Modeling Combustion of Methane Modeling Combustion of Methane - - Hydrogen Blends in Internal Hydrogen Blends in Internal Combustion Engines Combustion Engines (BONG (BONG - - HY) HY) Prof. Stefano Cordiner Ing. Vincenzo Mulone Ing. Riccardo Scarcelli Università degli Studi di Roma “Tor Vergata”
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Modeling Combustion of MethaneModeling Combustion of Methane--
Hydrogen Blends in Internal Hydrogen Blends in Internal Combustion EnginesCombustion Engines
(BONG(BONG--HY)HY)
Prof.
Stefano Cordiner
Ing.
Vincenzo Mulone
Ing.
Riccardo Scarcelli
Università
degli Studi di Roma “Tor Vergata”
Index
Target of the Work
Computational Tools
Turbulent Combustion Models
Approach and Results
Conclusions and Future Perspectives
Index
Target of the Work
Computational Tools
Turbulent Combustion Models
Approach and Results
Conclusions and Future Perspectives
Numerical Study of the Influence of Substitution of Methane with Hydrogen (15% vol.) on Combustion
Target
Numerical Analysis of the Influence of Main Engines Parameters (Spark Advance and Air Index) on Performance and Emissions
NUMERICAL-EXPERIMENTAL PROCEDURE FOR ENGINE OPTIMISATION
Index
Target
Computational Tools
Turbulent Combustion Models
Approach and Results
Conclusions and Future Perspectives
1D Codes: Framework Code (FW2000)
Analysis of the Behaviour
of the whole Engine
Integrated Code 0D-1D• Zero-dimensional elements
(capacities, cylinder-piston)
• One-dimensional elements (ducts, heat exchangers)
• Joint elements
Volumetric Efficiency Calculation
2 3 41
3D Codes: KIVA-3V Code
Analysis of Cylinder -
Piston System
• Open Source CFD code
• Models of injection, ignition, turbulent combustion
The Introduction of Hydrogen into a Methane/Air Mixture provides Increased Flame Propagation Speed, thus leading to Higher Performance and Reduced Emissions (CO2, HC). The increase in [NOX] can be contained by following two approaches:
A decrease in spark time advance (+4° for all operating conditions) for stoichiometric mixtures. Results are a decrease in CO2 emissions (-15%) and a slight reduction in performance (-10%)
The utilization of lean mixtures (λ>1.4) with unchanged spark advance, with a further reduction of CO2 emissions (-20%), even though performance drastically drop (-50%)
Future Perspectives
Spark Advance Optimization for Lean Mixtures.Study of Flammability Limits of Methane-Hydrogen Blends
Development of NOx formation models
Design of combustion chambers and ducts to improve volumetric efficiency (λv)
Spark Advance Optimization for Lean Mixtures
Increase Spark Time Advance
Increase Pressure and Temperature
Increase [NOX ]
Modeling Combustion of MethaneModeling Combustion of Methane--
Hydrogen Blends in Internal Hydrogen Blends in Internal Combustion EnginesCombustion Engines