Kumar Putha Prasad, Pendyala Srinivas, Gugulothu Santhosh Kumar
Department of Mechanical Engineering, GITAM University, Hyderabad, India.
Department of Mechanical Engineering, National Institute of Technology Andhra Pradesh, Tadepalligudem, Andhra Pradesh, India.
Environ Sci Pollut Res Int. 2023 Jul 17. doi: 10.1007/s11356-023-28795-0.
An investigation has been conducted on a CRDI (common rail diesel injection) engine utilizing a blended fuel using mahua methyl ester to explore the influence of fuel injection strategies (i.e., FIP, CR, and FIT) on the engine characteristics. It is observed that specific fuel consumption (BSFC) and nitrogen oxide emission (NO) increased with a decrease in brake thermal efficiency (BTE) in the case of MME100 at a base FIP of 500 bar. The volatility and viscosity (physical properties) of the MME fuel blend influenced the combustion phenomena resulting in a reduction in engine performance. The higher viscosity of the methyl ester blend restricts the fuel atomization process during the injection. Fuel injection pressure (P) was raised from 500 to 1000 bar in increments of 250 bar in the first phase to maximize the use of the MME blend. High injection pressures (1000 bar) have higher BTE (12.33%) and better combustion characteristics (2.86%) than lower fuel injection pressures (500 bar). The concentrations of smoke (3.62%), CO (15.6%), and HC (2.8%) were reduced as injection pressure was raised, owing to the better formation of the mixture and improved spray atomization. Better results were obtained by optimizing and confirming operational parameters such as compression ratio, injection pressure, and injection time. This optimum value of 1000 bar injection pressure, injection timing of 27° bTDC, and a compression ratio of 18: 1 is utilized as the operating parameter values in the subsequent experiments to improve performance and decrease emissions while utilizing MME biodiesel blends in a CRDI engine.
已对一台使用麻疯树甲酯混合燃料的共轨柴油喷射（CRDI）发动机进行了一项研究，以探讨燃油喷射策略（即喷油压力、共轨压力和喷油正时）对发动机特性的影响。观察到，在基础喷油压力为500 bar的情况下，对于MME100，随着制动热效率（BTE）的降低，特定燃油消耗（BSFC）和氮氧化物排放（NO）增加。MME燃料混合物的挥发性和粘度（物理特性）影响了燃烧现象，导致发动机性能下降。甲酯混合物的较高粘度限制了喷射过程中的燃油雾化过程。在第一阶段，燃油喷射压力（P）从500 bar提高到1000 bar，增量为250 bar，以最大限度地利用MME混合物。与较低的燃油喷射压力（500 bar）相比，高喷射压力（1000 bar）具有更高的BTE（12.33%）和更好的燃烧特性（2.86%）。由于混合物形成更好且喷雾雾化改善，随着喷射压力的提高，烟（3.62%）、CO（15.6%）和HC（2.8%）的浓度降低。通过优化和确定诸如压缩比、喷射压力和喷射时间等运行参数，获得了更好的结果。在随后的实验中，将1000 bar的喷射压力、27° bTDC的喷射正时和18:1的压缩比这一最佳值用作运行参数值，以便在CRDI发动机中使用MME生物柴油混合物时提高性能并减少排放。
