This paper presents an investigation of the effects of ported shroud (PS) self-recirculating casing treatment used in turbocharger centrifugal compressors for increasing the operable range. The investigation consists of computing three-dimensional flow in a representative centrifugal compressor with and without PS at various levels of approximations in flow physics and geometrical configuration; this provides an enabler for establishing the causal link between PS flow effects and compressor performance changes. It is shown that the main flow path perceives the PS flow as a combination of flow actuations that include injection and removal of mass flow and injection of axial momentum and tangential momentum. A computational model in which the presence of the PS is replaced by imposed boundary conditions (BCs) that reflect the individual flow actuations has thus been formulated and implemented. The removal of a fraction of the inducer mass flow has been determined to be the dominant flow actuation in setting the performance of PS compressors. Mass flow removal reduces the flow blockage associated with the impeller tip leakage flow and increases the diffusion in the main flow path. Adding swirl to the injected flow in the direction opposite to the wheel rotation results in an increase of the stagnation pressure ratio and a decrease of the efficiency. The loss generation in the flow path has been defined to rationalize efficiency changes associated with PS compressor operation.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Characterizing Flow Effects of Ported Shroud Casing Treatment on Centrifugal Compressor Performance



    Published in:

    Publication date :

    2017




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    52.30 / 52.30 Strömungskraftmaschinen, Turbomaschinen




    The Effect of Ported Shroud Recirculating Casing Treatment on Turbocharger Centrifugal Compressor Acoustics

    Selamet, Ahmet / Karim, Ahsanul / Miazgowicz, Keith et al. | SAE Technical Papers | 2017


    Numerical Flow Analysis of a Centrifugal Compressor with Ported and without Ported Shroud

    Semlitsch, Bernhard / Gutmark, Ephraim / V, JyothishKumar et al. | SAE Technical Papers | 2014


    Dynamic Characterization of a Centrifugal Compressor with Ported Shroud

    Gancedo, Matthieu / Guillou, Erwann / DiMicco, Russell et al. | AIAA | 2011


    DYNAMIC CHARACTERIZATION OF A CENTRIFUGAL COMPRESSOR WITH PORTED SHROUD

    Gancedo, M. / Guillou, E. / Dimicco, R. et al. | British Library Conference Proceedings | 2011