Numerical Simulation On Skew Stator Of Middle Pressure Cylinder And High Pressure Cylinder In An Ultra Supercritical Steam Turbine

Based on environmental requirements, clean and efficient coal-fired power generation technology will become one of the main development directions of electric power industry in the world, high capacity, high parameter is the most effective way to improve the economics of thermo-power plant; ultra supercritical steam turbine plays more and more important role in our country. Based on the data of the IP/HP cylinder, numerical simulations for the first stage skew stator and the IP/HP Cylinder was studied through CFX.In this IP/HP inlet steam chamber,existed a kind of unique stators, the stators play the role of diversion, without radial steam leakage. Though the flow in the cylinder was asymmetry, the circumferential asymmetry was studied through flow angle distribution at the inlet and blade surface pressure distribution at several different circumferential positions. The circumferential asymmetry at the downstream of skew stator was also discussed.This paper focused on the IP/HP cylinder skew stator, the asymmetry of upstream would be weaken after the steam go through the stator, it also could guarantee working conditions of downstream rotor. This study is useful for further digestion and absorption of the introduction of ultra-supercritical unit design technology and can improve the existing aerodynamic design system. For enhancing China's own ultra-supercritical steam turbine aerodynamic design level, it has important theoretical significance.