TAILIEUCHUNG - An Encyclopedia of the History of Technology part 32

An Encyclopedia of the History of Technology part 32. This one of a kind encyclopedia presents the entire field of technology from rudimentary agricultural tools to communication satellites in this first of its kind reference source. Following an introduction that discusses basic tools, devices, and mechanisms, the chapters are grouped into five parts that provide detailed information on materials, power and engineering, transportation, communication and calculation, and technology and society, revealing how different technologies have together evolved to produce enormous changes in the course of history | PART TWO POWER AND ENGINEERING Figure Schematic arrangement of the basic steam turbine types. a Simple impulse turbine de Laval . Key 1 stationary nozzles 2 rotating blades 3 wheel 4 rotating shaft. The lower diagram shows the change in pressure P and velocity V of the steam as it passes through the turbine. b Reaction Turbine Parsons . Key 1 Nozzles and guide vanes 2 rotating blades 3 rotating drum 4 rotating shaft. The conical drum counteracts the decrease in density of the steam as it passes through the turbine. This arrangement was not used by Parsons who employed a limited number of step changes in drum diameter. The lower diagram shows the change in pressure P and velocity V of the steam as it passes through the turbine. 292 STEAM AND INTERNAL COMBUSTION ENGINES c Pressure-compounded impulse turbine Rateau . Key 1 nozzles 2 rotating blades 3 nozzles in diaphragm 4 rotating wheels 5 rotating shaft. The lower diagram shows the change in pressure P and velocity V of the steam as it passes through the turbine. d Velocity-compounded impulse turbine Curtis 1896 . Key 1 nozzles 2 rotating blades 3 stationary guides 4 rotating wheels 5 rotating shaft. The lower diagram shows the change in pressure P and velocity V of the steam as it passes through the turbine. Reproduced from Two Historic Prime Movers ASME Paper number 84-WA HH-2 1984 . impulse turbine that is now commonly known by his name. The principle of this turbine is illustrated in Figure c . As in the Parsons turbine the pressure drop is divided between a number of stages thereby limiting the steam speed. This type of turbine avoids the leakage problem of the Parsons turbine by only using each stage pressure drop in the stationary nozzles. The Rateau turbine is classed as a pressure-compounded impulse turbine. The Rateau turbine differed from the Parsons turbine in another important respect. In the latter the moving blades are attached to the periphery of a .

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