Axial Turbine Turbocharger for Charging a Lean-Burn Gasoline Engine

Publikation: Beitrag in FachzeitschriftKonferenzaufsatz in FachzeitschriftForschungPeer-Review

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  • Technische Universität Braunschweig
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OriginalspracheEnglisch
FachzeitschriftSAE Technical Papers
PublikationsstatusVeröffentlicht - 29 März 2022
VeranstaltungSAE 2022 Annual World Congress Experience, WCX 2022 - Virtual, Online, USA / Vereinigte Staaten
Dauer: 5 Apr. 20227 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.

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Axial Turbine Turbocharger for Charging a Lean-Burn Gasoline Engine. / Sagan, Lukas; Kuestner, Christoph; Eilts, Peter et al.
in: SAE Technical Papers, 29.03.2022.

Publikation: Beitrag in FachzeitschriftKonferenzaufsatz in FachzeitschriftForschungPeer-Review

Sagan L, Kuestner C, Eilts P, Seume J. Axial Turbine Turbocharger for Charging a Lean-Burn Gasoline Engine. SAE Technical Papers. 2022 Mär 29. doi: 10.4271/2022-01-0377
Sagan, Lukas ; Kuestner, Christoph ; Eilts, Peter et al. / Axial Turbine Turbocharger for Charging a Lean-Burn Gasoline Engine. in: SAE Technical Papers. 2022.
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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.",
author = "Lukas Sagan and Christoph Kuestner 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 eV (FVV, Frankfurt am Main, Germany). The research is performed at the Institute of Internal Combustion Engines at the Technische Universit{\"a}t Braunschweig under the direction of Prof. Dr.-Ing. Peter Eilts and the Institute of Turbomachinery and Fluid Dynamics at the Leibniz Universit{\"a}t 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 Universit{\"a}t Hannover, Germany, under Grant. This support is gratefully acknowledged. ; SAE 2022 Annual World Congress Experience, WCX 2022 ; Conference date: 05-04-2022 Through 07-04-2022",
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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

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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.

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