In this study, an experiment of macroscopic spray performance of stabilized nanofuels under high injection and ambient pressure is conducted on a Common rail direct fuel injection. The tested nanofuels have been prepared by DE20 (20% ethanol, 80% diesel by volume) blends with nano-CeO₂ at 25 ppm(DE20Ce25), 50 ppm(DE20Ce50),100 ppm(DE20Ce100) respectively. Furthermore, appropriate amount of CTAB whose weight is equal to CeO₂ and 2%vol 1-decanol were added as surfactant additive. All tested fuels were ultrasonically oscillated at a frequency of 40khz for 45min in order to enhance their stability. The macroscopic spray characteristics of diesel-ethanol with dispersed cerium nanoparticles have been measured using the optical diagnostic techniques of shadowgraph. Comparing with those the pure diesel(D100), the spray penetration of DE20, DE20Ce25, DE20Ce50, DE20Ce100 increased by −3%, −1.8%, −0.3% and 9.5%, while the spray cone angle increased by −3%,4%,2.8% and 12.5% as well as spray area increased by −3%,-1.3%,0.6% and 31% respectively. The addition of nanoparticles also enhances the instability of fuel and shortens the crucial breakup time. In addition, the influence caused by increasing viscosity and surface tension are balanced by the disturbance. Furthermore, the macroscopic spray characteristics of DE20Ce50 show little difference with the pure diesel which means it can be a promising alternative fuel for CI engine with no required modification.

在这项研究中，对共轨直接燃油喷射进行了在高喷射和环境压力下稳定的纳米燃料宏观喷射性能的实验。分别通过将DE20（20％乙醇，80％体积比柴油）与纳米CeO _2分别以25 ppm（DE20Ce25），50 ppm（DE20Ce50），100 ppm（DE20Ce100）的混合物混合来制备测试的纳米燃料。此外，适量的CTAB重量等于CeO ₂加入2％vol的1-癸醇作为表面活性剂添加剂。为了提高其稳定性，所有测试的燃料均以40khz的频率超声振荡45分钟。柴油-乙醇与分散的铈纳米粒子的宏观喷雾特性已使用阴影图的光学诊断技术进行了测量。与纯柴油（D100）相比，DE20，DE20Ce25，DE20Ce50，DE20Ce100的喷雾渗透率增加了-3％，-1.8％，-0.3％和9.5％，而喷雾锥角增加了-3％，4 ％，2.8％和12.5％以及喷雾面积分别增加了-3％，-1.3％，0.6％和31％。纳米颗粒的添加还增强了燃料的不稳定性，并缩短了关键的分解时间。另外，由粘度增加和表面张力引起的影响被干扰平衡。此外，