IN-CYLINDER FLOW ANALYSIS OF A TWO-STROKE INTERNAL COMBUSTION ENGINE

Year 2025, Volume: 10 Issue: 1, 1 - 15, 26.05.2025

Mehmet Gürsoylu , Richard Matas

Abstract

This study focuses on enhancing the airflow performance and achieving an optimal flow distribution within the cylinder of a 300CC internal combustion engine. Various parameters were analyzed using computational fluid dynamics (CFD) simulations in ANSYS Fluent to identify the most suitable turbulence model for intake manifold flow analysis. The investigation encompassed two different mass flow rates (0.1 kg/s and 0.05 kg/s), four turbulence models (SST k−ω, Realizable k−ϵ, RNG k−ϵ, RSM Reynolds Stress Model), and two flange positions (0 mm and 44 mm). The simulations were conducted with a 0.5-million-cell polyhedral mesh.

The analysis evaluated airflow characteristics, pressure losses, and mass flow distribution within the intake manifold and cylinder, as well as swirl patterns. All boundary conditions and external variables were maintained constant across simulations to ensure comparability. The study specifically considered a two-stroke engine configuration, characterized by continuous airflow through ports instead of the intermittent valve operation found in four-stroke engines. The findings provide insights into optimizing engine design for improved performance and efficiency.

Keywords

: FEM Based Simulations , Internal Combustion Engine Analysis , Cylinder Flow Dynamics , Two-Stroke Engine , ANSYS Fluent

References

• [1] Smith, J., & Brown, A. (2024). Computational Fluid Dynamics in Engineering Applications. International Journal of Production Research and Manufacturing Science, 12(3), 214-231.
• [2] Johnson, P., & Lee, S. (2024). CFD Analysis of Fluid Dynamics in Two-Stroke Engine Cycles. International Journal of Production Research and Manufacturing Science, 11(2), 145-160.
• [3] Gupta, R., & Patel, M. (2024). Integration of CFD and FEM for Engine Performance. E3S Web of Conferences, 22(5), 1001-1015.
• [4] Johnson, P., & Williams, H. (2020). Comparison of turbulence models for internal combustion engine simulations. Journal of Engineering Applications, 22(4), 445-459.
• [5] Zhang, Y., & Li, Z. (2019). Evaluation of k-epsilon, k-omega, and SST turbulence models in CFD simulations of intake manifold flow. Computers and Fluids, 45(8), 1764-1775.
• [6] Ali, M., & Kumar, V. (2021). Effectiveness of turbulence models for exhaust manifold simulations in internal combustion engines. Applied Thermal Engineering, 158, 1220-1234.
• [7] Singh, R., & Chandra, D. (2020). A comparative study of k-epsilon, RSM, and LES turbulence models in engine intake simulations. Journal of Fluid Mechanics, 48(5), 1205-1218.
• [8] Patel, M., & Gupta, R. (2019). Investigation of turbulence model accuracy for flow inside engine cylinders. International Journal of Engine Research, 21(3), 349-360.
• [9] Heywood, J. B. (1988). Internal Combustion Engine Fundamentals. McGraw-Hill Education.
• [10] Stone, R. (1999). Introduction to internal combustion engines (Vol 3). London: Macmillan.
• [11] Menter, F. R. (1994). Two-equation eddy-viscosity turbulence models for engineering applications. AIAA Journal, 32(8), 1598–1605.
• [12] Nouhaila, Ouyoussef, et al. "On the Accuracy of Turbulence Model Simulations of the Exhaust Manifold." Applied Sciences 14.12 (2024): 5262.
• [13] Galamboš, S. L., Nikolić, N. M., Ružić, D. A., & Dorić, J. Ž. (2020). An approach to computational fluid dynamics air-flow simulation in the internal combustion engine intake manifold. Thermal Science, 24(1 Part A), 127-136.
• [14] Abay, Mahmut Kurtuluş. Modeling of a diesel engine using computational fluid dynamics and combustion analysis. MSc thesis, Istanbul Technical University, Istanbul, Turkey, 2015.
• [15] Yavuz, I. (2000). Refined turbulence models for simulation of IC-engine cylinder flows. PhD thesis, West Virginia University, Morgantown, USA.