Polytropic efficiency vs isentropic efficiency?

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SUMMARY

Polytropic efficiency is preferred over isentropic efficiency for analyzing multi-staged turbine and compressor machines due to its ability to provide a more accurate representation of performance across varying conditions. Unlike isentropic efficiency, polytropic efficiency remains independent of pressure ratio, allowing for a consistent evaluation of efficiency in quasi-static processes. This distinction is crucial for engineers seeking to optimize the performance of thermodynamic cycles in practical applications.

PREREQUISITES
  • Understanding of thermodynamic cycles
  • Familiarity with turbine and compressor operation
  • Knowledge of efficiency metrics in thermodynamics
  • Basic principles of polytropic processes
NEXT STEPS
  • Research the calculation methods for polytropic efficiency in multi-staged machines
  • Study the differences between polytropic and isentropic processes
  • Explore real-world applications of polytropic efficiency in engineering
  • Learn about the impact of pressure ratios on turbine and compressor performance
USEFUL FOR

Mechanical engineers, thermodynamics students, and professionals involved in the design and optimization of turbine and compressor systems.

jason.bourne
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been reading in many books that polytropic efficiency is always recommended over isentropic efficiency.

what are the advantages of using polytropic efficiency?

what makes it different from isentropic efficiency?

it is also told that polytropic efficiency is independent of pressure ratio? how is this possible?
 
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I always thought that polytropic efficiency was isentropic efficiency but at a incremental stage of a quasi-static process.
 
yes you are right.

but when these efficiencies are calculated for the turbine or compressor machines which are multi staged, then they differ a lot.
 

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