TURBINE ASSEMBLY OF AN AXIAL-FLOW TURBINE AND AXIAL-FLOW TURBINE

原文（中国語）

Turbine assembly according to the present invention has passages formed in the fixing part of the second wheel of the assembly between at least some adjacent blades for draining the working medium that has leaked through the non-contact seal of the first wheel of the assembly from the axial gap further in the direction of expansion of the working medium back into the primary flow path. The passage inlet according to the present invention is located on the side of the fixing part facing the labyrinth seal of the preceding wheel radially between a virtual circle with the centre in the turbine assembly axis and a radius of R−0.6*A and a virtual circle with the centre in the turbine assembly axis and a radius of R+0.6*A, where Ris the inner and Rout is the outer radius of the radial gap of the last fin of the non-contact seal, and A is the axial distance between the last fin of the non-contact seal and the side of the fixing part of the next wheel facing the non-contact seal of the preceding wheel in operation. The passage outlet according to the present invention exits into the primary flow passage between the blades at an axial distance of at least ⅕ of the total axial width of the blade cascade from the leading edge of the blades.