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Optimizing a Suction Channel to Improve Performance of a Centrifugal Compressor Stage

[+] Author Affiliations
Manabu Yagi, Takanori Shibata

Hitachi, Ltd., Ibaraki, Japan

Hideo Nishida, Hiromi Kobayashi, Masanori Tanaka, Kazuyuki Sugimura

Hitachi Plant Technologies, Ltd., Ibaraki, Japan

Paper No. GT2010-23019, pp. 2007-2017; 11 pages
doi:10.1115/GT2010-23019
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 7: Turbomachinery, Parts A, B, and C
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4402-1 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

Design parameters for a suction channel of process centrifugal compressors were investigated, and an optimizing method to improve efficiency by using the new design parameters was proposed. Both pressure loss and circumferential flow distortion in the suction channel were evaluated by using computational fluid dynamics (CFD). The main dimensions, which had a large influence on pressure loss and circumferential flow distortion, were identified by using design of experiments (DOE). Next, the passage sectional area ratios Ac /Ae , Ae /As , and Ac /As were found to be the dominant design parameters for the pressure loss and circumferential flow distortion, where Ac , Ae and As are passage sectional areas for the casing upstream side, casing entrance and impeller eye, respectively. Then the shape of the suction channel was optimized using Ac /Ae , Ae /As , and Ac /As . Finally, to evaluate the improvement effect of optimizing the values of Ac /Ae , Ae /As , and Ac /As on compressor stage performance, a base suction channel and an optimized type of suction channel were manufactured and tested. The design suction flow coefficient was 0.1 and the peripheral Mach number was 0.78. Test results showed that the optimized suction channel achieved 3.8% higher stage efficiency than the base one while maintaining the overall operating range from surge to choke. The method for optimizing suction channels by using the three described design parameters was concluded to be very effective for improving the stage efficiency.

Copyright © 2010 by ASME

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