Semi-rotation speed nuclear turbine final stage moving blade

Abstract

The invention relates to a semi-rotation speed nuclear turbine final stage moving blade. A blade molded line is a variable cross-section torsion molded line. The semi-rotation speed nuclear turbine final stage moving blade has the following characteristic parameters: installation angle c1, chord length b1, maximum thickness w1, axial width Xa and sectional area A; a relative value of the height H of the blade increases monotonically from 0.1 to 1.0; an absolute value c1 of the installation angle decreases monotonically from 80.990 to 10.80; the variation principle of the relative value of the chord length b1 from a root sectional area to a top sectional area is that b1 is not greater than 1.557 and not less than 1.0; the variation principle of the relative value of the maximum thickness w1 from the root sectional area to the top sectional area is that w1 is not greater than 1.9465 and not less than 1.0; the variation principle of the relative value of the axial width Xa from the root sectional area to the top sectional area is that Xa is not greater than 8.387 and not less than 1.0; the variation principle of the relative value of the area A from the root sectional area to the top sectional area is that A is not greater than 5.553 and not less than 1.0; and the blade is composed by the lamination and smooth transition of 25 characteristic sections with different profiles and shapes along a blade height direction, wherein three of the characteristic sections are key sections: a section at 4.58% of H, a section at 51.00% of H, and a section at 96.99% of H, and the theory profile lines of the sections are described by the coordinates (X, Y) of 28 discrete points.

Description

technical field [0001] The invention belongs to the technical field of half-speed nuclear power steam turbine flow, and specifically relates to the last-stage moving blade of the half-speed nuclear power steam turbine. Background technique [0002] Blade profile design and development technology is the key technology of steam turbine flow technology, and its level directly determines the quality of steam turbine flow economy. A good profile can not only make the flow economy of the steam turbine better, but also make the structural design of the flow parts simpler. How to develop profiles with better aerodynamic performance and structural performance is the key task of steam turbine manufacturers all over the world. [0003] From the perspective of traditional blade profile design, it is very difficult to develop a new set of profile design and involves a lot of work. A good steam turbine blade profile should not only have good performance under design conditions, but also...

AI Technical Summary

Problems solved by technology

[0003] From the perspective of traditional blade profile design, it is very difficult to develop a new set of profile design, involving a lot of work content

A good steam turbine blade profile should not only have good performance under design conditions, but also have good performance under variable conditions, and due to the immaturity of profile performance prediction tools, more often the profile development needs to be determined through aerodynamic tests. Verification is costly and time-consuming but often does not yield good results

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