Controlled reaction L-2R steam turbine blade

Details Controlled reaction L-2R steam turbine blade Controlled reaction L-2R steam turbine blade

1992-03-16

1994-01-11

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

415181, F01D 514

Patent

active

052775496

ABSTRACT:
A high performance steam turbine blade is provided in which the geometry of the blade airfoil is configured to minimize energy loss through the row of blades and control the radial distribution of the degree of reaction. The velocity of the steam over the blade surface is minimized to reduce friction losses, rapid deceleration of the steam velocity as it expands toward the trailing edge is avoided to prevent boundary layer separation and the reaction distribution is adjusted so that a relatively high reaction occurs at the base of the airfoil, thereby reducing secondary flow, and a relatively low reaction occurs at tip of the airfoil, thereby minimizing tip leakage. Specifically, the radial reaction distribution is such that in the hub region at least 20% of the stage pressure drop occurs in the blade row and in the tip region less than 50% of the stage pressure drop occurs in the blade row.

REFERENCES:
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patent: 3475108 (1969-10-01), Zickuhr
patent: 4533298 (1985-08-01), Partington et al.
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patent: 4676723 (1987-06-01), Kiger et al.
patent: 4718172 (1988-01-01), Rouse et al.
patent: 4765046 (1988-08-01), Partington et al.
patent: 4900230 (1990-02-01), Patel
patent: 4919593 (1990-04-01), Brown
patent: 5088894 (1992-02-01), Patel

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