Development of Spray and Combustion Method for Low Environmental Load by Fuel Design Approach

在定容容器中研究了双组分燃油喷雾的着火特性。实验结果表明，即使掺入大量的低可燃性燃料，点火特性仍以高可燃性燃料为主。此外，我们还得出结论，点火的增强来自于较高可燃性燃料在低温氧化反应中放热量的增加。在本实验条件下，十六烷值高于正十烷的混合燃料具有较高的可燃性。此外，我们还研究了两种混合燃料在低温氧化反应和高温氧化反应下的化学物种空间分布。一种(燃料A)由高可燃性燃料和低可燃性燃料组成，这些燃料具有相似的沸点。另一种燃料(燃料B)也由高和低可燃性燃料组成，但高可燃性燃料…越多波动率越低，越低波动率越高。在低温反应情况下，前者在液体长度附近观察到自然火焰发射，当量比较高。另一方面，后者的化学发光在燃料喷雾的下游被捕获。高沸点燃料混合时，虽然降低了两相区形成的一个原因，但其挥发时间比高沸点燃料早，从而抑制了高燃点燃料在液体长度附近的反应。相反，在高温反应情况下，燃料B在喷雾中的排放高于燃料A的排放，这是上述高沸点燃料形成两相区和强化蒸发的证据。实验分析表明，混合燃料具有结合高可燃性和挥发性的潜力，为未来燃料的应用提供了新的途径。较少

Ignition characteristics of two-component fuel spray were investigated in constant volume vessel. The result drawn from present experiment is that ignition characteristics were dominated by higher ignitability fuel even if much amount of lower one was blended. Furthermore, we concluded that the enhancement of ignition was derived from increase of amount of exothermic heat under low temperature oxidation reaction caused by higher ignitability fuel. In this experimental condition, ignitability of mixed fuel, which consists of much amount of low ignitability fuel, was enhanced by the fuel which has higher cetane number than that of n-Decane.In addition, we investigated the spatial distribution of chemical species regarding two types of mixed fuels under low and high temperature oxidation reaction. One (fuel A) consists of high and low ignitability fuels and these have similar boiling point. And the other (fuel B) also consists of high and low ignitability fuels, but high ignitability fuel … More has lower volatility and low one has higher volatility. In the case of low temperature reaction, natural flame emission of the former was observed near liquid length where equivalence ratio is high. On the other hand, chemiluminescence of the latter was captured further downstream in fuel spray. Although the volatility of higher boiling point fuel is improved by lower one cause of formation of two-phase region if they are mixed, lower one evaporates earlier than higher one and that inhibits the reaction of high ignitability fuel near liquid length. In contrast, in the case of high temperature reaction, the emission of fuel B was observed upper region in fuel spray than that of fuel A. Consequently, this is the evidence for formation of two-phase region and enhancement of evaporation of high boiling point fuel mentioned above. Thus, the high ignitability fuel accumulated in upper region inside spay initiated the high temperature reaction.Our experimental analysis shows that mixed fuel has a potential to combine high ignitability and volatility characteristics and applies the future application method about fuels. Less