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    • Simulation Study of the Performance of A Turbocharger Turbine Based on Integrated Structural Boundary
    DOI：10.13949/j.cnki.nrjgc.2023.06.002
    Key Words:exhaust system  exhaust manifold  turbocharger  separated structural boundary  integrated structural boundary
    Author NameAffiliationE-mail
    YIN Sheng College of Automotive Studies， Tongji University， Shanghai 201804， China 1811475@tongji.edu.cn 
    NI Jimin* College of Automotive Studies， Tongji University， Shanghai 201804， China nijimin@tongji.edu.cn 
    SHI Xiuyong College of Automotive Studies， Tongji University， Shanghai 201804， China shixy@tongji.edu.cn 
    HUANG Rong College of Automotive Studies， Tongji University， Shanghai 201804， China hr1209@tongji.edu.cn 
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    Abstract:Considering the actual exhaust system flow state， the exhaust manifold structure was added to the turbine performance simulation calculation （integrated structural boundary）. For separated structural boundary and integrated structural boundary， the same inlet conditions were set at different inlet cross-sections， and a turbine of a turbocharged gasoline engine was studied as an example. Study results show that at 80 000 r/min and the same steady admission， there was a significant difference between the flow states of the two structures at the turbine inlet cross-section. The flow uniformity index of the integrated structure boundary was 0.719， the expansion ratio decreased by 0.051， and the efficiency decreased by 3.73%. The performance of the integrated structure boundary decreased to different degrees at different speeds. The calculated results after the turbine MAP was corrected were closer to the actual engine condition.
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