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Influence of volumetric displacement and aspect ratio on the performance metrics of the rotating spool compressor.

Number: pap. 1177

Author(s) : BRADSHAW C. R., KEMP G., OROSZ J., et al.

Summary

A theoretical study of the influence of geometric design and scaling is presented for the rotating spool compressor. This study uses the previously developed comprehensive compressor model for the rotating spool compressor developed by Bradshaw and Groll (2013). The compressor aspect ratio (axial length to bore diameter) is varied between roughly 0.2 and 3.5 at eccentricity ratios (rotor diameter to bore diameter) of 0.825, 0.85, 0.893, and 0.92. It is found that for a given eccentricity ratio, there exists an optimum aspect ratio that maximizes the volumetric efficiency. Additionally, the eccentricity ratio shows a high level of sensitivity to the overall performance of the compressor. As the eccentricity ratio decreases, the overall isentropic efficiency of the compressor increases until an eccentricity ratio of 0.85. Below an eccentricity ratio of 0.85 the overall isentropic efficiency does not increase despite an increase in volumetric efficiency. The scaling study modifies the displaced volume using a set of scaling rules to determine the size of the compressor features as the compressor displacement changes. The study finds that as the volumetric displacement increases, the volumetric efficiency asymptotically increases. It is also found that there is an optimum in overall isentropic efficiency as the volumetric displacement increases which suggests a trade-off between sealing and port restrictions. Using the results of these two studies a 6th and 7th generation prototype spool compressor is proposed which has the potential to increase the overall isentropic efficiency by 5% and 6%, respectively.

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Format PDF

Pages: 8 p.

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Details

  • Original title: Influence of volumetric displacement and aspect ratio on the performance metrics of the rotating spool compressor.
  • Record ID : 30012812
  • Languages: English
  • Source: 2014 Purdue Conferences. 22nd International Compressor Engineering Conference at Purdue.
  • Publication date: 2014/07/14

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