. Applied thermodynamics for engineers. ket A at the velocity v^ the bucket itself moving at the speedu. The velocity of the steam rela-tive to the bucket is then repre-sented in magnitude and directionby V. The angles a and e madewith the plane of rotation of thebucket wheel are called the absoluteentering and relative entering anglesrespectively. Analytically, sin e = vsin a-^V. The stream traversesthe surface of the bucket, leaving it with the relative velocity x\which for convenience is drawn as x from the point 0. Without bucket friction, x = V. Theangle / is the relative angle ofexit. La
. Applied thermodynamics for engineers. ket A at the velocity v^ the bucket itself moving at the speedu. The velocity of the steam rela-tive to the bucket is then repre-sented in magnitude and directionby V. The angles a and e madewith the plane of rotation of thebucket wheel are called the absoluteentering and relative entering anglesrespectively. Analytically, sin e = vsin a-^V. The stream traversesthe surface of the bucket, leaving it with the relative velocity x\which for convenience is drawn as x from the point 0. Without bucket friction, x = V. Theangle / is the relative angle ofexit. Laying off w, from 2, wefind Y as the absolute exit ve-locity, with g as the absoluteangle of exit. Then, if x = V^sin g z= Y sin f -~ Y. To include the effect of nozzleand bucket friction, we proceedas in Fig. 249, decreasing v toVI — m of its original value(Art. 519), and making x less than Vhj from 5 to 20 per cent, asin ordinary practice. As before, ^m e = v sin a-i-V; but for a bucketfriction of 10 per cent, sin^ = Fsin/-T- Fig. 248. Art. 527. — Velocity Diagram.
Size: 1864px × 1340px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1913
