Intake System Optimization in Internal Combustion Engines
Summary
Optimisation of the intake system in internal combustion engines centres on enhancing the delivery of air (or air–fuel mixtures) to the combustion chamber in order to maximise power, reduce fuel consumption and limit pollutant formation. Key components include the intake manifold, plenum chamber and port geometry, together with valve timing and lift profiles. Designers seek to tune pressure waves and harness resonance effects to improve volumetric efficiency across a broad speed range, while introducing controlled swirl and tumble to promote rapid, uniform mixing. Advances in computational fluid dynamics (CFD), one-dimensional and multi-dimensional coupling tools, as well as optimisation algorithms, have driven the field towards highly tailored solutions for automotive, marine, heavy-duty and aeronautical applications. Such improvements yield tangible benefits in emission reduction, energy efficiency and global regulatory compliance.
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Intake System Optimization in Internal Combustion Engines publication trend
The graph below shows the total number of articles in intake system optimization in internal combustion engines across all publications each year (not limited to Nature Index journals).
Technical terms
Volumetric efficiency: The ratio of actual mass of air inducted to the theoretical mass if the cylinder were completely filled at ambient conditions.
Swirl: A rotational flow motion about the cylinder axis that promotes axial mixing and flame propagation.
Tumble: A rotational flow motion perpendicular to the cylinder axis that enhances in-cylinder turbulence and mixing.
Plenum: A chamber within the intake manifold that acts as a buffer for pressure waves and distributes charge to individual ports.
Brake-specific fuel consumption (BSFC): A measure of fuel efficiency defined as mass of fuel consumed per unit of power output over time.
References
- The Influence of the Intake Geometry on the Performance of a Four-Stroke SI Engine for Aeronautical Applications. Energies (2024).
- Influence of Intake Port Structure on the Performance of a Spark-Ignited Natural Gas Engine. Energies (2022).
- Optimization Analysis of Engine Intake System Based on Coupling Matlab‐Simulink with GT‐Power. Mathematical Problems in Engineering (2021).
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