Study of Assisted Compression Ignition in a Direct Injected Natural Gas Engine
| Autor: | James S. Wallace, Ivan M. Gogolev |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
020209 energy Energy Engineering and Power Technology Aerospace Engineering 02 engineering and technology Combustion 7. Clean energy law.invention 0203 mechanical engineering Physics::Plasma Physics law Carbureted compression ignition model engine 0202 electrical engineering electronic engineering information engineering Physics::Chemical Physics Spontaneous combustion Simulation Mechanical Engineering Homogeneous charge compression ignition Mechanics Ignition system Minimum ignition energy 020303 mechanical engineering & transports Fuel Technology Nuclear Energy and Engineering 13. Climate action Glow plug Ignition timing |
| Zdroj: | Journal of Engineering for Gas Turbines and Power. 139 |
| ISSN: | 1528-8919 0742-4795 |
| DOI: | 10.1115/1.4036968 |
| Popis: | Natural gas direct injection (DI) and glow plug ignition assist technologies were implemented in a single-cylinder, compression-ignition optical research engine. Initial experiments studied the effects of injector and glow plug shield geometry on ignition quality. Injector and shield geometric effects were found to be significant, with only two of 20 tested geometric combinations resulting in reproducible ignition. Of the two successful combinations, the combination with 0 deg injector angle and 60 deg shield angle was found to result in shorter ignition delay and was selected for further testing. Further experiments explored the effects of the overall equivalence ratio (controlled by injection duration) and intake pressure on ignition delay and combustion performance. Ignition delay was measured to be in the range of 1.6–2.0 ms. Equivalence ratio was found to have little to no effect on the ignition delay. Higher intake pressure was shown to increase ignition delay due to the effect of swirl momentum on fuel jet development, air entrainment, and jet deflection away from optimal contact with the glow plug ignition source. Analysis of combustion was carried out by examination of the rate of heat release (ROHR) profiles. ROHR profiles were consistent with two distinct modes of combustion: premixed mode at all test conditions, and a mixing-controlled mode that only appeared at higher equivalence ratios following premixed combustion. |
| Databáze: | OpenAIRE |
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