Posted By: Santos Cossa

February 22, 2017
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Between the impulse and reaction turbines which one has high exit pressure and why ? which one exerts more work on rotating the turbine shaft ? please assist ..

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Nitin

February 25, 2017
Same pressure drop can be designed in both impulse and reaction...its the type of compounding which governs the exit pressure...multiple stages reduce the pressure considerably as per requirement...in reaction blades as steam expands in both moving and fixed blade the work done across a stage is more hence there are benefits like better inter-stage sealing, reduction in blade size etc
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Santos

February 27, 2017
ok I understand the difference in terms blade arrangement but what is the main difference between the 2 in practical way ? . nowadays is it possible to design a fully reaction or completely impulse turbine for generating plants
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Nitin

February 27, 2017
in impulse turbine blade there is no pressure drop across the moving blade (steam does not expand in moving blade), the pressure drop happens only in the fixed blades (nozzles) whereas in reaction blades, the moving blades act as nozzles too meaning there is a pressure drop across moving blade. usually the steam turbine blades are a mix of impulse and reaction, its known as degree of reaction which is usually 0.5.
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Santos

February 28, 2017
ok ... that is very clear . thanks
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