"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . if expanded into a 28 in. vacuum, it can attaina velocity of 4010 ft. per second, or nearly twice the speed of amodern rifle bullet, so that it is evidently impracticable to constructa wheel which can run at half the velocity of such a jet. Curtis Turbine. The Curtis turbine, while utilising the
"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . if expanded into a 28 in. vacuum, it can attaina velocity of 4010 ft. per second, or nearly twice the speed of amodern rifle bullet, so that it is evidently impracticable to constructa wheel which can run at half the velocity of such a jet. Curtis Turbine. The Curtis turbine, while utilising the principle of expanding thesteam through specially-shaped nozzles, has the great advantage thatit can be run with high efficiency at a relatively low speed. This isaccomplished in two ways, by means of—(i) velocity stages, and(2) pressure stages. 45 670 Verbal Notes and Sketches Velocity Stages. If a turbine such as just considered be run comparatively slowly,the buckets on the rotating wheel will absorb less of the velocity ofthe steam jet, but the steam emerging from the buckets will stillhave considerable velocity and will be available for use over again. If, therefore, the steam on emerging is redirected to a second rowof moving buckets fixed to the same wheel as the first row, it may be. No. 22.—Arrangement of Moving and StationaryElements in a Curtis Turbine. compelled to part with its remaining velocity in the second row ofmoving buckets. This method of fractionall) extracting the velocity of the steam,and known as a velocity stage, is used to a differing extent in thedesign of both Compound Impulse, and Combined Impulse, Curtisturbines. Steam entering the diverging nozzles (No, 22) at working pressureis expanded during its passage through them, and issuing at greatvelocity enters the first row of moving buckets. The steam leavesthese buckets in a backwards direction and enters the ring ofstationary buckets, in which it has its direction reversed, so that itenters th
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