Discussion
The blade channel area in impulse steam turbine is
Answer: C
The blade channel area in an impulse steam turbine is constant. In an impulse turbine the steam expands in the nozzles, not in the blades, so the blade passage has the same area at inlet and outlet and the pressure is the same on both sides of the moving blades. In a reaction turbine the moving blade channel is converging, so the area decreases continuously, which is why the options of increasing or decreasing area are wrong.
Steam gains velocity only in the fixed nozzles. Across the moving blades of a simple impulse stage the relative velocity stays nearly the same, apart from friction, so no change of channel area is needed.
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