Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines 2017
DOI: 10.1115/gt2017-64190
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3-D Computational Loss Analysis of an Asymmetric Volute Twin-Scroll Turbocharger

Abstract: In times of stringent emission standards for automotive and truck applications, exhaust gas recirculation (EGR) is used in IC engines to reduce NOx emissions by recirculating a portion of an engine’s exhaust gas. The amount of exhaust gas determined for EGR is withdrawn from the exhaust gas route and routed back into the combustion chamber. The recirculated exhaust gas acts as an inert gas and, when mixed with the pre-combustion mixture, helps to decrease the combustion temperature and thus NOx emissions. … Show more

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Cited by 18 publications
(7 citation statements)
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“…The same deviation was also documented in [17]. Through a literature study of [18][19][20][21][22], the maximum deviation of MFT between CFD results and test data was found within the range of 2-6%. As the current deviation fell within that range, the literature study added confidence to the current CFD method.…”
Section: Cfd Modeling Methods and Validationsupporting
confidence: 68%
“…The same deviation was also documented in [17]. Through a literature study of [18][19][20][21][22], the maximum deviation of MFT between CFD results and test data was found within the range of 2-6%. As the current deviation fell within that range, the literature study added confidence to the current CFD method.…”
Section: Cfd Modeling Methods and Validationsupporting
confidence: 68%
“…All of the studies mentioned in the introduction (see [5,6,7,8]) have in common, that very fine grids are necessary to capture the entropy production correctly. This is due to the fact, that the entropy production rates are based on the product of velocity gradients, which implies that a small error in the predicted velocity leads to a large error in predicted entropy generation (see Herwig and Wenterodt [27] for a more detailed discussion).…”
Section: Verificationmentioning
confidence: 99%
“…In these studies, it is demonstrated that calculated entropy maps provide valuable information to assess the impact of different flow path designs on the entropy generation and therefore can be helpful for the reduction of losses. This concept has been also applied in other studies, e. g. by Zlatinov et al [7], who investigated the loss generation mechanisms due to purge air injection in axial turbines, and Palenschat et al [8], who quantified and categorized the losses occurring in a twin-scroll turbocharger.…”
Section: Introductionmentioning
confidence: 99%
“…Experimental and numerical investigations have been carried out on the performance and flow field of the twin-entry turbine at steady conditions [4][5][6][7][8]. The swallowing capacity and efficiency are dramatically different between the full admission and unequal admissions.…”
Section: Introductionmentioning
confidence: 99%