Numerical Simulation and Comparison of Different Steady-State Tumble Measuring Configurations for Internal Combustion Engines
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Flow Coefficients and Tumble Ratios
3.2. HWA Configuration
3.3. Ricardo T-Tube and L-Tube Configurations
3.4. FEV Configuration
4. Discussion
5. Conclusions
- The Ricardo L-tube configuration generates a non-symmetrical flow field inside the cylinder even if the cylinder head and the inlet valve lifts are symmetrical.
- Both Ricardo configurations, in place of the piston, have the exit tubes’ bottom side, which affects the angular momentum of the flow.
- The FEV configuration is technically more demanding than the Ricardo configurations, having the rotating paddle wheel inside the cylinder. The use of the rotating paddle wheel has also the disadvantage that affects the flow field. The small diameter of the exit tube restricts the flow. On the other hand, it allows for the use of a real production piston and can assess how its crown shape affects the tumble.
- All integral methods can be effectively used only when the axis of the tumbling flow inside the cylinder is parallel with the exit tubes or the axis of the rotating paddle wheel. That is not always the case (i.e., when the lift of the inlet valves is not equal or one of the inlet valves is deactivated).
- HWA measurements for tumble ratio estimation require more expensive equipment and effort. The flow field inside the cylinder in regions away from the cylinder head is not relevant with the flow field inside the cylinder of a motored engine.
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Stroke (mm) | 89.7 |
Bore (mm) | 87.5 |
Pentroof angle (deg) | 17° |
Diameter of inlet valves (mm) | 32 |
Angle of valve’s seat (deg) | 45° |
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Theodorakakos, A. Numerical Simulation and Comparison of Different Steady-State Tumble Measuring Configurations for Internal Combustion Engines. Computation 2024, 12, 138. https://doi.org/10.3390/computation12070138
Theodorakakos A. Numerical Simulation and Comparison of Different Steady-State Tumble Measuring Configurations for Internal Combustion Engines. Computation. 2024; 12(7):138. https://doi.org/10.3390/computation12070138
Chicago/Turabian StyleTheodorakakos, Andreas. 2024. "Numerical Simulation and Comparison of Different Steady-State Tumble Measuring Configurations for Internal Combustion Engines" Computation 12, no. 7: 138. https://doi.org/10.3390/computation12070138
APA StyleTheodorakakos, A. (2024). Numerical Simulation and Comparison of Different Steady-State Tumble Measuring Configurations for Internal Combustion Engines. Computation, 12(7), 138. https://doi.org/10.3390/computation12070138