. Official proceedings . 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«-. Turl)iiK- Assomljlv, Lontjitudinal Sectinn. Scnii-douhlc-Flow Turbine. intermediate reaction l)la(lino- Avas thus allowed to be propor-tioned \vith baldes of twice the heic^ht and half the number aswould have
. Official proceedings . 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«-. Turl)iiK- Assomljlv, Lontjitudinal Sectinn. Scnii-douhlc-Flow Turbine. intermediate reaction l)la(lino- Avas thus allowed to be propor-tioned \vith baldes of twice the heic^ht and half the number aswould have obtained had the entire reaction blading been madedoulile-tlow. Since the efficiency of reaction l)lading is a fimction of itslenoth. assuming- the blatle clearance the same, it is apparentthat this single double-flow construction is adaptable to turl^ineunits of moderately high capacity, depending on the rotativespeed. This construction is now used in turbo-generator unitsfor alternating current from 3000 to 15,000 kilowatts at s])eedsof 1500 to 1800 revolutions per minute. In the development of the high-powered turbo-generatoriniits ( aliove, say, 10,000 kilowatts at 1500 or 1800 revolutions),owing to the large voUmie of steam handled, the best propor-tioning results by making the reaction l)lading double-flow witha Curtis impulse wheel carr\ing two rows of blades and utilizedi
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