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Analysis of the Turbocharger Compressor Surge Margin Using a Hurst-Exponent-based Criterion
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.ORCID iD: 0000-0002-4937-8915
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.ORCID iD: 0000-0001-9483-7992
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx). KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7330-6965
2016 (English)In: SAE International Journal of Engines, ISSN 1946-3936, E-ISSN 1946-3944, Vol. 9, no 3Article in journal (Refereed) Published
Abstract [en]

Turbocharger compressors are limited in their operating range at low mass flows by compressor surge, thus restricting internal combustion engine operation at low engine speeds and high mean effective pressures. Since the exact location of the surge line in the compressor map depends on the whole gas exchange system, a safety margin towards surge must be provided. Accurate early surge detection could reduce this margin. During surge, the compressor outlet pressure fluctuates periodically. The Hurst exponent of the compressor outlet pressure is applied in this paper as an indicator to evaluate how close to the surge limit the compressor operates. It is a measure of the time-series memory that approaches zero for anti-persistence of the time series. That is, a Hurst exponent close to zero means a high statistical preference that a high value is followed by a low value, as during surge. Maps of a passenger-car sized turbocharger compressor with inlet geometries that result in different surge lines are measured on a cold gas stand. It is demonstrated that the Hurst exponent in fact decreases as the compressor moves towards surge, and that a constant value of the Hurst exponent can be used as a threshold for stable operation. Transient pressure signals of the compressor entering surge are analyzed in order to evaluate the time lag until surge can be detected using the Hurst exponent. Two surge cycles are usually needed to detect unstable operation. However, since the amplitude of these oscillations is relatively small for the first cycles, detection is possible before the oscillations grow into deep surge.

Place, publisher, year, edition, pages
SAE International , 2016. Vol. 9, no 3
Keyword [en]
Centrifugal compressor, surge analysis, surge detection, surge margins, Turbocharging, Hurst exponent
National Category
Mechanical Engineering
Research subject
Engineering Mechanics
URN: urn:nbn:se:kth:diva-185757DOI: 10.4271/2016-01-1027OAI: diva2:923430
Compressor Off-design Operation- CCGEx
Swedish Energy Agency

QC 20160429

Available from: 2016-04-26 Created: 2016-04-26 Last updated: 2016-04-29Bibliographically approved

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Kerres, BertrandNair, VineethCronhjort, AndreasMihaescu, Mihai
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Optics and Photonics, OFOKTHInternal Combustion EnginesMechanicsCompetence Center for Gas Exchange (CCGEx)Linné Flow Center, FLOW
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