Karakterisering av flöde, ljud och funktion av turboladdar kompressor vid instabila driftpunkter

Characterization and extension of stall and surge in turbocharger centrifugal compressor

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.

    Language

    • Swedish

    Project

    • Sponsor Organizations:

      Energimyndigheten

      Eskilstuna,   Sweden 
    • Performing Organizations:

      KTH Royal Institute of Technology, Sweden

      Stockholm,   Sweden  SE-100 44
    • Start Date: 20110101
    • Expected Completion Date: 20141231
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01517770
    • Record Type: Research project
    • Source Agency: Swedish National Road and Transport Research Institute (VTI)
    • Files: ITRD, VTI
    • Created Date: Mar 10 2014 1:24PM