Measurement, analysis and modeling of compressor flow for low pressure ratios
2016 (English)In: International journal of engine research, ISSN 1468-0874, Vol. 17, no 2, 153-168 p.Article in journal (Other academic) Published
Increasingly stringent emissions legislation combined with consumer performance demands, have driven the development of downsized engines with complex turbocharger arrangements. To handle the complexity model-based methods have become a standard tool, and these methods need models that are capable of describing all operating modes of the systems. The models should also be easily parametrized and enable extrapolation. Both single and multiple stage turbo systems can operate with a pressure drop over their compressors, both stationary and transient. The focus here is to develop models that can describe centrifugal compressors that operate both in normal region and restriction region from standstill to maximum speed. The modeling results rely on an analysis of 305 automotive compressor maps, whereof five contain measured restriction operation, and two contain measured standstill characteristic. A standstill compressor is shown to choke at a pressure ratio of approximately 0.5, and the corresponding choking corrected mass flow being approximately 50% of the compressor maximum flow capacity. Both choking pressure ratio and flow are then shown to increase with corrected speed, and the choking pressure ratio is shown to occur at pressure ratios larger than unity for higher speeds. Simple empirical models are proposed and shown to be able to describe high flow and pressure ratios down to choking conditions well. A novel compressor flow model is proposed and validated to capture the high flow asymptote well, for speeds from standstill up to maximum.
Place, publisher, year, edition, pages
Sage Publications, 2016. Vol. 17, no 2, 153-168 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-92091DOI: 10.1177/1468087414562456ISI: 000368815100001OAI: oai:DiVA.org:liu-92091DiVA: diva2:620110
Funding agencies: Vinnova Industry Excellence Center: LINK-SIC Linkoping Center for Sensor Informatics and Control
Vid tiden för disputation förelåg publikationen endast som manuskript2013-05-072013-05-072016-02-23Bibliographically approved