Quality coming out of the turbine

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SUMMARY

The discussion focuses on the calculation of thermodynamic quality (xv) in turbines using the equation H2 = Hl + xv(Hv - Hl). In a saturated two-phase state, total enthalpy is derived from both liquid and vapor enthalpies, represented by h = (1-x) hl + x hv. The context emphasizes that steam entering a turbine is typically superheated and transitions to a saturated state as work is extracted from the working fluid.

PREREQUISITES
  • Understanding of thermodynamic properties, specifically enthalpy.
  • Familiarity with the concepts of saturated and superheated steam.
  • Knowledge of turbine operation and momentum transfer principles.
  • Basic grasp of thermodynamic quality (x) in phase transitions.
NEXT STEPS
  • Study the principles of steam turbine thermodynamics.
  • Learn about the enthalpy calculations for two-phase systems.
  • Explore the differences between saturated and superheated steam states.
  • Investigate the impact of quality on turbine efficiency and performance.
USEFUL FOR

Engineers, thermodynamics students, and professionals involved in turbine design and operation will benefit from this discussion, particularly those focusing on steam quality and enthalpy calculations in thermal systems.

scott_for_the_game
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Another question. If your given the quality coming out of the turbine.

Why do you use say H2 = Hl + xv(Hv - Hl) to determine a xv even though u have one given?
 
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scott_for_the_game said:
Another question. If your given the quality coming out of the turbine.

Why do you use say H2 = Hl + xv(Hv - Hl) to determine a xv even though u have one given?

Well in a saturated 2 phase state, the total enthalpy is determined by the enthalpy in the liquid fraction and the enthalpy in the vapor one.

h = (1-x) hl + x hv = hl + x (hv - hl) where x is the thermodynamic quality.

Normally in a turbine, the steam entering is superheated and becomes saturated as work is extracted (momentum transfered) from the working fluid to the rotor and stator blades.
 

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