Acta Mechanica Slovaca 2024, 28(2):28-43 | DOI: 10.21496/ams.2024.007

Modelling of Pulsed Flow Effects Through the Exhaust System of a Turbocharged Engine Using Mixed Flow Turbine

Djamel Mazari1, Mustapha Bordjane2, Mohammed Hamel2, Khadidja Boualem3
1 University of Ibn Khaldoun-Tiaret(14000), Algeria
2 University of Sciences and Technology Mohamed Boudiaf-Oran(31000), Algeria
3 University of Relizane-Relizane(4800), Algeria

For some decades, reductions of fuel consumption and pollutant emission control have become the first requirement for internal combustion engines. Turbocharging is a promising way among many techniques to solve this problem since it leads to a downsized, lighter and more compact engine. Two important novelties can be listed in this study, the first is the development of a thermodynamic (zero dimensional) model for the gas expansion process through the exhaust system of turbocharged internal combustion engines. The latter is used to setup the unsteady state analysis using interpolation function for cyclic time of the internal combustion engine and the boundary conditions at the exhaust manifold inlet. The second point is the study of the complete exhaust line from the valves ports to the turbine diffuser including the exhaust manifolds which has strong influences on the flow characteristics at the volute inlet. Numerical investigation using three dimensional, viscous, turbulent and compressible flow is performed. In the first step, a steady state simulation is considered just to validate the computational results. In the second step, an unsteady state is planned with conditions like those encountered in real applications. Numerical results from mixed-flow turbine used as test case, are presented. The results include performances and flow characteristics, predictions of blade loading, cyclic pressure, cyclic mass flow rate, inlet-outlet flow parameters and flow structure.

Keywords: Turbocharging; modelling; blade loading; flow structure; unsteady state analysis.

Received: March 17, 2024; Revised: April 23, 2024; Accepted: April 26, 2024; Published: June 14, 2024  Show citation

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Mazari, D., Bordjane, M., Hamel, M., & Boualem, K. (2024). Modelling of Pulsed Flow Effects Through the Exhaust System of a Turbocharged Engine Using Mixed Flow Turbine. Acta Mechanica Slovaca, 28(2), 28-43. doi: 10.21496/ams.2024.007
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