Onojowho Elijah Eferoghene, Betiku Eriola, Asere Abraham Awolola
Department of Mechanical Engineering, Obafemi Awolowo University, Ile-Ife, Nigeria.
Department of Mechanical Engineering, University of Nigeria, Nsukka, Nigeria.
Heliyon. 2024 Mar 24;10(7):e28380. doi: 10.1016/j.heliyon.2024.e28380. eCollection 2024 Apr 15.
This work aimed at investigating blends of biodiesel in a compression ignition engine, attempting to improve engine performance and reduce CO emission compared with conventional diesel. Analysis of System (ANSYS) was used to predict in-cylinder behavior of the fuel. ANSYS SpaceClaim generated the geometric model on which 5° sector and mesh refinement was on ANSYS Internal Combustion Engine Modeler (ICEM). Computational domain of interest lies within the compression and expansion strokes. Experimental validation followed: 5% biodiesel, 95% diesel (B); 15% biodiesel, 85% diesel (B); 25% biodiesel, 75% diesel (B); pure diesel (D); pure biodiesel (B) in volume proportions. B has the highest brake mean effective pressure (BMEP) of 4 bar as load increases. An experimental and numerical comparison reveals pressure declination against speed increment. Ignition temperature fluctuated between 799.76 and 806.256 K for D and 760.73-790.62 K for B within 1800-2800 rpm speed limit prediction. Power and brake thermal efficiency (BTE) had parallel load increment with all blends. CO emission on increasing load conditions were 47.01%, 8.07%, 21.72% and 6.06% for B, B, B, and B respectively lower than D. Pressure and temperature contours gave proper combustion predicted behaviors. All blends possess replaceable performance potential for D however, B offers better reliable potentials.
这项工作旨在研究压缩点火发动机中生物柴油的混合燃料，试图与传统柴油相比提高发动机性能并减少一氧化碳排放。使用系统分析（ANSYS）来预测燃料在气缸内的行为。ANSYS SpaceClaim生成几何模型，在ANSYS内燃机建模器（ICEM）上进行5°扇形划分和网格细化。感兴趣的计算域位于压缩和膨胀冲程内。随后进行了实验验证：按体积比例分别为5%生物柴油、95%柴油（B）；15%生物柴油、85%柴油（B）；25%生物柴油、75%柴油（B）；纯柴油（D）；纯生物柴油（B）。随着负荷增加，B的制动平均有效压力（BMEP）最高，为4巴。实验和数值比较表明压力随速度增加而下降。在1800 - 2800转/分钟的速度限制预测范围内，D的点火温度在799.76至806.256K之间波动，B的点火温度在760.73 - 790.62K之间波动。所有混合燃料的功率和制动热效率（BTE）都随负荷平行增加。在负荷增加的情况下，B、B、B和B的一氧化碳排放量分别比D低47.01%、8.07%、21.72%和6.06%。压力和温度等值线给出了正确的燃烧预测行为。所有混合燃料都具有替代D的性能潜力，然而，B具有更好的可靠潜力。
