Abstract

This study investigates the influences of post-injection (PI) strategy and adding two concentrations (50 and 100 mg/l) of Cerium oxide (CeO₂) nanoparticles to the diesel-castor oil (C30D) and diesel on engine performance, NO_X emissions, and characteristics of PM. The adding CeO₂ nanoparticles to the C30D and diesel were tested under with PI and W/O PI strategy. The results indicated that the BTE increased by 9.42% from the blends of C30D + CeO₂ compared with diesel + CeO₂ under with and without PI strategy. Furthermore, the BSFC decreased by 16.46% from C30D + CeO₂ nanoparticles compared with diesel + CeO₂ nanoparticles. The cylinder pressure and ROHR increased with addition of CeO₂ nanoparticles to the C30D compared to the C30D, diesel, and diesel + CeO₂ under different PI strategy. For the same CeO₂ concentration, the results showed that the NO_X emissions decreased by 10.64% when adding 100 mg/L of CeO₂ to the C30D compared with diesel + CeO₂ nanoparticles by 8.73%. The adding 50 and 100 mg/L of CeO₂ to the C30D reduced the concentration of PM by 28.62 and 42.72%, respectively, compared C30D without additives. Besides, the adding both concentrations of CeO₂ to the diesel decreased the concentration of PM by 16.74 and 24.83%, respectively, compared without additives into the diesel fuel. It is found that the size of primary particles (d_po) slightly increased with addition of CeO₂ nanoparticles to the C30D and diesel under with and W/O PI strategy. The data of this experiment revealed that introduce the PI strategy and 100 mg/L of CeO₂ nanoparticles gives positive effect on engine performance, NO_X emissions, and total concentration of PM.

• Highlights

• The cylinder pressure and rate of heat release increased with addition of CeO₂ nanoparticles to the C30D.

• Adding nanoparticles to C30D decreased the BSFC and increased BTE compared with those of the C30D and diesel without additives.

• The blends of C30D + CeO₂ decreased the concentration of PM.

• Adding different concentration of CeO₂ nanoparticles increased the average particle diameter.

• The NO_X emissions decreased with addition CeO₂ nanoparticles to the C30D and diesel.

摘要

本研究调查了后喷射 (PI) 策略以及在柴油-蓖麻油 (C30D) 和柴油中添加两种浓度（50 和 100 mg/l）的氧化铈 (CeO _{2 ) 纳米颗粒对发动机性能、NO X}的影响PM 的排放和特性。在PI和W/O PI策略下对C30D和柴油中添加CeO _{2纳米粒子进行了测试。}结果表明，与柴油+ CeO ₂相比，在有和没有PI策略下，C30D + CeO _{2的混合物的BTE增加了9.42％。此外，与柴油 + CeO 2}相比， C30D + CeO ₂纳米颗粒的 BSFC 降低了 16.46%纳米粒子。与不同PI策略下的C30D、柴油和柴油+CeO ₂相比，C30D中添加CeO ₂纳米颗粒后气缸压力和ROHR增加。在相同CeO ₂浓度下，结果表明，在C30D中加入100 mg/L CeO _{2时，NO X}排放量比柴油+CeO ₂纳米颗粒降低8.73%，降低了10.64%。与不含添加剂的 C30D 相比，在 C30D中添加 50 和 100 mg/L CeO ₂后，PM 浓度分别降低了 28.62% 和 42.72%。此外，添加两种浓度的 CeO ₂与柴油中未添加添加剂相比，柴油中 PM 的浓度分别降低了 16.74% 和 24.83%。发现在with和W/O PI策略下，随着向C30D和柴油中添加CeO _{2纳米颗粒，初级颗粒的尺寸(} d _po )略有增加。该实验的数据表明，引入PI策略和100 mg/L的CeO _{2纳米颗粒对发动机性能、NO X}排放和PM总浓度产生了积极影响。

• 强调

• 随着向 C30D中添加 CeO _{2纳米颗粒，气缸压力和放热速率增加。}

• 与未添加添加剂的 C30D 和柴油相比，在 C30D 中添加纳米颗粒降低了 BSFC 并增加了 BTE。

• C30D + CeO ₂的混合物降低了PM 的浓度。

• 添加不同浓度的CeO ₂纳米粒子增加了平均粒径。

• NO _X排放随着向 C30D 和柴油中添加 CeO _{2纳米颗粒而降低。}