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IMPULSE TURBINE: Schematic of impulse steam turbine is shown in Fig. It has single-stage having a nozzle fitted in the casing followed by ring of moving blades mounted on the shaft. Variation of velocity and pressure along the axis of turbine is also shown here. Here pressure drop occurs only in the nozzle and ideally no pressure drop occurs in blades. High pressure steam from boiler enters the nozzle through piping and leaves nozzle at predefined angle so as to smoothly flow over the moving blades. Steam velocity gets increased during its flow through nozzle due to its expansion occurring in it. During the passage of steam over the moving blades steam undergoes change in its’ direction while losing the velocity and thus causing rotation of moving blade ring mounted on shaft


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