Performance Analysis of a Waste-Gated Turbine for Automotive Engines: An Experimental and Numerical Study
In this article, the results of an experimental investigation and a 1D modeling activity on the steady-state performance of a wastegated turbocharger turbine for spark ignition engines are presented. An experimental campaign to analyze the turbine performance for different waste-gate valve openings...
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MDPI AG
2025-01-01
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| author | Carla Cordalonga Silvia Marelli Vittorio Usai |
| author_facet | Carla Cordalonga Silvia Marelli Vittorio Usai |
| author_sort | Carla Cordalonga |
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| description | In this article, the results of an experimental investigation and a 1D modeling activity on the steady-state performance of a wastegated turbocharger turbine for spark ignition engines are presented. An experimental campaign to analyze the turbine performance for different waste-gate valve openings was conducted at the test bench for components of propulsion systems of the University of Genoa. Thanks to the experimental activity, a 1D model is developed to assess the interaction between the flow through the impeller and the by-pass port. Advanced modeling techniques are crucial for improving the assessment of turbocharger turbines performance and, consequently, enhancing the engine–turbocharger matching calculation. The initial tuning of the model is based on turbine characteristic maps obtained with the by-pass port kept closed. The study then highlights the waste-gate valve behavior considering its different openings. It was found that a more refined model is necessary to accurately define the mass flow rate through the waste-gate valve. After independently tuning the 1D models of the turbine and the waste-gate valve, their behavior is analyzed in parallel-flow conditions. The results highlight significant interactions between the two components that must be taken into account to reduce inaccuracies in the engine-turbocharger matching calculation. These interactions lead to a reduced swallowing capacity of the turbine impeller. This reduction has an impact on the power delivered to the compressor, the boost pressure, and, consequently, the engine backpressure. The results suggest that methods generally adopted that consider the by-pass valve and the turbine as two nozzles working in parallel under the same thermodynamic condition could be insufficient to accurately assess the turbocharger behavior. |
| format | Article |
| id | doaj-art-f902987c34c449abb12f2ded632bd61c |
| institution | Kabale University |
| issn | 2075-1702 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-f902987c34c449abb12f2ded632bd61c2025-01-24T13:39:17ZengMDPI AGMachines2075-17022025-01-011315410.3390/machines13010054Performance Analysis of a Waste-Gated Turbine for Automotive Engines: An Experimental and Numerical StudyCarla Cordalonga0Silvia Marelli1Vittorio Usai2Department of Mechanical, Energy, Management and Transportation Engineering, University of Genoa, 16145 Genoa, ItalyDepartment of Mechanical, Energy, Management and Transportation Engineering, University of Genoa, 16145 Genoa, ItalyDepartment of Mechanical, Energy, Management and Transportation Engineering, University of Genoa, 16145 Genoa, ItalyIn this article, the results of an experimental investigation and a 1D modeling activity on the steady-state performance of a wastegated turbocharger turbine for spark ignition engines are presented. An experimental campaign to analyze the turbine performance for different waste-gate valve openings was conducted at the test bench for components of propulsion systems of the University of Genoa. Thanks to the experimental activity, a 1D model is developed to assess the interaction between the flow through the impeller and the by-pass port. Advanced modeling techniques are crucial for improving the assessment of turbocharger turbines performance and, consequently, enhancing the engine–turbocharger matching calculation. The initial tuning of the model is based on turbine characteristic maps obtained with the by-pass port kept closed. The study then highlights the waste-gate valve behavior considering its different openings. It was found that a more refined model is necessary to accurately define the mass flow rate through the waste-gate valve. After independently tuning the 1D models of the turbine and the waste-gate valve, their behavior is analyzed in parallel-flow conditions. The results highlight significant interactions between the two components that must be taken into account to reduce inaccuracies in the engine-turbocharger matching calculation. These interactions lead to a reduced swallowing capacity of the turbine impeller. This reduction has an impact on the power delivered to the compressor, the boost pressure, and, consequently, the engine backpressure. The results suggest that methods generally adopted that consider the by-pass valve and the turbine as two nozzles working in parallel under the same thermodynamic condition could be insufficient to accurately assess the turbocharger behavior.https://www.mdpi.com/2075-1702/13/1/54turbochargerturbinewaste-gateinternal combustion engineperformanceexperimental |
| spellingShingle | Carla Cordalonga Silvia Marelli Vittorio Usai Performance Analysis of a Waste-Gated Turbine for Automotive Engines: An Experimental and Numerical Study Machines turbocharger turbine waste-gate internal combustion engine performance experimental |
| title | Performance Analysis of a Waste-Gated Turbine for Automotive Engines: An Experimental and Numerical Study |
| title_full | Performance Analysis of a Waste-Gated Turbine for Automotive Engines: An Experimental and Numerical Study |
| title_fullStr | Performance Analysis of a Waste-Gated Turbine for Automotive Engines: An Experimental and Numerical Study |
| title_full_unstemmed | Performance Analysis of a Waste-Gated Turbine for Automotive Engines: An Experimental and Numerical Study |
| title_short | Performance Analysis of a Waste-Gated Turbine for Automotive Engines: An Experimental and Numerical Study |
| title_sort | performance analysis of a waste gated turbine for automotive engines an experimental and numerical study |
| topic | turbocharger turbine waste-gate internal combustion engine performance experimental |
| url | https://www.mdpi.com/2075-1702/13/1/54 |
| work_keys_str_mv | AT carlacordalonga performanceanalysisofawastegatedturbineforautomotiveenginesanexperimentalandnumericalstudy AT silviamarelli performanceanalysisofawastegatedturbineforautomotiveenginesanexperimentalandnumericalstudy AT vittoriousai performanceanalysisofawastegatedturbineforautomotiveenginesanexperimentalandnumericalstudy |