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TECHNICAL PAPERS

The Pulsating Flow Field in a Mixed Flow Turbocharger Turbine: An Experimental and Computational Study

[+] Author and Article Information
D. Palfreyman

CD adapco Group, 200 Shepherds Bush Road, Hammersmith, London, UK

R. F. Martinez-Botas

Mechanical Engineering Department, Imperial College, London, UK

J. Turbomach 127(1), 144-155 (Feb 09, 2005) (12 pages) doi:10.1115/1.1812322 History: Received October 01, 2003; Revised March 01, 2004; Online February 09, 2005
Copyright © 2005 by ASME
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References

Figures

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Experimental data from a simulated turbocharger rig; Karamanis 1 (a) Inlet pressure; Karamanis 1. (b) Inlet mass flow rate; Karamanis 1.
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Mixed flow turbine and single entry nozzle-less volute geometry, see Table 2 for dimensions
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Mesh of turbine wheel and complete assembly
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Inlet, exit and sliding boundary planes
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Torque trace over two pulses periods
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Pressure at the center of the volute at given azimuth angles. (a) Experiment 1. (b) Predicted.
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Turbine performance maps. (a) Instantaneous ηt−s versus Pr; experimental data 1. (b) Instantaneous MFR versus Pr; experimental data 1.
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Experimental and numerical torque data. (a)—Total turbine torque, experiment 1. (b)—Torque on blades 01 and 07.
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Turbine work, showing isentropic and actual work
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Tangential velocity at the center of the volute, for two azimuth angles. (a) Experiment 1. (b) Predicted.
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Velocity at the inlet to the turbine, shown for azimuth angle 40 deg. (a) Experiment 1. (b) Predicted.
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Stage pressure at position “1” (left) and “2” during the pulse; see Fig. 13
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Pressure distribution at given locations within the turbine stage
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Mass flow rate at the stage inlet and exit
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Blade 01 pressure loading against chord for two locations during the pulse; see Fig. 13. (a) Position 01 (0.00572 s). (b) Position 02 (0.01955 s).
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Velocity and flow angles at the inlet to the turbine, at 40 deg azimuth angle. (a) Velocity. (b) Flow angles.
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Velocity components within the inducer portion of the turbine passage between blades 1 and 2, at mid span and pitch
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Velocity components within the exducer portion of the turbine passage between blades 1 and 2, at mid span and pitch
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Velocity and flow angles at the exit of the turbine, at 40 deg azimuth angle (a) Velocity. (b) Flow angles.
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Contour plots of velocity (relative) in the inducer for two positions during the pulse; see Fig. 13. (a) Position 01 (0.00572 s). (b) Position 02 (0.01955 s).
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Contour plots of velocity (relative) in the exducer for two positions during the pulse; see Fig. 13. (a) Position 01 (0.00572 s). (b) Position 02 (0.01955 s).
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Orientation perpendicular to the dotted lines

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