| EFFECT OF TURBINE UPSTREAM GEOMETRY ON PULSATING FLOW
AND TURBOCHARGED SI-ENGINE PERFORMANCE |
| Jeyoung Kim 1,2, Meng Soon Chiong 2, Srithar Rajoo 2 |
1University of Vaasa, School of Technology and Innovations
2UTM-LoCARtic, IVeSE, Universiti Teknologi Malaysia |
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| ABSTRACT |
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The pulsating exhaust flow propagates through the exhaust line upon opening of exhaust valves while carrying
a high amount of energy (high pressure and temperature). The amount of energy delivered to the turbine could be affected by
turbine upstream geometry along with the propagation. Therefore, in this study, the impact of the turbine upstream geometry
(diameter, length of exhaust runner, and exhaust manifold volume) on pulsating flow and engine & turbocharger has been
investigated using 1D engine simulation packages, AVL-BOOST. A validated 1-liter 3-cylinder SI-engine model was utilized
as a base engine model. The simulation captured how different geometry influences the pulsating pressure profile and the
impact on system-level performance and behavior. The current research highlighted that the exhaust manifold volume is
strongly associated with exhaust resistance, scavenging, pulsation, knocking, and fuel economy. By minimizing unnecessary
volume in the exhaust manifold, it presents high potentials to improve low-speed torque (~15 %), fuel consumption (~2.4 %),
brake thermal efficiency (~1.4 %), scavenging and knock resistance against the baseline model. |
| Key Words:
1D engine simulation, Pulsating exhaust flow, Exhaust geometry, Exhaust resistance, Boosting system,
Low-speed torque |
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Corresponding Author.
Srithar Rajoo , Email. 
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