Ljungström turbine, general info?

AI Thread Summary
The Ljungström turbine is considered a compact and easily machined option for extracting exhaust energy from jet engines, often referred to as a "free power turbine." It is typically used to provide rotary power for various applications, including generators and vehicles. For those looking to determine the appropriate size for their turbine, a Google search yields over 11,400 results, including valuable resources and historical articles dating back to 1915. Recommended textbooks and further mathematical guidance on turbine design can be found through these online resources. This turbine design offers a practical solution for enhancing the efficiency of turbo-shaft engines.
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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