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Flow phenomena leading to surge in a centrifugal compressor
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).ORCID-id: 0000-0001-7330-6965
2016 (Engelska)Ingår i: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 103, s. 572-587Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Surge is a global flow instability occurring in centrifugal compressors at low mass-flow rate operation. Due to its violent nature, it is the limiting factor for operability. To enhance the operating range, understanding of the flow instability inception when approaching surge is essential. Therefore, the flow evolution along a speed line is analysed by performing unsteady, three-dimensional flow simulations using a centrifugal compressor geometry with ported shroud. A stable operating condition, at high mass-flow rates, is compared to lower mass-flow rate operating conditions close to and at surge. The particularities of the flow-fields are analysed and described. A smooth flow-field is observed for the stable operating condition, whereas flow reversal manifesting as tip leakage at the outer periphery of the impeller occurs for all off-design operating conditions. The reversed flow exhibits swirling motion in the impeller rotation direction. This induces a globally swirling flow upstream of the impeller, which influences the flow incidence angles at the blades and hence, their efficiency. Proper orthogonal decomposition and dynamic mode decomposition have been performed to analyse the flow structures appearing with surge more thoroughly. For the lowest mass-flow rate operating condition, low frequency modes describing the filling and emptying processes during surge have been found.

Ort, förlag, år, upplaga, sidor
Elsevier, 2016. Vol. 103, s. 572-587
Nyckelord [en]
Large eddy simulation, Compressor Flows, Flow decomposition methods, Turbocharged engines, Turbomachinery
Nationell ämneskategori
Energiteknik
Forskningsämne
Teknisk mekanik
Identifikatorer
URN: urn:nbn:se:kth:diva-217353DOI: 10.1016/j.energy.2016.03.032ISI: 000376800200048Scopus ID: 2-s2.0-84961644406OAI: oai:DiVA.org:kth-217353DiVA, id: diva2:1155869
Forskningsfinansiär
Energimyndigheten
Anmärkning

QC 20171110

Tillgänglig från: 2017-11-09 Skapad: 2017-11-09 Senast uppdaterad: 2017-11-10Bibliografiskt granskad

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Semlitsch, BernhardMihaescu, Mihai
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MekanikLinné Flow Center, FLOWCompetence Center for Gas Exchange (CCGEx)
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