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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part D. Journal of Automobile Engineering >Combustion and emission characteristics of a gasoline-dimethyl ether dual-fuel engine
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Combustion and emission characteristics of a gasoline-dimethyl ether dual-fuel engine

机译：汽油-二甲醚双燃料发动机的燃烧和排放特性

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摘要

An experimental investigation was performed to investigate the effect of a split-injection strategy on the combustion and exhaust emission characteristics as well as on the particle number distribution for a single-cylinder compression ignition engine with gasoline-dimethyl ether dual fuelling. The gasoline-dimethyl ether dual-fuel injection system utilized port injection for gasoline and direct injection for dimethyl ether. In the present system, premixed fuel (i.e. gasoline) was injected into the premixing chamber at an injection pressure of 3 MPa using gasoline direct injection to mix the air-gasoline mixture sufficiently. However, dimethyl ether fuel was injected at an injection pressure of 50 MPa directly into a combustion chamber in order to control the combustion phase, resulting in a change in the direct-injection timing from -20° to +2° crank angle. The experimental results show that the gasoline-dimethyl ether dual-fuel engine exhibited benefits in the indicated mean effective pressure for early-injection cases (i.e. near - 10° crank angle after top dead centre). However, the indicated mean effective pressure of the gasoline-dimethyl ether dual-fuel engine deteriorated for delayed-injection cases owing to incomplete combustion. In addition, a significant reduction in the nitrogen oxide emissions was observed using gasoline-dimethyl ether dual fuel compared with those obtained using conventional dimethyl ether combustion. In particular, soot emissions are almost at zero level for all the cases. On the other hand, hydrocarbon and carbon dioxide emissions increase with an increasing portion of premixed injection fuel (i.e. gasoline) in conventional injection timing, which is near top dead centre.
机译：进行了实验研究，以研究分流喷射策略对采用汽油-二甲醚双燃料的单缸压缩点火发动机的燃烧和排气排放特性以及颗粒数量分布的影响。汽油-二甲醚双燃料喷射系统利用汽油的进气道喷射和二甲醚的直接喷射。在本系统中，使用汽油直接喷射以3MPa的喷射压力将预混合燃料（即汽油）喷射到预混合室中，以充分混合空气-汽油混合物。然而，为了控制燃烧阶段，以50MPa的喷射压力将二甲醚燃料直接喷射到燃烧室中，导致直接喷射正时从-20°变为+ 2°曲柄角。实验结果表明，汽油-二甲醚双燃料发动机在指示的早期喷射情况下（即，上止点后的曲柄角接近-10°）的平均有效压力方面表现出优势。然而，由于不完全燃烧，在延迟喷射的情况下，汽油-二甲醚双燃料发动机的指示平均有效压力降低了。另外，与使用常规二甲醚燃烧获得的汽油相比，使用汽油-二甲醚双重燃料可观察到氮氧化物排放的显着减少。特别是在所有情况下，烟尘排放量几乎都为零。另一方面，在接近上止点的常规喷射定时中，碳氢化合物和二氧化碳的排放随着预混合喷射燃料（即汽油）的增加而增加。

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