Research Papers: Gas Turbines: Turbomachinery

On the Design and Matching of Turbocharger Single Scroll Turbines for Pass Car Gasoline Engines

[+] Author and Article Information
Marc Gugau

BorgWarner Turbo Systems Engineering GmbH,
Marnheimer Straße 85/87,
Kirchheimbolanden 67292, Germany
e-mail: mgugau@borgwarner.com

Harald Roclawski

Department of Mechanical Engineering,
Institute of Fluid Mechanics
and Turbomachinery,
Technical University of Kaiserslautern,
Gottlieb Daimler Straße,
Kaiserslautern 67661, Germany
e-mail: roclawsk@mv.uni-kl.de

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 25, 2014; final manuscript received May 11, 2014; published online June 27, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(12), 122602 (Jun 27, 2014) (10 pages) Paper No: GTP-14-1165; doi: 10.1115/1.4027710 History: Received March 25, 2014; Revised May 11, 2014

With emission legislation becoming more stringent within the next years, almost all future internal combustion gasoline engines need to reduce specific fuel consumption, most of them by using turbochargers. Additionally, car manufactures attach high importance to a good drivability, which usually is being quantified as a target torque already available at low engine speeds—reached in transient response operation as fast as possible. These engine requirements result in a challenging turbocharger compressor and turbine design task, since for both not one single operating point needs to be aerodynamically optimized but the components have to provide for the optimum overall compromise for maximum thermodynamic performance. The component design targets are closely related and actually controlled by the matching procedure that fits turbine and compressor to the engine. Inaccuracies in matching a turbine to the engine full load are largely due to the pulsating engine flow characteristic and arise from the necessity of arbitrary turbine map extrapolation toward low turbine blade speed ratios and the deficient estimation of turbine efficiency for low engine speed operating points. This paper addresses the above described standard problems, presenting a methodology that covers almost all aspects of thermodynamic turbine design based on a comparison of radial and mixed-flow turbines. Wheel geometry definition with respect to contrary design objectives is done using computational fluid dynamics (CFD), finite element analysis (FEA), and optimization software. Parametrical turbine models, composed of wheel, volute, and standard piping allow for fast map calculation similar to steady hot gas tests but covering the complete range of engine pulsating mass flow. These extended turbine maps are then used for a particular assessment of turbine power output under unsteady flow admission resulting in an improved steady-state matching quality. Additionally, the effect of various design parameters like either volute sizing or the choice of compressor to turbine diameter ratio on turbine blade speed ratio operating range as well as well as turbine inertia effect is analyzed. Finally, this method enables the designer to comparatively evaluate the ability of a turbine design to accelerate the turbocharger speed for transient engine response while still offering a map characteristic that keeps fuel consumption low at all engine speeds.

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Bormann, D., Pingen, B., Müller, B., Kelly, P., Küpper, K., and Wirth, M., 2009, “Der Antriebsstrang mit Einem Kleinen Down-Sizingmotor—Auslegungsstrategien und Systemkomponenten,” 30th Internationale Wiener Motorensymposium, Vienna, May 7–8.
Sonner, M., Wurms, R., Heiduk, T., and Eiser, A., 2010, “Unterschiedliche Bewertung von Zukünftigen Aufladekonzepten am Stationären Motorprüfstand und im Fahrzeug,” 15th Aufladetechnische Konferenz, Dresden, September 23–24.
Hagelstein, D., Hentschel, L., Strobel, S., Szengel, R., Theobald, J., and Middendorf, H., 2009, “Die Aufladeentwicklung für den Neuen 1.2l TSi Motor von Volkswagen,” 14th Aufladetechnische Konferenz, Dresden, September 24–25.
Baines, N. C., 2005, Fundamentals of Turbocharging, Concepts ETI, Edwards Brothers Inc., Ann Arbor, MI.
Japikse, D., and Baines, N. C., 1994, Introduction to Turbomachinery, Concepts ETI, Oxford University Press, Oxford.
Wallace, F. J., 1971, “A Systematic Approach to the Design of Radial Inflow and Mixed Flow Turbines,” NACA Report No. RM E51H06.
Rajoo, S., and Martinez-Botas, R., 2008, “Mixed Flow Turbine Research: A Review,” ASME J. Turbomach., 130(4), p. 044001. [CrossRef]
Baines, N. C., 2010, “Turbocharger Turbine Pulse Flow Performance and Modelling 25 Years On,” 9th IMechE International Confererce on Turbochargers and Turbocharging, London, May 19–20, pp. 347–362. [CrossRef]
Hiereth, H., and Prenninger, P., 2003, Aufladung der Verbrennungs-kraftmaschine, Springer-Verlag, Austria.
Naundorf, D., Bolz, H., and Mandel, M., 2001, “Design and Implementation of a New Generation of Turbo Charger Test Benches Using Hot Gas Technology,” SAE Technical Paper No. 2001-01-0279. [CrossRef]
Engels, B., 1990, “Verbesserung des Instationärverhaltens von Abgasturboladern,” Technische Akademie Wuppertal, Wuppertal, Germany.
Scharf, J., Schorn, N., Smiljanovski, V., Uhlmann, T., and Aymanns, R., 2010, “Methods for Extended Turbocharger Mapping and Turbocharger Assessment,” 15th Aufladetechnische Konferenz, Dresden, September 23–24.
Marelli, S., and Capobianco, M., 2011, “Steady and Pulsating Flow Efficiency of a Waste-Gated Turbocharger Radial Flow Turbine for Automotive Application,” Energy, 36(1), pp. 459–465. [CrossRef]
Reuter, S., Koch, A., and Kaufmann, A., 2010, “Extension of Performance Maps of Radial Turbocharger Turbines Using Pulsating Hot Gas Flow,” 9th International Conference on Turbochargers and Turbocharging, London, May 19–20, pp. 263–280.
Suhrmann, J., Peitsch, D., Gugau, M., Heuer, T., and Tomm, U., 2010, “Validation and Development of Loss Models for Small Size Radial Turbines,” ASME Paper No. GT2010-22666. [CrossRef]
Roclawski, H., and Gugau, M., 2012, “Multidisciplinary Design Optimization of a Mixed Flow Turbine Wheel,” ASME Paper No. GT2012-68233. [CrossRef]
Uhlmann, T., and Pischinger, S., 2012, “Erweiterte Turbinenkennfeld-Messung,” FVV Herbsttagung 2012, Dortmund, Germany, September 27–28. FVV-Forschungsvorhaben Nr. 1038.
Smiljanovski, V., Schorn, N., Scharf, J., Funken, B., and Pischinger, S., 2008, “Messung des Turbinenwirkungsgrades bei niedrigen Turboladerdrehzahlen,” 13th Aufladetechnische Konferenz, Dresden, September 25–26.


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Fig. 1

Steady-state engine targets: (a) engine performance and (b) p3 and fuel consumption (“BSFC”)

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Fig. 2

Unsteady turbine inflow: (a) pulsating flow character and (b) pulse coefficient

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Fig. 3

CFD-model for map generation

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Fig. 4

Flow parameter map

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Fig. 5

Combined efficiency map

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Fig. 6

Turbine maps for different designs RFT/MFT at tip speed = 280 m/s; (a) FP and (b) efficiency

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Fig. 7

Change of turbine properties with diameter

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Fig. 8

Turbine efficiency maps at 1500

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Fig. 9

Engine pulse at 1500 and turbine work range

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Fig. 10

Turbine efficiency maps at 5000

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Fig. 11

Engine pulse at 5000 and turbine work range

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Fig. 12

Turbine efficiency work maps and power generation at 1500

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Fig. 13

Turbine efficiency work maps and power generation at 5000

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Fig. 14

Flow parameter of four test turbines

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Fig. 15

Design properties of test turbines

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Fig. 16

Combined efficiency of four test turbines

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Fig. 17

Power output and pulse C of four test turbines

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Fig. 18

Power and pressure p3 of four test turbines

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Fig. 19

Results for four test turbines: (a) acceleration and (b) mean efficiency



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