Unsteady Performance of a Double- Entry Turbocharger Turbine with Comparison to Steady-Flow Conditions

CD Copeland, R. M. Martinez-Botas, M. Seiler

Research output: Contribution to journalArticle (Academic Journal)peer-review

42 Citations (Scopus)

Abstract

Circumferentially divided, double entry turbocharger turbines are designed with a dividing wall parallel to the machine axis such that each entry feeds a separate 180 deg section of the nozzle circumference prior to entry into the rotor. This allows the exhaust pulses originating from the internal combustion exhaust to be preserved. Since the turbine is fed by two separate unsteady flows, the phase difference between the exhaust pulses entering the turbine rotor will produce a momentary imbalance in the flow conditions around the periphery of the turbine rotor. This research seeks to provide new insight into the impact of unsteadiness on turbine performance. The discrepancy between the pulsed flow behavior and that predicted by a typical steady flow performance map is a central issue considered in this work. In order to assess the performance deficit attributable to unequal admission, the steady flow conditions introduced in one inlet were varied with respect to the other. The results from these tests were then compared with unsteady, in-phase and out-of-phase pulsed flows most representative of the actual engine operating condition.
Translated title of the contributionUnsteady Performance of a Double- Entry Turbocharger Turbine with Comparison to Steady-Flow Conditions
Original languageEnglish
Pages (from-to)021022 - 021032
Number of pages10
JournalJournal of Turbomachinery
Volume134
DOIs
Publication statusPublished - Mar 2012

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