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TECHNICAL PAPERS: Internal Combustion Engines

Multicode Prediction of the Influence of the Exhaust System on the Performance of a Turbocharged Engine

[+] Author and Article Information
G. Chiatti, O. Chiavola

Department of Mechanical and Industrial Engineering, University “Roma Tre,” Via della Vasca Navale, 79, 00146 Rome, Italy

J. Eng. Gas Turbines Power 124(3), 695-701 (Jun 19, 2002) (7 pages) doi:10.1115/1.1455640 History: Received July 01, 2000; Revised August 01, 2001; Online June 19, 2002
Copyright © 2002 by ASME
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References

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,” I. Mech. E., 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 Paper No. 900359.
Capobianco, M., and Gambarotta, A., 1993, “Performance of a Twin-Entry Automotive Turbocharger Turbine,” ASME Paper No. 93-ICE-2.
Yeo, J. H., and Baines, N. C., 1990, “Pulsating Flow Behavior in a Twin-Entry Vaneless Radial-Inflow Turbine,” I. Mech. E., Paper No. C405/004.
Capobianco, M., Gambarotta, A., and Zamboni, G., 1996, “Experimental Characterization of Turbocharging and EGR Systems in an Automotive Diesel Engine,” I. Mech. E., Paper No. C517/027.
Capobianco, M., Gambarotta, A., and Zamboni, G., 1998, “Controlling Turbocharging and EGR System to Improve Exhaust Aftertreatment Conditions in an Automotive Diesel Engine,” I. Mech. E., Paper No. C554/004.
Trenc,  F., Bizjan,  F., and Hribernik,  A., 1998, “Influence of the Exhaust System on Performance of a 4-Cylinder Supercharged Engine,” ASME J. Eng. Gas Turbines Power, 120, pp. 855–860.
Rakopoulos,  C. D., Andritsakis,  E. C., Hountalas,  D. T., 1995, “The Influence of the Exhaust System Unsteady Gas Flow and Insulation on the Performance of a Turbocharged Diesel Engine,” Heat Recovery Syst. CHP, 15, No. 1, pp. 51–72.
Onorati, A., Winterbone, D. E., and Pearson, R. J., 1993, “Comparison of the Lax-Wendroff Technique and the Method of Characteristics for Engine Gas Dynamic Calculations Using Fast Fourier Transform Spectra Analysis,” SAE Paper No. 930428.
Winterbone, D. E., Nikpour, B., and Frost, H., 1991, “A Contribution to the Understanding of Turbocharger Turbine Performance in Pulsating Flow,” I. Mech. E., Paper No. C433/011.
Benson, R. S., 1974, “Nonsteady Flow in a Turbocharger Nozzleless Radial Gas Turbine,” SAE Paper No. 740739.
Chen, H., and Winterbone, D. E., 1990, “A Method to Predict Performance of Vaneless Radial Turbines Under Steady and Unsteady Flow Conditions,” I. Mech. E., Paper No. C405/008.
Chiavola, O., 1999, “Sviluppo di modelli di simulazione delle prestazioni fluidodinamiche ed acustiche dei condotti di aspirazione e scarico di motori a combustione interna alternativi,” Ph.D. thesis, University ‘La Sapienza,’ Rome.
Chiatti, G., and Chiavola, O., 1999, “Exhaust Flow Modelling in Multi-cylinder Engine by Coupling 3D FIRE With 1D Gasdynamic Code,” CDF User Meeting, AVL LIST GmbH, Graz.
FIRE Manual, 1997, version 6.2.b, AVL LIST, GmbH Graz.
Chiatti, G., and Chiavola, O., 1999, “Integrated 3D and 1D Modelling of Ice Exhaust Systems Flow,” 5thInternational Conference on High Tech Cars and Engine, Modena.
Chiatti, G., and Chiavola, O., 1999, “Coupling 1D and 3D Gasdynamic Schemes to Model Engine Intake and Exhaust Systems,” ISABE XIV, Florence.
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Figures

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Scheme of the simulated exhaust system
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Pressure traces at location c of Figs. 4 – and 5 [[dotted_line]]
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Pressure and turbine isentropic specific enthalpy drop traces for constant pressure system in the basic configuration (–) and with a reduction of turbine inlet area ([[dotted_line]]), respectively
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Pressure and turbine isentropic specific enthalpy drop traces for two-pulse scheme (–) and constant pressure system ([[dotted_line]]), respectively
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Velocity traces at locations a – and b [[dotted_line]] (Fig. 4)
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Pressure traces at locations a – and b [[dotted_line]] (Fig. 5)
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Velocity traces at locations a – and b [[dotted_line]] (Fig. 5)
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Pressure traces at locations d –and e [[dotted_line]] (Fig. 5)
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Velocity traces at location c of Figs. 4 in the basic configuration (–) and with a reduction of turbine inlet area ([[dotted_line]]), respectively
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Velocity traces at location c of Figs. 5 in the basic configuration (–) and with a reduction of turbine inlet area ([[dotted_line]]), respectively
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Velocity field in the 2-branch junction during the discharge period of cylinder 4
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Velocity field in the 2-branch junction during the discharge period of cylinder 3
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Comparison between predicted and measured pressure histories at location a; engine speed 3140 rpm; computed [[long_dash_short_dash]], measured (20) –, computed (20) [[dotted_line]]
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Two-pulse exhaust system scheme
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Constant pressure exhaust system scheme
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Junction modeled as three-dimensional domain
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Pressure traces at locations a – and b [[dotted_line]] (Fig. 4)

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