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ABSTRACT
Current work investigates the effect of injection pressure and double injection of diesel fuel on combustion and emissions in a reactivity controlled compression ignition (RCCI) engine at part load condition with premixed natural gas via CFD (Computational Fluid Dynamic) simulation coupled with chemical kinetic mechanism. The results indicate that high injection pressure of diesel fuel injection improves combustion features, which consequently decreases the amount of unburned hydrocarbon (HC) and carbon monoxide (CO) emissions. On the other side, less stratified mixture can be achieved with double injection of diesel fuel within the cylinder, which results in incomplete combustion and great emissions at part load. Results demonstrate that proper distribution of diesel fuel and formation of stratified mixture within the cylinder improves combustion development in RCCI strategy and then reduces HC and CO emissions at part load condition.
Nomenclature
| Greek | = | |
| γ | = | ratio of specific heats |
| ηc | = | combustion efficiency |
| Abbreviations | = | |
| aTDC | = | after top dead center |
| bTDC | = | before top dead center |
| CA10 | = | crank angle at which 10 percent mass fraction has combusted |
| CA50 | = | crank angle at which 50 percent mass fraction has combusted |
| CA90 | = | crank angle at which 90 percent mass fraction has combusted |
| CO | = | carbon monoxide |
| CI | = | compression ignition |
| CFD | = | computational fluid dynamics |
| CA | = | crank angle |
| CN | = | cetane number |
| CNG | = | compressed natural gas |
| CRI | = | common rail injection |
| DI | = | direct-injection |
| EGR | = | exhaust gas recirculation |
| GDI | = | gasoline direct injection |
| HD | = | heavy-duty |
| HC | = | unburned hydrocarbon |
| HCCI | = | homogenous charge compression ignition |
| HRR | = | heat release rate |
| HTHR | = | high temperature heat release |
| IC | = | internal combustion |
| IVC | = | intake valve closing |
| ITE | = | indicated thermal efficiency |
| LTC | = | low temperature combustion |
| LTHR | = | low temperature heat release |
| LHV | = | lower heating value |
| NG | = | natural gas |
| NOx | = | oxides of nitrogen |
| PFI | = | port-fuel-injection |
| PCCI | = | premixed charge compression ignition |
| PCI | = | premixed compression ignition |
| PPC | = | partially premixed combustion |
| PRR | = | pressure rise rate |
| RCCI | = | reactivity controlled compression ignition |
| RI | = | ringing intensity |
| RPM | = | revolutions per minute |
| SI | = | spark ignited |
| SOI | = | start of injection |
| TDC | = | top dead center |
Acknowledgment
The authors are grateful to FEV North America Inc. for providing the test data used in correlating the baseline simulation models.