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    Insights Into Turbocharger Centrifugal Compressor Stability Using High-Fidelity Computational Fluid Dynamics and a Novel Impeller Diffusion Factor

    Source: Journal of Turbomachinery:;2024:;volume( 147 ):;issue: 004::page 41003-1
    Author:
    Liu, Yiming
    ,
    Spence, Stephen
    ,
    Horsley, John
    ,
    Mann, Stuart
    ,
    Stuart, Charles
    DOI: 10.1115/1.4066742
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Turbocharger technologies are widely applied in the modern automotive industry to meet increasingly stringent carbon emission standards. To support the continuous enhancement of these tactics, delivering improvement to the performance and stability of turbocharger compressors at low mass flowrate regimes is of paramount importance. This chapter investigates the stability of a turbocharger compressor stage equipped with a ported shroud, using high-fidelity computational fluid dynamics (CFD) simulations. It was found that the recirculated flow passing through the ported shroud device had primary influence on the flow condition in the vicinity of the impeller tip region (80–100% span). This discovery facilitated the definition of a modified impeller diffusion factor (DF), which was applied to the CFD results for three different compressor geometry configurations to lead to the provision of quantitative metrics for impeller stability. Furthermore, the observed change in the limiting impeller DF along the compressor surge line indicated that the dominant components governing the instability of the entire stage had switched, i.e., the stalling behavior of the compressor stage had transitioned from impeller dominated stall to vaneless diffuser dominated stall. Additionally, the limiting impeller DF clearly showed that one of the compressor configurations with a change in the hub endwall recess around the rear of the impeller improved the impeller stability by 3%. By comparison, another configuration with a change to strut geometry in the ported shroud recirculation channel reduced the impeller stability by 10%. The present work addressed the gap in the understanding about the stability of different compressor configurations equipped with a ported shroud, and was useful for determining the changes in compressor global and local instability through a quantitative parameter based on a modified definition of DF.
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      Insights Into Turbocharger Centrifugal Compressor Stability Using High-Fidelity Computational Fluid Dynamics and a Novel Impeller Diffusion Factor

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    contributor authorLiu, Yiming
    contributor authorSpence, Stephen
    contributor authorHorsley, John
    contributor authorMann, Stuart
    contributor authorStuart, Charles
    date accessioned2025-04-21T10:34:36Z
    date available2025-04-21T10:34:36Z
    date copyright10/25/2024 12:00:00 AM
    date issued2024
    identifier issn0889-504X
    identifier otherturbo_147_4_041003.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4306476
    description abstractTurbocharger technologies are widely applied in the modern automotive industry to meet increasingly stringent carbon emission standards. To support the continuous enhancement of these tactics, delivering improvement to the performance and stability of turbocharger compressors at low mass flowrate regimes is of paramount importance. This chapter investigates the stability of a turbocharger compressor stage equipped with a ported shroud, using high-fidelity computational fluid dynamics (CFD) simulations. It was found that the recirculated flow passing through the ported shroud device had primary influence on the flow condition in the vicinity of the impeller tip region (80–100% span). This discovery facilitated the definition of a modified impeller diffusion factor (DF), which was applied to the CFD results for three different compressor geometry configurations to lead to the provision of quantitative metrics for impeller stability. Furthermore, the observed change in the limiting impeller DF along the compressor surge line indicated that the dominant components governing the instability of the entire stage had switched, i.e., the stalling behavior of the compressor stage had transitioned from impeller dominated stall to vaneless diffuser dominated stall. Additionally, the limiting impeller DF clearly showed that one of the compressor configurations with a change in the hub endwall recess around the rear of the impeller improved the impeller stability by 3%. By comparison, another configuration with a change to strut geometry in the ported shroud recirculation channel reduced the impeller stability by 10%. The present work addressed the gap in the understanding about the stability of different compressor configurations equipped with a ported shroud, and was useful for determining the changes in compressor global and local instability through a quantitative parameter based on a modified definition of DF.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleInsights Into Turbocharger Centrifugal Compressor Stability Using High-Fidelity Computational Fluid Dynamics and a Novel Impeller Diffusion Factor
    typeJournal Paper
    journal volume147
    journal issue4
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.4066742
    journal fristpage41003-1
    journal lastpage41003-11
    page11
    treeJournal of Turbomachinery:;2024:;volume( 147 ):;issue: 004
    contenttypeFulltext
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