Steam Turbines
Impulse Turbine
Pressure compounding
where, N = Nozzle,
MB = Moving blade
The pressure drop occurs only in the nozzle. There is no pressure drop while steam flows through the blades.
Velocity compounding
where, SB = Stationary blade
All the pressure drop and enthalpy drop of steam takes place in a single row of nozzles.
(ΔH)stage = (ΔH)total / Total number of stage
Reaction Turbine
- Optimum velocity ratio, ρ = cos α
- Maximum efficiency, ηmax = 2cos2α / 1+cos2α
- Degree of reaction, R = Enthalpy drop in moving blade / Total enthalpy drop
Velocity & Pressure variation in reaction turbine
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Must Read: What is thermodynamics in Mechanical Engineering?
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