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US 4,900,230 AGranted
Low pressure end blade for a low pressure steam turbine
AssigneeWestinghouse Electric Corp.
InventorAshok T. Patel
Life of this patent
Estimating the term…
Abstract
Replacement low pressure end blading for a utility power steam turbine having an extended length compared to original equipment end blading providing higher efficiency. The blading incorporates extended flat areas on the blade trailing edge for improved flow characteristics and reduced losses. Mass distribution is used to tune the blade to avoid natural harmonic frequencies coincidental with turbine rotational frequencies or harmonics thereof. Blade root modifications are included to facilitate installation.
Claims2
Blading for a steam turbine formed in accordance with the following table:
- ______________________________________ POSITION (IN. FROM ROOT) 0.0000 2.0010 5.0000 8.0000 11.0000 ______________________________________ WIDTH 4.25000 3.98599 3.59000 3.19487 2.80004 (IN) CHORD 4.27696 4.06846 3.80152 3.57532 3.38230 (IN) STAG- 5.99407 11.14957 18.87216 26.44029 34.00799 GER ANGLE (DEG) MAXI- .49309 .49336 .47970 .44171 .36554 MUM THICK- NESS (IN) MAXI- .11528 .12127 .12619 .12354 .10807 MUM THICK- NESS/CH EXIT 37.00990 37.01522 36.77622 36.01430 34.88362 OPENING ANGLE (IN) INLET 44.17650 47.84891 51.44978 55.15249 61.38140 METAL ANGLE (DEG) INLET 11.40081 16.53943 22.84699 25.47453 25.91233 INCL. ANGLE (DEG) EXIT 36.81575 36.88426 36.67086 35.98107 34.85368 METAL ANGLE (DEG) EXIT -.36321 -.26176 -.21057 -.06632 -.05841 INCL. ANGLE (DEG) SUCTION .01252 .00007 .00007 .00006 .00072 SURFACE TURN AREA 1.59755 1.46661 1.24542 1.02627 .75902 (IN**2) ______________________________________ POSITION (IN. FROM ROOT) 13.0000 15.0000 17.0000 20.0000 23.5000 ______________________________________ WIDTH 2.53499 2.27502 2.02001 1.63994 1.22000 (IN) CHORD 3.27467 3.18522 3.11362 3.02030 2.98616 (IN) STAG- 39.25621 44.50158 49.74360 57.49909 66.50863 GER ANGLE (DEG) MAXI- .30734 .27120 .25398 .23791 .19786 MUM THICK- NESS (IN) MAXI- .09385 .08514 .08157 .07877 .06626 MUM THICK- NESS/CH EXIT 33.54951 31.98439 30.03656 26.06724 20.73475 OPENING ANGLE (IN) INLET 68.72656 84.54536 101.66240 131.52230 156.12210 METAL ANGLE (DEG) INLET 24.68350 22.48244 21.19228 17.00538 12.38879 INCL. ANGLE (DEG) EXIT 33.53928 31.97012 30.03510 26.05414 20.72697 METAL ANGLE (DEG) EXIT -.02031 -.01361 -.00290 -.00751 -.01513 INCL. ANGLE (DEG) SUCTION .00007 .00746 .00002 .00920 .00020 SURFACE TURN AREA .64368 .54398 .49238 .44678 .38695 (IN**2) ______________________________________
Dependencies are inferred from the claim text.