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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

Figures

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Scheme of the simulated exhaust system
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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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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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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 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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