated. In the low pressure steam turbine cascades, vapor flows generate water droplets mainly due to homogeneous nucleation. The mass generation rate for water droplets is modeled as a sum of the mass generation rate of critical-sized nucleus and the growth rate of a water droplet based on the classical condensation theory. The total pressure, the static pressure, and the yaw angle in span-wise directions obtained by the 3-D calculations are compared with the experimental data. Also the difference between dry and wet steam flows is discussed.
