天然ガス利用デュアルフューエルエンジンにおける軽油多段噴射の燃焼特性

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  • Effects of the Multi Injection on a Natural-Gas Dual Fuel Engine

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<p>Dual fuel engines (DFE) suffer from considerably high total hydrocarbon emissions and low thermal efficiency due to its poor combustion at low loads. Also, further improvement of thermal efficiency is needed at high loads. Therefore, in this study, the effect of double diesel fuel injection on the combustion and exhaust emission characteristics of DFE using town gas 13A (natural gas) was investigated in the experiments. The experiments were conducted using a single-cylinder engine and with a common rail injection system, varying the number of fuel injection and injection timings. In lower loads, the combustion was activated by the double injection and both THC emissions and thermal efficiency were improved, especially when the MFB50 was advanced. On the other hand, at higher loads, although the thermal efficiency slightly improved by the double injection, NOx emissions increased. This was because the in-cylinder temperature increased too much as the MFB50 approached top dead center.</p>

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