Penult-stage moving blade of air-cooled steam turbine

Abstract

The invention discloses a penult-stage moving blade of an air-cooled steam turbine. The effective height H of the penult-stage moving blade is equal to 420.0mm, and the root diameter Dr of the penult-stage moving blade is equal to 1905mm; the relative value of a blade height H is monotonically increased from 0.0 to 1.0; an installation angle c1 is decreased from 80.66 degrees to 28.56 degrees; the variation rule of an area A from a root section to a top section is that: A is more than or equal to 1.0 and is less than or equal to 3.309; the variation rule of an axial width Xa from the root section to the top section is that: Xa is more than or equal to 1.0 and is less than or equal to 2.173; the variation rule of an chord length b1 from the root section to the top section is that: b1 is more than or equal to 1.0 and is less than or equal to 1.053; and the variation rule of a maximum thickness W1 from the root section to the top section is that: W1 is more than or equal to 1.0 and is less than or equal to 2.137. The penult-stage moving blade is applied to subcritical, supercritical and ultra supercritical air-cooled steam turbines with the power of 500 MW to 1,000 MW and the rotating speed of 3,000 rpm.

Description

technical field [0001] The invention relates to moving blades of air-cooled steam turbines, especially suitable for subcritical, supercritical and ultra-supercritical air-cooled steam turbines with a power of 500MW to 1000MW and a rotating speed of 3000rpm. Background technique [0002] The air-cooled steam turbine is a special steam turbine. Its particularity lies in: it often operates under the condition of high back pressure and small volume flow, and the back pressure changes in a large range and frequently. Blade design. Moreover, the economy and safety of the air-cooled steam turbine are closely related to the thermal, aerodynamic, strength, and vibration design of the last three stages of low pressure. Only by optimizing the scheme design under complex multi-factor constraints can we design high-performance sub-final stage blades that match the final stage blades. [0003] All major steam turbine manufacturers in the world have their own style of sub-final stage bla...

AI Technical Summary

Problems solved by technology

[0003] All major steam turbine manufacturers in the world have their own style of sub-final stage blades that are suitable for large-capacity air coolers and match the final stage blades. They belong to the second and third generation air-cooled sub-final stage blades, with backward structures and high dynamic stress of the blades. , the unit economy is poor

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