Effects of the multi diesel injection on natural-gas dual fuel engine

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 and injection strategy was developed. 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 of natural gas was activated by the double injection and both THC emissions and thermal efficiency were improved. By advancing the second injection timing, CA50 was shifted toward the top dead center and hence the thermal efficiency was improved. On the other hand, at higher loads, although the thermal efficiency slightly improved by the double injection, NOx emissions increased. It was suggested that the injection interval of double injection was appropriately selected and the injection timing was retarded so that the NOx emission can be suppressed while keeping the thermal efficiency high.

Abstract licence: CC BY-NC-ND

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