Last stage rotor blade of steam turbine

Abstract

The last stage movable blade of steam turbine features the relative blade height H monotonously increased from 0.0 to 1.0, blade body profile with assembling angle c1 monotonously decreased from 82.81 deg to 10.1 deg, inlet geometric angle a1 monotonously increased from 36.65 deg to 168.0 deg, outlet geometric angle a2 monotonously decreased from 31.4 deg to 10.6 deg, relative maximum thickness w1 monotonously decreased from 3.47 to 1.0, relative chord length b1 monotonously decreased from 1.84 to 1.0, relative cross section area S monotonously decreased from 7.98 to 1.0, and the ratio between blade height H to root radius of 0.5-0.7. The present invention is especially suitable for sub-critical and supercritical steam turbine with effective blade height not smaller than 1200 mm, power of 600-1200 MW and rotation speed of 3000 rpm.

Description

technical field [0001] The invention relates to steam turbine blades, in particular to a final stage moving blade of a steam turbine, which is especially suitable for subcritical and supercritical steam turbines with blade effective height ≥ 1200mm, power 600MW-1200MW, and rotating speed 3000rpm. Background technique [0002] The steam turbine is one of the three main equipments of the thermal power plant. The moving blade installed on the shaft of the steam turbine is a crucial key component in the steam turbine, especially the structural design of the final stage moving blade, because it involves a wide range of technologies, technical High content and become the core technology of steam turbines. The larger the capacity of the steam turbine and the higher the power generation density, the higher the initial parameters are required, and the larger the exhaust annular area is, the longer the final stage blade is required. The longer the final stage blade, the higher the req...

AI Technical Summary

Problems solved by technology

The basic structures of the above-mentioned blades are similar, and the main difference is that the structural elements (ie, characteristic parameters) of the blade structure, especially the blade body structure, are different. The specific shapes of the various components of the blade are only similar, but not similar, and have their own characteristics. The technical performance of each has its own advantages and disadvantages, and the main performance parameters are interrelated, so it is difficult to evaluate them as a whole.

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