Ljungström turbine, general info?

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SUMMARY

The Ljungström turbine is identified as an effective solution for extracting exhaust energy from turbo-shaft engines, particularly due to its compact design and compatibility with 3-axis CNC machining. Users in the industry refer to it as a "free power turbine," which is typically positioned downstream of a jet engine to provide rotary power for various applications. For those seeking to design a Ljungström turbine, resources such as historical articles dating back to 1915 and extensive online searches yield valuable information on design specifications and calculations.

PREREQUISITES
  • Understanding of turbo-shaft engine mechanics
  • Familiarity with CNC machining processes
  • Basic principles of thermodynamics and energy extraction
  • Knowledge of turbine design and performance metrics
NEXT STEPS
  • Research Ljungström turbine design calculations and sizing methodologies
  • Explore historical articles on Ljungström turbine development from 1915
  • Learn about the integration of free power turbines in jet engine systems
  • Investigate CNC machining techniques specific to turbine fabrication
USEFUL FOR

Engineers, turbine designers, and hobbyists involved in turbo-shaft engine projects or those interested in renewable energy solutions will benefit from this discussion.

Chincha40
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I'm currently building a turbo-shaft engine and I am trying to find a good, yet simple to build free power turbine for extracting the exhaust energy of the jet engine. The Ljungström turbine seems promising as it is compact and easily machined from a 3 axis cnc machine. Does anyone know of the sort of rough math I could do to know how big my turbine must be or where to get this information? Any recommended textbooks?
 
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Thread reopened after the OP clarified the meaning of "free energy"

"free power turbine" is what the guys in the industry call it. Its basically a power turbine located downstream of a jet engine. Usually used for providing rotary power to some device, a gen set, a vehicle a propeller etc.
 

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