Details
| Original language | English |
|---|---|
| Journal | SAE Technical Papers |
| Publication status | Published - 29 Mar 2022 |
| Event | SAE 2022 Annual World Congress Experience, WCX 2022 - Virtual, Online, United States Duration: 5 Apr 2022 → 7 Apr 2022 |
Abstract
A single-stage turbocharger turbine is developed with the objective of enabling a gasoline spark-ignition engine to operate under lean-burn conditions with an air-to-fuel ratio of ?=2 in the range of the Worldwide Harmonized Light-Duty Vehicles Test Cycle. For this purpose, extensive 1-D engine simulations are performed using a combination of a simple compressor and simple turbine model as well as a combination of the stock compressor and a simple turbine model. The results show that an isentropic turbine efficiency of more than 70#x00025; over a wide operating range is required for the desired engine operation - especially with regard to the low-end-torque. Based on the crank-angle-resolved engine simulation data, turbine requirements are determined. Their evaluation shows that an axial turbine is a reasonable alternative to conventional radial turbines for this application. Next, a preliminary axial turbine is designed using 1-D/2-D design approaches. Then, the corresponding performance map is calculated by 3-D CFD simulations showing isentropic total-to-static turbine efficiencies of up to 77#x00025; over a wide operating range. Ultimately, the derived turbine performance map is implemented into the 1-D engine model and the valve train settings are optimized for this configuration to enhance the lean-burn performance further. The simulation results show a significantly extended ?=2 operating range in comparison to the stock turbine.
ASJC Scopus subject areas
- Engineering(all)
- Automotive Engineering
- Engineering(all)
- Safety, Risk, Reliability and Quality
- Environmental Science(all)
- Pollution
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: SAE Technical Papers, 29.03.2022.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Axial Turbine Turbocharger for Charging a Lean-Burn Gasoline Engine
AU - Sagan, Lukas
AU - Kuestner, Christoph
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 eV (FVV, Frankfurt am Main, Germany). The research is performed at the Institute of Internal Combustion Engines at the Technische Universität Braunschweig under the direction of Prof. Dr.-Ing. Peter Eilts and the Institute of Turbomachinery and Fluid Dynamics at the Leibniz Universität Hannover under the direction of Prof. Dr.-Ing. Joerg R. Seume. The project is supported by an expert group led by Dipl.-Ing. Marc Sens (IAV GmbH). The authors gratefully thank the support received from the chairmen and from all members of the project user committee. Further, the authors gratefully thank the BMW Group for supplying the baseline 1-D engine simulation model and the IAV GmbH for supplying the predictive combustion model. Finally, the results presented here were carried out on the cluster system at the Leibniz Universität Hannover, Germany, under Grant. This support is gratefully acknowledged.
PY - 2022/3/29
Y1 - 2022/3/29
N2 - A single-stage turbocharger turbine is developed with the objective of enabling a gasoline spark-ignition engine to operate under lean-burn conditions with an air-to-fuel ratio of ?=2 in the range of the Worldwide Harmonized Light-Duty Vehicles Test Cycle. For this purpose, extensive 1-D engine simulations are performed using a combination of a simple compressor and simple turbine model as well as a combination of the stock compressor and a simple turbine model. The results show that an isentropic turbine efficiency of more than 70#x00025; over a wide operating range is required for the desired engine operation - especially with regard to the low-end-torque. Based on the crank-angle-resolved engine simulation data, turbine requirements are determined. Their evaluation shows that an axial turbine is a reasonable alternative to conventional radial turbines for this application. Next, a preliminary axial turbine is designed using 1-D/2-D design approaches. Then, the corresponding performance map is calculated by 3-D CFD simulations showing isentropic total-to-static turbine efficiencies of up to 77#x00025; over a wide operating range. Ultimately, the derived turbine performance map is implemented into the 1-D engine model and the valve train settings are optimized for this configuration to enhance the lean-burn performance further. The simulation results show a significantly extended ?=2 operating range in comparison to the stock turbine.
AB - A single-stage turbocharger turbine is developed with the objective of enabling a gasoline spark-ignition engine to operate under lean-burn conditions with an air-to-fuel ratio of ?=2 in the range of the Worldwide Harmonized Light-Duty Vehicles Test Cycle. For this purpose, extensive 1-D engine simulations are performed using a combination of a simple compressor and simple turbine model as well as a combination of the stock compressor and a simple turbine model. The results show that an isentropic turbine efficiency of more than 70#x00025; over a wide operating range is required for the desired engine operation - especially with regard to the low-end-torque. Based on the crank-angle-resolved engine simulation data, turbine requirements are determined. Their evaluation shows that an axial turbine is a reasonable alternative to conventional radial turbines for this application. Next, a preliminary axial turbine is designed using 1-D/2-D design approaches. Then, the corresponding performance map is calculated by 3-D CFD simulations showing isentropic total-to-static turbine efficiencies of up to 77#x00025; over a wide operating range. Ultimately, the derived turbine performance map is implemented into the 1-D engine model and the valve train settings are optimized for this configuration to enhance the lean-burn performance further. The simulation results show a significantly extended ?=2 operating range in comparison to the stock turbine.
UR - http://www.scopus.com/inward/record.url?scp=85128044292&partnerID=8YFLogxK
U2 - 10.4271/2022-01-0377
DO - 10.4271/2022-01-0377
M3 - Conference article
AN - SCOPUS:85128044292
JO - SAE Technical Papers
JF - SAE Technical Papers
SN - 0148-7191
T2 - SAE 2022 Annual World Congress Experience, WCX 2022
Y2 - 5 April 2022 through 7 April 2022
ER -