The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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A Study of Supersonic Nozzle Design for Partial Admitted Turbine Used on Organic Rankine Cycle

유기랭킨사이클용 부분분사터빈의 초음속노즐 설계에 대한 연구

  • 조수용 (경상대학교 항공기부품기술연구센터) ;
  • 조종현 (선테크(주) 기술연구소)
  • Received : 2013.11.14
  • Accepted : 2014.10.09
  • Published : 2014.12.01
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Abstract

Organic Rankine Cycle is widely used to convert the low-grade thermal energy to the electrical energy. However, usually available thermal energy is not supplied constantly. This makes hard to use positive displacement expanders. Hence, turbo-expander has merits to apply as an expander in ORC because it can operate well off-design points even though the mass flowrate is fluctuated. The thermal energy fluctuation causes the turbo-expander to operate in partial admission. In addition, supersonic nozzles are required so that the partially admitted turbine operates efficiently. In this study, R245fa was chosen as a working fluid of ORC. A design method and an analysis technique of supersonic nozzle based on R245fa were developed. The shape of the nozzle was designed by the characteristic method. The thermal properties within the nozzle were estimated and the predicted results were agreed well with the computed results.

Keywords

References

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