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research-article

Influence of upstream exhaust manifold on pulsatile turbocharger turbine performance

[+] Author and Article Information
Shyang Maw Lim

Competence Center for Gas Exchange (CCGEx), Department of Mechanics, KTH Royal Institute of Technology, Osquars Backe 18, Stockholm 10044, 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:10.1115/1.4042301 History: Received November 21, 2018; Revised December 12, 2018

Abstract

This research was primary motivated by limited efforts to understand the effects of secondary flow and flow unsteadiness on the heat transfer and the performance of a turbocharger turbine subjected to pulsatile flow. In this study, we aimed to investigate the influence of exhaust manifold on the flow physics and the performance of its downstream components, including the effects on heat transfer, under engine-like pulsatile flow conditions. Based on the predicted results by Detached Eddy Simulation (DES), qualitative and quantitative flow fields analyses in the scroll and the rotor's inlet were performed, in addition to the quantification of turbine performance by using the flow exergy methodology. With the specified geometry configuration and exhaust valve strategy, our study showed that 1) The exhaust manifold influences the flow field and the heat transfer in the scroll significantly, and 2) Although the exhaust gas blow-down disturbs the relative flow angle at rotor inlet, the consequence on the turbine power is relatively small.

Copyright (c) 2018 by ASME
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