Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . or Riedler-Stumpf types, it is stated that thereis no appreciable change in velocity loss when the radial clearance (between thenozzle and the buckets) is increased from .10 to .40 inch. 148 THE STEAM TURBINE of iron oxide (rust) will be carried away by the steam to actlike a sand blast on the blades in succeeding stages. Steel is anexceptionally good material for blades under favorable condi-tions because it can be rolled cheaply into bars of any shape of section,* and
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . or Riedler-Stumpf types, it is stated that thereis no appreciable change in velocity loss when the radial clearance (between thenozzle and the buckets) is increased from .10 to .40 inch. 148 THE STEAM TURBINE of iron oxide (rust) will be carried away by the steam to actlike a sand blast on the blades in succeeding stages. Steel is anexceptionally good material for blades under favorable condi-tions because it can be rolled cheaply into bars of any shape of section,* and it is unequaledfor strength. Copper alloys,known in the trades as ex-truded metal, are made intobars of any shape of sectionby drawing as wire ismanufactured. Blades of thismaterial are not strong enoughfor the highest velocities usedin some modern types. No metal has all the phys-ical properties desirable in a blading material. A compoundmetal known as Monnot or duplex metal has been developedbut has found little use, which is a disappointment. It consistsof a steel core covered with a thin copper sheathing chemically. Fig. 58. Etched Section of a Blade madeof Monnot Metal (Steel and Copper).
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkwiley, books
