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Analysis of indicator diagrams of a water injected twin-shaft screw-type expander.

Number: pap.1501

Author(s) : NIKOLOV A., BRÜMMER A.

Summary

Twin-shaft screw-type expanders offer a high potential for energy conversion in the lower and medium power range, for instance as expansion engines in Rankine cycles for exhaust heat recovery. With regard to minimizing internal leakages and lubricating moving machine parts, an auxiliary liquid or liquid working fluid, for example in organic Rankine cycles (ORC)1, can be fed to the screw expander. In this paper, indicator diagrams of a twin-shaft screw-type expander prototype SE 51.2 designed at the Chair of
Fluidics at TU Dortmund University are presented and analyzed in detail. The experimental investigations are carried out on a hot-air test rig with an expander inlet manifold water injection. The time-dependent working chamber pressure is recorded by means of high-resolution absolute pressure transmitters. Hereby, specific aspects of working chamber pressure measurements are mentioned. Based on the indicator diagrams, relevant influence mechanisms on the expander's operational behavior resulting from water injection are determined. Additionally, the impact of the injected water on the expander’s delivery rate and mechanical efficiency is presented.

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Pages: 10 p.

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Details

  • Original title: Analysis of indicator diagrams of a water injected twin-shaft screw-type expander.
  • Record ID : 30019523
  • Languages: English
  • Source: 2016 Purdue Conferences. 23rd International Compressor Engineering Conference at Purdue.
  • Publication date: 2016/07/11

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