498 APPLIED MECHANICS © 
16. In an inward flow turbine the water enters the inlet circumfe: 
2 feet diameter, at 60 feet per second, and at 10° to the tangent to the circ 
ference. The water leaves the inner circumference, 1 foot diameter, with 
radial velocity of 5 feet per second. The peripheral velocity of the inlet 
of the wheel is 50 feet per second. Find the angles of the vanes at th 
and outlet surface. [ 
17. An inward flow turbine wheel works under a head of 60 feet, and 
380 revolutions per minute. The diameter of the outer circumference 
wheel is 24 inches, and of the inner circumference 12 inches, The ve 
the water entering the wheel is 44 feet per second, and the angle it ma 
the tangent to the wheel is 10°. Assuming the radial velocity of flow t 
the wheel to be constant, and that the water leaves the wheel in a rad 
tion, determine the direction of the tangent to the vane of the wheel 
inlet and outlet. Sketch a suitable form of vane. Determine the h u 
efficiency of the turbine. ' a. 
18. Using the notation of Art. 429 and the result proved in Art. 446, p. | 
apply Bernoulli’s theorem to show that in a radial flow-reaction turbine rae 
vb ug—ul ofc? 
29° (og 29 
where hf is the available or effective head at the inlet surface. 
Show also that in an axial flow reaction turbine 
29g 
where h, is the depth of the wheel. a 
19. The supply of water for an inward flow reaction turbine is 500 cubic fee 
per minute, and the available head is 40 feet. The vanes are radial at the inlet. 
the outer radius is twice the inner, the constant velocity of flow is 4 feet p 
second, and the revolutions are 350 per minute, Find the velocity of the 
the guide and vane angles, the inner and outer diameters, and the width of 
bucket at inlet and outlet. aie 
PLEASE RETURN 
DEPT, of APPLIED MECHANOS, 
