A Numerical Study of Inlet Geometry for a Low Inertia Mixed Flow Turbocharger Turbine

Thomas M. Leonard, Stephen Spence, Juliana Early, Dietmar Filsinger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Mixed flow turbines can offer improvements over typical radial turbines used in automotive turbochargers, with regards to transient performance and low velocity ratio efficiency. Turbine rotor mass dominates the rotating inertia of the turbocharger, and any reductions of mass in the outer radii of the wheel, including the rotor back-disk, can significantly reduce this inertia and improve the acceleration of the assembly. Off-design, low velocity ratio conditions are typified by highly tangential flow at the rotor inlet and a non-zero inlet blade angle is preferred for such operating conditions. This is achievable in a Mixed Flow Turbine without increasing bending stresses within the rotor blade, which is beneficial in high speed and high inlet temperature turbine design. A range of mixed flow turbine rotors was designed with varying cone angle and inlet blade angle and each was assessed at a number of operating points. These rotors were based on an existing radial flow turbine, and both the hub and shroud contours and exducer geometry were maintained. The inertia of each rotor was also considered. The results indicated that there was a trade-off between efficiency and inertia for the rotors and certain designs may be beneficial for the transient performance of downsized, turbocharged engines.
Original languageEnglish
Title of host publicationProceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
PublisherThe American Society of Mechanical Engineers (ASME)
Pages1-11
Number of pages11
ISBN (Print)978-0-7918-4563-9
DOIs
Publication statusPublished - Jun 2014
EventProceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition - Dusseldorf, Germany
Duration: 09 Jun 201416 Jun 2014

Conference

ConferenceProceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
CountryGermany
CityDusseldorf
Period09/06/201416/06/2014

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