Influence of Pulse Characteristics on Turbocharger Radial TurbineSource: Journal of Engineering for Gas Turbines and Power:;2021:;volume( 144 ):;issue: 002::page 21018-1DOI: 10.1115/1.4052498Publisher: 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%.
|
Show full item record
contributor author | Mosca, Roberto | |
contributor author | Lim, Shyang Maw | |
contributor author | Mihaescu, Mihai | |
date accessioned | 2022-05-08T09:17:17Z | |
date available | 2022-05-08T09:17:17Z | |
date copyright | 12/3/2021 12:00:00 AM | |
date issued | 2021 | |
identifier issn | 0742-4795 | |
identifier other | gtp_144_02_021018.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4284944 | |
description 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%. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Influence of Pulse Characteristics on Turbocharger Radial Turbine | |
type | Journal Paper | |
journal volume | 144 | |
journal issue | 2 | |
journal title | Journal of Engineering for Gas Turbines and Power | |
identifier doi | 10.1115/1.4052498 | |
journal fristpage | 21018-1 | |
journal lastpage | 21018-10 | |
page | 10 | |
tree | Journal of Engineering for Gas Turbines and Power:;2021:;volume( 144 ):;issue: 002 | |
contenttype | Fulltext |