STEAM TURBINE LOW PRESSURE CYLINDER STAGE GUIDE VANE Russian patent published in 2023 - IPC F01D9/04 F01D5/14 

FIELD: power engineering.

SUBSTANCE: invention relates to the field of power engineering, in particular steam turbine building, and can be used in the design of guide vanes included in the low-pressure cylinder stages of axial steam turbines. The guide vane has an aerodynamic profile with root and peripheral ends, curved input and output edges bent in the axial and tangential direction along the entire height of the aerodynamic profile, having a root and peripheral sections in height, as well as a middle section located between them. The inlet edge is bent in the axial direction at an angle of -7°<α<35°, variable over the entire height of the airfoil, while in the peripheral section the angle α continuously increases towards the peripheral end, and the inlet edge is bent in the direction against the steam flow in the specified section. The trailing edge is bent in the axial direction at an angle of -7°<β<35°, which is variable over the entire height of the airfoil, while in the peripheral section the angle β continuously increases from 0° to the maximum value at the peripheral end, and the trailing edge is bent in the downstream direction steam in the middle section and in the root section, and in the peripheral section - in the direction against the steam flow. The trailing edge is also curved in the tangential direction from the root end to the peripheral end in the direction of steam flow at an angle ε, variable over the entire height of the airfoil, and the angle 0°<ε<35° at the root section decreases from the root end to the peripheral end, and at the peripheral section and middle section angle 0°<ε<5°.

EFFECT: increasing the internal relative efficiency of the low-pressure cylinder stage of the steam turbine and, accordingly, the internal relative efficiency of the steam turbine, maintaining a satisfactory vibrational state of the rotor blades in the stage and reducing their erosive wear.

1 cl, 2 dwg