الفهرس 
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Abstract
The aim of this study is to investigate the effect of adding aluminum oxide (Al2O3) and ferrocene (Fe(C5H5)2) nanoparticles in different dosages as fuel additives in a compression ignition (CI) engine, fueled by neat diesel and blends of diesel and biodiesel. The investigations include studying the effect of nanoparticles on engine performance, combustion characteristics and exhaust gases characteristics. Experiments were conducted using a 4-stroke, single cylinder, air-cooled diesel engine at constant engine speed while varying the load. The nanoparticles were dispersed in the base fuel with the aid of ultrasonication process. The results revealed that among the different cases, adding Al2O3 or Fe(C5H5)2 nanoparticles led to an improvement in engine performance and exhaust gases characteristics. The improvement extent was directly affected by the dosing level of dispersed nanoparticles in base fuel. The highest improvement when using Al2O3 nanoparticles was achieved at dosage of 100 mg/ liter of diesel, reaching an increase of 11.48% in thermal efficiency and 16.67% reduction in fuel consumption, In case of Fe(C5H5)2, the optimum dosage was 250 mg/ liter of diesel, which led to an increase of 7.5% in thermal efficiency and 9.34% reduction in fuel consumption. The addition of nanoparticles to biodiesel blends also offered very promising results in improving performance and decreasing NOx emissions.