. Official proceedings . Rotors of Two 500-Horsepower Steam Turbines: Upper Spindle With Complete Reaction Blading; Lower Spindle \\ith Impulse and Reaction Blading. 89 reqniri.(l l)v the straight Parsons machine were entirely dispensed\vith, and while for dotible-flow construction twice the numberof blades were required as for similar conditions with single-flow, yet the application of the impulse wheel to the high-pres-sme stages made possible, in a great many instances, the propermechanical design, on account of the considerable shorteningof the turbine due to the introduction of the impuls
. Official proceedings . Rotors of Two 500-Horsepower Steam Turbines: Upper Spindle With Complete Reaction Blading; Lower Spindle \\ith Impulse and Reaction Blading. 89 reqniri.(l l)v the straight Parsons machine were entirely dispensed\vith, and while for dotible-flow construction twice the numberof blades were required as for similar conditions with single-flow, yet the application of the impulse wheel to the high-pres-sme stages made possible, in a great many instances, the propermechanical design, on account of the considerable shorteningof the turbine due to the introduction of the impulse wheel,thus allowing a length of spindle and cylinder of propermechanical stability. As this development progressed it was found advisable, onthe score of efficiency, to resort to the A\cstinghouse singledouble-flow construction. This diliers from the straight double-flow principle in utilizing a single Curtis impulse wheel withtwo rows of revolving i)la(les. followed bv a single barrel of. G. \\cstin,e:hnii>e l-luid Pressure Turbine,reaction blades, after which half of the steam is allowed to passthrough the drum around a balancing piston (for the singlebarrel of Parsons blades) to half of a double-flow expansionof reaction blading, and thence into a double exhaust openingat either end of the turbine, as illustrated in Fig. 17. The 90 ii«-. 17.
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Keywords: ., bookauthorrailwayc, bookcentury1900, bookdecade1900, bookyear1901
