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research-article

Aerothermodynamics and exergy analysis in radial turbine with heat transfer

[+] Author and Article Information
Shyang Maw Lim

Competence Center for Gas Exchange (CCGEx), Department of Mechanics, KTH Royal Institute of Technology, Teknikringen 8, 11428 Stockholm, Sweden
smlim@kth.se

Anders Dahlkild

Linné Flow Center (FLOW), Department of Mechanics, KTH Royal Institute of Technology, Osquars Backe 18, Stockholm 10044, Sweden
ad@mech.kth.se

Mihai Mihaescu

Competence Center for Gas Exchange (CCGEx) & Linné Flow Center (FLOW), Department of Mechanics, KTH Royal Institute of Technology, Osquars Backe 18, Stockholm 10044, Sweden
mihai@mech.kth.se

1Corresponding author.

ASME doi:10.1115/1.4040852 History: Received September 28, 2017; Revised July 09, 2018

Abstract

This study was motivated by inconsistent results in literature about heat transfer effect on the performance of turbocharger turbine, and by the lack of understanding about the physical mechanisms associated with heat transfer. In this study, we aimed to investigate the sensitivity of performance to heat loss, to quantify the aerothermodynamic mechanisms associated with heat transfer and to study the available energy utilization by a turbocharger turbine. Exergy analysis was performed based on the predicted three-dimensional flow field by Detached Eddy Simulation (DES). The scope of this study was limited to a turbocharger turbine operating under hot gas stand steady and continuous flow condition. Principal results of our study showed that at a specfied mass flow rate, 1) Pressure ratio drop is less sensitive to heat loss as compared to turbine power reduction, 2) Turbine power drop due to heat loss is relatively insignificant as compared to the exergy lost via heat transfer and thermal irreversibilities, and 3) A turbine is not an effective machine to harvest all the available exhaust energy in the system even if the turbine is working under the ideal isentropic gas expansion.

Copyright (c) 2018 by ASME
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