Stationary airfoil-shaped components in turbines/expanders that direct and accelerate fluid flow onto rotating blades.
Stator vanes are stationary aerodynamic components positioned upstream of rotor blades in turbine or expander sections. Their primary function is to convert pressure energy into kinetic energy by accelerating and directing fluid flow at optimal angles onto subsequent rotating blades. They create controlled swirl, regulate mass flow rates, and maintain boundary layer stability while minimizing turbulence and pressure losses. In axial-flow configurations, they're arranged in circumferential rows with precise spacing to ensure uniform flow distribution.
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Stator vanes is the general term for stationary airfoils in turbomachinery. Nozzle guide vanes specifically refer to the first stator row immediately upstream of turbine rotors in gas turbines, where they function as convergent nozzles.
They optimize efficiency by: 1) Minimizing incidence losses through proper flow angle alignment, 2) Reducing secondary flow losses with endwall contouring, 3) Controlling wake interactions between blade rows, typically contributing 2-8% to stage efficiency.
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