Author/Authors :
Lin, A. Q College of Power and Energy Engineering - Harbin Engineering University, Harbin, China , Chang, X. Y School of Energy and Power Engineering - Northeast Electric Power University, Jilin, China , Cao, L. H School of Energy and Power Engineering - Northeast Electric Power University, Jilin, China , Zhang, H College of Power and Energy Engineering - Harbin Engineering University, Harbin, China , Sun, L. X College of Nuclear Science and Technology - Harbin Engineering University, Harbin, China
Abstract :
The condensation of wet steam has important effects on the behavior of the flow field. To evaluate the
aerodynamic performance of exhaust passage influenced by wet steam phase change condensation, a
numerical investigation was conducted. Taking a 600 MW steam turbine as an example with consideration of
the wet steam from the last stage blade and the steam exhaust of the BFPT (boiler feed water pump turbine),
the governing equations of wet steam two-phase flow were adopted by the Eulerian-Eulerian approach.
Results show that the wetness in the stator domain increases gradually while the wetness in the rotor domain
varies little on the pressure surface and is in small increment on the suction surface. The velocity uniformity
can be improved at condenser throat outlet as the mass flow or wetness increases. Moreover, the trend to
improve the aerodynamic performance of exhaust passage benefits from the improvement of wetness at the
last stage blade inlet. Conversely, with the increment of wetness at the BFPT inlet, the static pressure
recovery coefficient reduces by 5.8% and the total pressure loss coefficient increases by 2.4%, resulting in a
reduction of aerodynamic performance of exhaust passage.
Keywords :
Last stage blade , Aerodynamic performance , Wet steam , Exhaust passage
