Turbines Theoretical And Practical With Numerical Examples And Experimental Re
Turbines Theoretical And Practical With Numerical Examples And Experimental Re
De Volson Wood
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10 = /i, and other quantities as before, we find Rev. = 880; E = 0. 8361 ; y l = 0. 872, y, = 0. 869, where the ratio of y 1 -f- y a is good, but the other values are too large. In regard to the value of or, measurements on Francis plates (Lowell Hydraulic Experiments] show that a, as it is measured, will not exceed 22, and yet Rodmer gives the mean angle a as 28. We solve the problem with Rodmer's values y 9 = 22, a = 28, assuming /*, = 0. 10, ^ = 0. 05 ; also /*, = 0. 10 = /; with the followi...ng results : 78 HYDRAULIC MOTORS. TABLE XI. r t = 3. 38 ft. , r, = 4. 0 ft. , y l = 90, a = 28, y, = 22, 11 12. 9 ft. , Q = 136 cu. Ft. Mi = 0. 10 M 2 = 0. 05 Mi = 0. 10 M 2 = 0. 10 Rev per second. 869 8636 -^max P er cent 81 96 79 30 i feet per second 9 822 9 755 #2 feet per second 23 525 23 059 V 20 9012 20 770 Vi Ea (141) . . 668 673 Vo Eq. (141). . 650 663 7/, /W 1 027 1 015 The brake efficiency of this w r heel being 0. 79375, its hydraulic efficiency will probably be 81 or 82 per cent. , so that the last hypothesis above is not admissible.
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