Numerical simulation of 3D viscous flow in exhaust casing of a low-pressure steam turbine

Numerical results of a 3D viscous flow in an exhaust casing of a low-pressure steam turbine were obtained with the 3D Navier-Stokes solver Fine/Turbo, which are in good agreement with the available experimental data in velocity, static and total pressure coefficients. The computational results reveal a complex vortex system within the casing model, including passage vortex, separation vortex and endwall vortex. Of all the vortices, most of energy losses within the casing is contributed by the passage vortex. The calculated overall mass averaged total pressure loss in the casing is nearly 47.8%, very close to the experimental value of 40.9%.