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    Influence of Pulse Characteristics on Turbocharger Radial Turbine

    Source: Journal of Engineering for Gas Turbines and Power:;2021:;volume( 144 ):;issue: 002::page 21018-1
    Author:
    Mosca, Roberto
    ,
    Lim, Shyang Maw
    ,
    Mihaescu, Mihai
    DOI: 10.1115/1.4052498
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Turbocharging has been demonstrated as a key technology to enhance fuel efficiency in the automotive field that faces increasingly stringent emission regulations. Due to the reciprocating engine, pulsating flow feds the turbocharger turbine, which experiences conditions far from a continuous flow scenario. In this work, the effects of the characteristics of the mass flow pulse, parameterized through amplitude, frequency, and temporal gradient, are decoupled and studied via unsteady computational fluid dynamics calculations under on-engine operating conditions. First, the model is validated based on comparisons with experimental data in gas-stand conditions. Then, the effect of each parameter on the exergy budget is assessed by considering a ±10% variation with respect to a baseline pulse. The other factors defining the operating conditions (e.g., mass flow, shaft speed, and inflow exergy) are kept the same as the baseline. The adopted approach enables to completely isolate the effects of each parameter in contrast with previous literature studies. Based on the results observed, pulse amplitude is identified as the primary parameter affecting the hot-side system response in terms of turbine performance, heat transfer, and entropy generation, while frequency and temporal gradient show a smaller influence compared to it. As the pulse amplitude increases, the turbine work is reported to improve up to 9.4%. Smaller variations are otherwise observed for the frequency and temporal gradient analysis. With a 10% increase of the pulse frequency, the turbine work is registered to improve by 5.0%, while the same percentage reduction of the temporal gradient leads to an increase of the turbine work equal to 3.6%.
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      Influence of Pulse Characteristics on Turbocharger Radial Turbine

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4284944
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    contributor authorMosca, Roberto
    contributor authorLim, Shyang Maw
    contributor authorMihaescu, Mihai
    date accessioned2022-05-08T09:17:17Z
    date available2022-05-08T09:17:17Z
    date copyright12/3/2021 12:00:00 AM
    date issued2021
    identifier issn0742-4795
    identifier othergtp_144_02_021018.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4284944
    description abstractTurbocharging has been demonstrated as a key technology to enhance fuel efficiency in the automotive field that faces increasingly stringent emission regulations. Due to the reciprocating engine, pulsating flow feds the turbocharger turbine, which experiences conditions far from a continuous flow scenario. In this work, the effects of the characteristics of the mass flow pulse, parameterized through amplitude, frequency, and temporal gradient, are decoupled and studied via unsteady computational fluid dynamics calculations under on-engine operating conditions. First, the model is validated based on comparisons with experimental data in gas-stand conditions. Then, the effect of each parameter on the exergy budget is assessed by considering a ±10% variation with respect to a baseline pulse. The other factors defining the operating conditions (e.g., mass flow, shaft speed, and inflow exergy) are kept the same as the baseline. The adopted approach enables to completely isolate the effects of each parameter in contrast with previous literature studies. Based on the results observed, pulse amplitude is identified as the primary parameter affecting the hot-side system response in terms of turbine performance, heat transfer, and entropy generation, while frequency and temporal gradient show a smaller influence compared to it. As the pulse amplitude increases, the turbine work is reported to improve up to 9.4%. Smaller variations are otherwise observed for the frequency and temporal gradient analysis. With a 10% increase of the pulse frequency, the turbine work is registered to improve by 5.0%, while the same percentage reduction of the temporal gradient leads to an increase of the turbine work equal to 3.6%.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleInfluence of Pulse Characteristics on Turbocharger Radial Turbine
    typeJournal Paper
    journal volume144
    journal issue2
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4052498
    journal fristpage21018-1
    journal lastpage21018-10
    page10
    treeJournal of Engineering for Gas Turbines and Power:;2021:;volume( 144 ):;issue: 002
    contenttypeFulltext
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