A Manual of the Mechanics of Engineering and of the Construction of Machines: Vol. II. Section II.--Application of Mechanics to Machines. Part I.--Hydraulics and Hydraulic Motors
A Manual of the Mechanics of Engineering and of the Construction of Machines: Vol. II. Section II.--Application of Mechanics to Machines. Part I.--Hydraulics and Hydraulic Motors
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 Excerpt: ... The water issued under a vertical sluice board, and passed through a guide race o.8 metre (2$ ft.) long to the wheel. This race, as well as the curb, was of cut stone, and the clearance was only 0.005 metre (0.2 inches). The fall was from 0.78 to 1 metre (3 ft.), the height back of the sluice was, however, o.15 to 0 ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 Excerpt: ... The water issued under a vertical sluice board, and passed through a guide race o.8 metre (2$ ft.) long to the wheel. This race, as well as the curb, was of cut stone, and the clearance was only 0.005 metre (0.2 inches). The fall was from 0.78 to 1 metre (3 ft.), the height back of the sluice was, however, o.15 to 0.45 metre (6 to 18 inches). The experiments were made for very different velocities of circumference. For very small velocities, the efficiency was also very small; for the velocity of 1 5 metres (5 ft.) it was the greatest, and when the velocity of the entering water was not far from v this the greatest efficiency was 0.49. For--within the limits and f, the mean was exactly as for the preceding wheel // = 0.74, and hence we have here also Morin gives the following as the results of his experiments upon curb-wheels: // being the total fall and Ji, the fall necessary for the velocity of entrance. Example.--What is the delivery of an undershot curb.wheel 15 ft. in diameter, which makes K = 8 revolutions per minute, and has a fall = 4 ft. and Q = 20 cubic ft. per second? The velocity of circumference is If, now, the entering velocity of the water is twice this, we have for the height of water behind the sluice opening hence 7 is only 0-42, and therefore, without reference to axle friction, the delivery is L = 0-42 x 3067 = 1288 ft. lbs. 212.--Wheels in Straight Raee.--The least delivery or mechanical effect is furnished by the undershot-wheel in straight race, because here the water acts by impact alone, and because a considerable quantity of water escapes without producing full effect. Such wheels are applied to small falls of less than 4 ft., because, in such case, a curb would give but little increase of effect. By reason of their small d...
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