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Effect of Casing Treatment and Variable Axial Guide Vanes on a Turbocharger Compressor Performance

[+] Author Affiliations
Hani Mohtar, Pascal Chesse, David Chalet, Anthony Yammine

Ecole Centrale de Nantes, Nantes, France

Paper No. GT2009-59190, pp. 47-54; 8 pages
doi:10.1115/GT2009-59190
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 5: Microturbines and Small Turbomachinery; Oil and Gas Applications
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4886-9 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

Engine downsizing is potentially one of the most effective strategies being explored to improve fuel economy. A main problem of downsizing using a turbocharger is the small range of stable functioning of the turbocharger centrifugal compressor at high boost pressures. Several stabilization techniques were studied to increase the compressor operating range without sacrificing the compressor efficiency. This paper presents an experimental study on a turbocharger compressor equipped with casing treatment (a map width enhancement system, MWE) and a variable inlet guide vane system (VIGV). A KKK turbocharger was modified and tested at Ecole Centrale de Nantes. The experimental program mainly dealt with traditional compressor performance measurements for an MWE (map width enhancement) structure with multitude of holes linking the annular flow passage and the impeller wheel, four different inner tubular length extensions and imparting positive and negative preswirl using VIGV system. The experimental studies have shown that while the MWE was advantageous in increasing pressure ratio at high compressor speeds, it failed in extending the compressor map. The different inner tubular length extensions have shown no significant effects on surge line improvement for this particular design. Results obtained from MWE system have been compared to those obtained when imparting positive and negative preswirl using an VIGV system.

Copyright © 2009 by ASME
Topics: Compressors

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