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Optimal Pressure based Detection of Compressor Instabilities using the Hurst Exponent
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.). (Competence Center for Gas Exchange (CCGEx))
KTH, School of Engineering Sciences (SCI), Mechanics. (CCGEx, FLOW)ORCID iD: 0000-0001-7330-6965
Univ. of Cincinnati.
Aerospace Engineering, University of Cincinnati.
2017 (English)In: SAE International Journal of Engines, ISSN 1946-3936, E-ISSN 1946-3944, Vol. 10, no 4, 2017-01-1040Article in journal (Refereed) Published
Abstract [en]

The compressor surge line of automotive turbochargers can limit the low-end torque of an engine. In order to determine how close the compressor operates to its surge limit, the Hurst exponent of the pressure signal has recently been proposed as a criterion. The Hurst exponent quantifies the fractal properties of a time series and its long-term memory. This paper evaluates the outcome of applying Hurst exponent based criterion on time-resolved pressure signals, measured simultaneously at different locations in the compression system. Experiments were performed using a truck-sized turbocharger on a cold gas stand at the University of Cincinnati. The pressure sensors were flush-mounted at different circumferential positions at the inlet of the compressor, in the diffuser and volute, as well as downstream of the compressor. Results show that the previously identified threshold value distinguishing between surge and stable operation when the analysis was carried out for a different and smaller compressor can be used also for this much larger compressor. The investigation concerning the sensor locations reveals that pressure sensors at the outlet or shortly upstream the volute tongue give the clearest distinction between fully stable operation and operation close to the surge line. Further investigations show that as currently implemented, the criterion would need a minimum sampling duration of 500 ms and sampling frequency of 512 Hz. An extended algorithm based on distinguishing between a mono- and multifractal pressure signal is shown to have potential as an early warning indicator.

Place, publisher, year, edition, pages
SAE International , 2017. Vol. 10, no 4, 2017-01-1040
Keyword [en]
centrifugal compressor, instabilities, surge, time-resolved pressure signals, Hurst exponent
National Category
Vehicle Engineering Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics; Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-203268OAI: oai:DiVA.org:kth-203268DiVA: diva2:1081829
Projects
CCGEx, Compressor off-design
Funder
Swedish Energy Agency
Note

QC 20170321

Available from: 2017-03-15 Created: 2017-03-15 Last updated: 2017-03-21Bibliographically approved

Open Access in DiVA

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https://saemobilus.sae.org/content/2017-01-1040

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