National Transport Library Research Database

Karakterisering av flöde, ljud och funktion av turboladdar kompressor vid instabila driftpunkter (Characterization and extension of stall and surge in turbocharger centrifugal compressor)

  • Kungliga tekniska högskolan, Universitet eller högskola, 202100-3054
Sponsors, duration, budget: Energimyndigheten ; 2011-01-01 -- 2014-12-31 ; 3640000 kronorRegistration number:
  • Energimyndigheten 2010004583
Subject(s): Abstract: Projektet ska genom detaljerad modellering och experimentella studier öka förståelsen för pumpningsfenomenet hos turboladdade kompressorer. Modeller och metoder kommer att utvecklas för hantering av bla. hysteres. Syftet är att resultaten skall kunna tillämpas på utvecklingen av framtida högeffektiva förbränningsmotorer. Abstract: The general aim of the project is to promote Internal-Combustion (IC) engine efficiency and thereby reducing CO2 emissions. Improved efficiency can be achieved by engine down-sizing, whereby (e.g. friction) losses can be reduced. By turbo-charging, which utilizes the energy in the exhaust gas the amount of air in the smaller engine can be increased. The project specific goals are to enhance the understanding of the flow and in particular stall and surge mechanism in the compressor, whereby the compressor efficiency can be maintained over a wider range of operation. Surge may occur with hysteresis and it may be caused by acoustical effects, stall (intermittent/time-dependent flow separation) or a combination of these. However, the exact mechanisms are unknown. The analysis proposed is based on LES with experimental support both from University of Cincinnati (using high-speed PIV, LDV and pressure gauges) and from KTH. More specifically, the project goals are; i) Analysis and understanding of the compressor behavior near/at surge, ii) Validate computational tools by comparing with experimental data. iii) Identify the dynamic evolution occurring in the compressor so as to be able to control/eliminate surge. iv) Develop the required computational tools for handling the hysteresis and the highly sensitive state of surge, given the uncertainty of inflow conditions and its variability.
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