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作为可再生燃料和改善能源安全的手段,乙醇被逐步推广使用。为研究含水的混合乙醇的燃烧性能以及水与乙醇—汽油的溶混性,试验了含乙醇0~100%的汽油、乙醇混合物,评价了混合物的喷雾特性、燃烧性能和颗粒物排放性能,进行了汽油、乙醇、水的三相图分析和试验。结果表明:在含水量不大于40%时,汽油乙醇混合物中水的存在,不妨碍混合物用作汽油直喷发动机燃料。向喷射汽油中加注乙醇,增大了喷射燃料的体积;以这种燃料注入并持续喷雾,尤其是在冷发动机情况下,降低了混合物均匀性,减少了燃烧稳定性,对于当量比混合物,还增加了颗粒物的排放。向喷射燃料的乙醇中加注水,在含水量不大于30%时,燃烧持续时间不明显增加,燃烧稳定性不明显减小。
As a renewable fuel and a means of improving energy security, ethanol is gradually being used. In order to study the combustion performance of water-containing mixed ethanol and the miscibility of water with ethanol-gasoline, the gasoline and ethanol mixtures containing 0-100% ethanol were tested and the spray characteristics, combustion performance and particulate emission performance of the mixture were evaluated. Gasoline, ethanol, water three-phase diagram analysis and testing. The results show that the presence of water in the gasoline-ethanol mixture does not prevent the mixture from being used as gasoline direct injection engine fuel when the water content is less than 40%. Ethanol is injected into the injected gasoline to increase the volume of the injected fuel. The injection of this fuel and continuous spraying, especially in the case of a cold engine, reduce the uniformity of the mixture and reduce the combustion stability. For the equivalence ratio mixture, It also increases the emission of particulate matter. Filling water injection of ethanol fuel, the water content of not more than 30%, the combustion duration did not significantly increase the combustion stability was not significantly reduced.