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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

Karamanis, N., 2000, “Inlet and exit flow characteristics of mixed flow turbines in advanced automotive turbocharging,” Ph.D. thesis, Imperial College of Science, Technology and Medicine, London, England.
Dale, A., Watson, N., 1986, “Vaneless Radial Turbocharger Turbine Performance,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., Proceedings of IMechE C110/86.
Winterbone, D. E., Nikpour, B., and Alexander, G. I., 1990, “Measurement of the Performance of a Radial Inflow Turbine in Conditional Steady and Unsteady Flow,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., Proceedings of IMechE C405/015.
Winterbone, D. E., Nikpour, B., and Frost, H., 1991, “A Contribution to the Understanding of Turbocharger Turbine Performance in Pulsating Flow,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., Paper: C433/011.
Hakeem, I., 1995, “Steady and unsteady performance of mixed flow turbines for automotive turbochargers,” Ph.D. thesis, Imperial College of Science, Technology and Medicine, London, England.
Su, C. C., 1999, “Flow characteristics and performance of mixed flow turbines,” Ph.D. Thesis, Imperial College of Science, Technology and Medicine, London, England.
Karamanis,  N., Martinez-Botas,  R. F., and Su,  C. C., 2000, “Performance and Detailed Flow Measurements at the Inlet and Exit of a Mixed Flow Turbine Under Steady and Pulsating Flow Conditions,” ASME J. Turbomach., 123, pp. 359–371.
Wallace, F. J., and Blair, G. P., 1965, “The Pulsating-Flow Performance of Inward Radial-Flow Turbines,” Gas Turbine Power Division, ASME 65-GTP-21.
Kosuge, H., Yamanaka, N., Ariga, I., and Watanabe, I., 1976, “Performance of Radial Flow Turbines Under Pulsating Flow Conditions,” ASME J. Turbomach., Paper no. 75-GT-30.
Winterbone,  D. E., and Pearson,  R. J., 1998, “Turbocharger Turbine Performance Under Unsteady Flow–A Review of Experimental Results and Proposed Models, Sixth International Conference on Turbocharging and Air Management Systems,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., 1998-11, C554/031/98.
Baines, N. C., Hajilouy-Benisi, A., and Yeo, J. H., 1994, “The Pulse Flow Performance and Modelling of Radial Inflow Turbines,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., Paper no. C484/006/94.
Capobianco, M., Gambarotta, A., and Cipolla, G., 1989, “Influence of the Pulsating Flow Operation on the Turbine Characteristics of a Small Internal Combustion Engine Turbocharger,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., Paper no. C372/019.
Capobianco, M., Gambarotta, A., and Cipolla, G., 1990, “Effect of Inlet Pulsating Pressure Characteristics on Turbine Performance of an Automotive Wastegated Turbocharger,” SAE International Congress and Exposition, Detroit, Michigan, Paper no. 900359.
Capobianco, M., and Gambarotta, A., 1990, “Unsteady Flow Performance of Turbocharger Radial Turbines,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., Proceedings of IMechE C405/017.
Yeo, J. H., and Baines, N. C., 1990, “Pulsating Flow Behavior of a Twin-Entry Vaneless Radial-Flow Turbine,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., Proceedings of IMechE C405/004.
Wallace,  F. J. , 1970, “Performance of Inward Radial Flow Turbines Under Non-Steady Flow Conditions,” Proc. Inst. Mech. Eng., 184.
Chen, H., and Winterbone, D. E., 1990, “A Method to Predict Performance of Vaneless Radial Turbines Under Steady and Unsteady Flow Conditions,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., Proceedings of IMechE C405/008.
Connor, W. A., and Swain, E., 1994, “Extension of the Filling and Emptying Engine Performance Simulation Method to Include Gas Dynamic Effects,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., paper no. C484/042/94.
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Chen,  H., Hakeem,  I., and Martinez-Botas,  R. F., 1996, “Modelling of a Turbocharger Turbine Under Pulsating Inlet Conditions,” Proc. Inst. Mech. Eng., 210.
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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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