Potentials of Variable Cross Section Compressor Regarding Surge Line and Compressor Efficiency Using Engine Test Bench Measurements and Engine Process Simulation

Research output: Contribution to journalConference articleResearchpeer review

Authors

  • Jan Flinte
  • Thorsten Sextro
  • Peter Eilts
  • Joerg Seume

External Research Organisations

  • Technische Universität Braunschweig
View graph of relations

Details

Original languageEnglish
JournalSAE Technical Papers
Volume2018-May
Issue numberMay
Publication statusPublished - 30 May 2018
Event2nd CO2 Reduction for Transportation Systems Conference, CO2 2018 - Turin, Italy
Duration: 6 Jun 20188 Jun 2018

Abstract

Downsizing of SI engines in combination with turbocharging is state of the art to reach future CO2 emission limits. A single stage turbocharged engine has a conflict of objectives between high rated power and high low-end-torque. To expand the stable map area of the compressor a variable compressor is investigated on an engine test bench supported by the use of engine process simulation. The measurements were carried out on a radial compressor with high trim compressor wheel. The limiting factor of the feasible low end torque is the surge line. Different inlet cross sections are investigated to shift the surge line to lower mass flow. The compressor maps are measured simultaneously on a hot gas and an engine test bench. A combination of both maps provides the input data for a 1D-simulation model of the test engine, which is presented in this paper. A predictive combustion model is validated for full and part load operating points up to 5000 rpm based on the serial production engine. Because a diesel VTG is used with the variable cross section compressor the measuring range is limited to 4000 rpm due to limitations in exhaust temperature. The potential of operating at higher temperatures before turbine is evaluated using the simulation model. The investigations show high potential using variable inlet cross section to expand the stable operating area of the compressor. The peak efficiency of the compressor can be shifted depending on the operating point of the engine using the variable inlet cross section. Further the test engine is using scavenging to provide high engine torque at low engine speeds, which has a negative impact on CO2 emissions. The variable cross section compressor enables the engine to provide the same peak torque at the same speed without valve overlap.

ASJC Scopus subject areas

Cite this

Potentials of Variable Cross Section Compressor Regarding Surge Line and Compressor Efficiency Using Engine Test Bench Measurements and Engine Process Simulation. / Flinte, Jan; Sextro, Thorsten; Eilts, Peter et al.
In: SAE Technical Papers, Vol. 2018-May, No. May, 30.05.2018.

Research output: Contribution to journalConference articleResearchpeer review

Flinte J, Sextro T, Eilts P, Seume J. Potentials of Variable Cross Section Compressor Regarding Surge Line and Compressor Efficiency Using Engine Test Bench Measurements and Engine Process Simulation. SAE Technical Papers. 2018 May 30;2018-May(May). doi: 10.4271/2018-37-0004
Flinte, Jan ; Sextro, Thorsten ; Eilts, Peter et al. / Potentials of Variable Cross Section Compressor Regarding Surge Line and Compressor Efficiency Using Engine Test Bench Measurements and Engine Process Simulation. In: SAE Technical Papers. 2018 ; Vol. 2018-May, No. May.
Download
@article{b346dc01f4a74c4c9ef8ab4692b2db2a,
title = "Potentials of Variable Cross Section Compressor Regarding Surge Line and Compressor Efficiency Using Engine Test Bench Measurements and Engine Process Simulation",
abstract = "Downsizing of SI engines in combination with turbocharging is state of the art to reach future CO2 emission limits. A single stage turbocharged engine has a conflict of objectives between high rated power and high low-end-torque. To expand the stable map area of the compressor a variable compressor is investigated on an engine test bench supported by the use of engine process simulation. The measurements were carried out on a radial compressor with high trim compressor wheel. The limiting factor of the feasible low end torque is the surge line. Different inlet cross sections are investigated to shift the surge line to lower mass flow. The compressor maps are measured simultaneously on a hot gas and an engine test bench. A combination of both maps provides the input data for a 1D-simulation model of the test engine, which is presented in this paper. A predictive combustion model is validated for full and part load operating points up to 5000 rpm based on the serial production engine. Because a diesel VTG is used with the variable cross section compressor the measuring range is limited to 4000 rpm due to limitations in exhaust temperature. The potential of operating at higher temperatures before turbine is evaluated using the simulation model. The investigations show high potential using variable inlet cross section to expand the stable operating area of the compressor. The peak efficiency of the compressor can be shifted depending on the operating point of the engine using the variable inlet cross section. Further the test engine is using scavenging to provide high engine torque at low engine speeds, which has a negative impact on CO2 emissions. The variable cross section compressor enables the engine to provide the same peak torque at the same speed without valve overlap.",
author = "Jan Flinte and Thorsten Sextro and Peter Eilts and Joerg Seume",
note = "Funding information: The investigations presented in this paper are carried out as part of a research project funded by the Research association for Combustion Engines (FVV, Frankfurt am Main, Germany). The authors thank the FVV and the Federal Ministry for Economic Affairs and Energy (BMWi) which financially supported the work via the German Federation of Industrial Research Associations (AiF), (IGF-No. 18572 N / 2).; 2nd CO2 Reduction for Transportation Systems Conference, CO2 2018 ; Conference date: 06-06-2018 Through 08-06-2018",
year = "2018",
month = may,
day = "30",
doi = "10.4271/2018-37-0004",
language = "English",
volume = "2018-May",
number = "May",

}

Download

TY - JOUR

T1 - Potentials of Variable Cross Section Compressor Regarding Surge Line and Compressor Efficiency Using Engine Test Bench Measurements and Engine Process Simulation

AU - Flinte, Jan

AU - Sextro, Thorsten

AU - Eilts, Peter

AU - Seume, Joerg

N1 - Funding information: The investigations presented in this paper are carried out as part of a research project funded by the Research association for Combustion Engines (FVV, Frankfurt am Main, Germany). The authors thank the FVV and the Federal Ministry for Economic Affairs and Energy (BMWi) which financially supported the work via the German Federation of Industrial Research Associations (AiF), (IGF-No. 18572 N / 2).

PY - 2018/5/30

Y1 - 2018/5/30

N2 - Downsizing of SI engines in combination with turbocharging is state of the art to reach future CO2 emission limits. A single stage turbocharged engine has a conflict of objectives between high rated power and high low-end-torque. To expand the stable map area of the compressor a variable compressor is investigated on an engine test bench supported by the use of engine process simulation. The measurements were carried out on a radial compressor with high trim compressor wheel. The limiting factor of the feasible low end torque is the surge line. Different inlet cross sections are investigated to shift the surge line to lower mass flow. The compressor maps are measured simultaneously on a hot gas and an engine test bench. A combination of both maps provides the input data for a 1D-simulation model of the test engine, which is presented in this paper. A predictive combustion model is validated for full and part load operating points up to 5000 rpm based on the serial production engine. Because a diesel VTG is used with the variable cross section compressor the measuring range is limited to 4000 rpm due to limitations in exhaust temperature. The potential of operating at higher temperatures before turbine is evaluated using the simulation model. The investigations show high potential using variable inlet cross section to expand the stable operating area of the compressor. The peak efficiency of the compressor can be shifted depending on the operating point of the engine using the variable inlet cross section. Further the test engine is using scavenging to provide high engine torque at low engine speeds, which has a negative impact on CO2 emissions. The variable cross section compressor enables the engine to provide the same peak torque at the same speed without valve overlap.

AB - Downsizing of SI engines in combination with turbocharging is state of the art to reach future CO2 emission limits. A single stage turbocharged engine has a conflict of objectives between high rated power and high low-end-torque. To expand the stable map area of the compressor a variable compressor is investigated on an engine test bench supported by the use of engine process simulation. The measurements were carried out on a radial compressor with high trim compressor wheel. The limiting factor of the feasible low end torque is the surge line. Different inlet cross sections are investigated to shift the surge line to lower mass flow. The compressor maps are measured simultaneously on a hot gas and an engine test bench. A combination of both maps provides the input data for a 1D-simulation model of the test engine, which is presented in this paper. A predictive combustion model is validated for full and part load operating points up to 5000 rpm based on the serial production engine. Because a diesel VTG is used with the variable cross section compressor the measuring range is limited to 4000 rpm due to limitations in exhaust temperature. The potential of operating at higher temperatures before turbine is evaluated using the simulation model. The investigations show high potential using variable inlet cross section to expand the stable operating area of the compressor. The peak efficiency of the compressor can be shifted depending on the operating point of the engine using the variable inlet cross section. Further the test engine is using scavenging to provide high engine torque at low engine speeds, which has a negative impact on CO2 emissions. The variable cross section compressor enables the engine to provide the same peak torque at the same speed without valve overlap.

UR - http://www.scopus.com/inward/record.url?scp=85048533411&partnerID=8YFLogxK

U2 - 10.4271/2018-37-0004

DO - 10.4271/2018-37-0004

M3 - Conference article

AN - SCOPUS:85048533411

VL - 2018-May

JO - SAE Technical Papers

JF - SAE Technical Papers

IS - May

T2 - 2nd CO2 Reduction for Transportation Systems Conference, CO2 2018

Y2 - 6 June 2018 through 8 June 2018

ER -