The research on the fuel composition of the ultra lean mixture for C.I.engines

在检查燃料组成之前，通过使用实际压燃式发动机检查作为候选燃料的特性。作为候选燃料的是二甲基醚（DME）。二甲醚在发动机中燃烧，无碳烟排放，碳氢化合物浓度低，但NOx相对较高。二甲醚作为燃料表现出较低的自燃温度。利用二甲醚的特性，与丙烷混合。再次证实，混合燃料已经透明且稳定。证实当混合丙烷时，自燃温度升高。接着，研究了在空气中添加臭氧以控制自动点火时间的技术。自燃温度的降低是随着燃烧速率的增加而降低的，这是因为空气中的臭氧分解了一部分燃料与燃料的混合，当臭氧浓度为10000ppm时，燃烧速率增加约10%。进行了发动机试验，证实了臭氧对放热率曲线变化的影响。

The characteristic of the fuel as a candidate was examined by the use of actual compression ignition engine, before the fuel composition was examined. The fuel as a candidate is Dimethyl-Ether(DME). DME burns in the engine with soot free emission and low hydrocarbon concentration , however NOx were relatively high. DME as a fuel shows low auto ignition temperature. Using the characteristics of DME, it mixed with propane. It was confirmed that again, the blending fuel had transparently and been stabilized, It was confirmed that the auto ignition temperature rose, when propane is blended. Next, the technique which added the ozone in the air for the auto ignition time control was examined. The lowering of the auto ignition temperature can expect it with the increase in the burning rate, because the ozone in the air decomposes the part of the fuel with fuel and that it mixes it. The increase in the about 10% of burning velocity when the ozone concentration was at 10000ppm. The engine experiment was conducted and confirmed the effect of ozone on the changes in the pattern of rate of heat release curve.