含水乙醇汽油稳定性优化及在GDI发动机的试验

STABILITY OPTIMIZATION OF HYDROUS ETHANOL-GASOLINE AND ITS TEST ON GDI ENGINE

为提高含水乙醇汽油稳定性，基于中心组合设计分析后发现：添加适量乳化剂和助溶剂，可使E10w（含水乙醇占比10％，V/V）的相分离温度由最初15℃降至～4℃。将E10W应用到GDI发动机上，在中低转速全负荷工况下，E10W的扭矩及功率略高于E10和汽油，在3．44％以内；实际比油耗与E10大致相同，高于汽油2．50％～4．47％，当量比油耗低于汽油0．24％～2．12％；CO、THC、NOx排放均优于E10，低速时略劣于汽油，随转速提高后接近甚至优于汽油。

In order to improve the stability of hydrous ethanol-gasoline, based on analyzing and optimizing the experiment using central composite design, it is found that adding suitable amount of emulsifier and cosolvent can reduce phase separation temperature of E10W （containing 10% hydrous ethanol V/V） from 15 ℃ to -4 ℃. Under the low and medium speed and 100% load, the power and torque of the GDI engine fuelled with E10W are slightly higher than fuelled with El0 and gasoline, within the increment of 3.44%; the specific fuel consumption （SFC） of E10W is similar to E 10 while 2.5%-4.47% higher than gasoline, and calorific value equivalent of fuel consumption is 0.24%-2.12% less than gasoline; CO, THC and NOx emissions of E10W are lower than E 10, and slightly higher than these of gasoline at low engine speed but close to or even lower than these of gasoline when the engine speed increases.