Turbine blade body structure

Abstract

The invention discloses a turbine blade body structure. A two-dimension blade profile of a blade body is a crescent closed curve defined by an inner arc curve and a back arc curve; the blade body has a characteristic parameter chord length CH, and an axial width CX; the blade body is formed by twisting and superimposing multiple two-dimension blade profiles according to a certain rule, and has a characteristic parameter blade body height H; the chord length CH of the two-dimension blade profile accords with a parabolic distribution rule from the root area to the top area in the blade height direction; a trend is that the chord lengths of the root area and the top area of the blade body are high, and the chord length of the middle area of the blade body is low; and the axial width CX of the two-dimension blade profile substantially remains unchanged. The turbine blade body structure can allow the turbine blade to simultaneously give consideration to different main loss sources of the root area, the top area and the middle area, thereby effectively and reliably improving the aerodynamic performance of the turbine blade and reducing aerodynamic loss.

Description

technical field [0001] The invention relates to a turbine blade, in particular to a blade body structure of a turbine blade. Background technique [0002] The airfoil shape of the existing turbine blades is mainly limited to the surface friction loss of the two-dimensional airfoil (the two-dimensional airfoil refers to the shape of the cross-sectional profile of the airfoil), that is, the profile loss, which is mainly considered It is the middle area of ​​turbine blade airfoil (that is, the main flow area), and the secondary flow loss is not considered. However, in the structure of the turbine blade, another main source of the loss of the airfoil profile of the turbine blade is the secondary flow loss in the airfoil end area (ie, the root area and the top area of ​​the turbine blade airfoil). This turbine blade airfoil structure, which does not consider the secondary flow loss, has the technical problems of low aerodynamic performance and high aerodynamic loss. Contents o...

AI Technical Summary

Problems solved by technology

[0002] The airfoil shape of the existing turbine blades is mainly limited to the surface friction loss of the two-dimensional airfoil (the two-dimensional airfoil refers to the shape of the cross-sectional profile of the airfoil), that is, the profile loss, which is mainly considered It is the middle area of ​​the blade body of the turbine blade (that is, the main flow area), and does not consider the secondary flow loss

However, in the structure of the turbine blade, another main source of the loss of the turbine blade airfoil is the secondary flow loss in the airfoil end area (that is, the root area and the top area of ​​the turbine blade airfoil)

This turbine blade airfoil structure, which does not consider the secondary flow loss, has technical problems of low aerodynamic performance and high aerodynamic loss

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