. Official proceedings . f^ ^o ^f % :^: I •1200 ^^/ I K^=/^oo \| W^ 74 Ill the diagrams (Figs. 5 to 11) the turbine rotors ofthe different types are taken with l)lade speeds of 500 feet persecond and an expansion of the steam from 165 pounds absokitcto I ])Ound absolute. In the diagram of the De Laval turbine (Fig. 5) it willbe seen that the jet of steam has a residual or leaving velocityafter passing the wheel of 3200 feet per second, which resultsin a failure to abstract the full energy of the jet proportionalto tiie square of such residual velocity. In order that one rowof impulse blades su
. Official proceedings . f^ ^o ^f % :^: I •1200 ^^/ I K^=/^oo \| W^ 74 Ill the diagrams (Figs. 5 to 11) the turbine rotors ofthe different types are taken with l)lade speeds of 500 feet persecond and an expansion of the steam from 165 pounds absokitcto I ])Ound absolute. In the diagram of the De Laval turbine (Fig. 5) it willbe seen that the jet of steam has a residual or leaving velocityafter passing the wheel of 3200 feet per second, which resultsin a failure to abstract the full energy of the jet proportionalto tiie square of such residual velocity. In order that one rowof impulse blades such as obtain in this example might extractthe maximum energy from the expansion of the steam fromj()^ pounds to I pound absolute, it would be necessary to havea blade speed of 1730 feet per second. In tlie Ratcau machine (Fig. 6) the residual velocity is2880 feet per second, representing an amount of energy un-abstracted l)y the turbine proportional to the square of thisresidual velocity. If additional stages were adde
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Keywords: ., bookauthorrailwayc, bookcentury1900, bookdecade1900, bookyear1901
