| Ultra supercritical steam turbine generator set has irreplaceable advantage in energy efficiency and emissions reduction, they will become the most important coal-fired power products in the near future. As the power of stand-alone turbine increasing steam parameters improving, turbine efficiency is becoming increasingly important.For the certain main steam parameter and backpressure of one project, the overall turbine efficiency only depends on the development of each turbine component .The flow path design of modern turbine is not only reflected in the optimization design of aerodynamic performance of turbine blade flow, but also the steam flow energy loss in all the steam turbine components from main steam valve to condenser, that is the aerodynamic design of steam turbine non-vane flow. In this paper, HP inlet flow path and LP inlet flow path of steam turbine non-leaves flow are numerically researched by CFX software, based on the 660MW supercritical steam turbine project of Shanghai Turbine Works.This paper presents the numerical simulation of HP inlet path, and emphasizes the flow field and aerodynamic property of HP inlet volute. On the basis of analysis on static pressure and pressure loss distribution on the several different cross sections of HP inlet pipe and the HP inlet volute, it is verified that the HP inlet path of USC 660MW steam turbine has good contour and flow path.This paper presents the numerical simulation of LP inlet path, and emphasizes the flow field and pressure loss from the IP exhaust hood to the zone before LP first stage. On the basis of calculated result, improved design plans is suggested to decrease further pressure loss from the IP exhaust hood to the zone before LP first stage.In this paper, further understanding about the unique structure of USC steam turbine at the aerodynamic aspects is achieved, which will lay the foundation for the further development of a higher parameter, greater capacity, air-cooled unit area.
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