In the present study, the effects of adding of cerium oxide (CeO2) nanoparticle additive as a fuel additive to a palm oil biodiesel-diesel fuel blend on engine performance, and exhaust emissions were studied in a single cylinder four stroke diesel engine under different torque conditions. The test fuels used were fossil diesel fuels, B20 blend biodiesel (as 20% biodiesel and 80% diesel) with cerium oxide (CeO2) nanoparticle additive (30ppm, 60ppm, 90ppm and 120ppm). The experimental results demonstrated that B20 blend biodiesel at 90ppm of CeO2 nanoparticles additive found significant reduction emissions nitrogen oxide (NOX), carbon dioxide (CO), unburnt hydrocarbons (UBHC) and smoke. However, brake specific fuel consumption (BSFC) is decreased with significant from increased brake thermal efficiency (BTE) by doping of CeO2 from 30ppm to 90ppm. B20 biodiesel blend with 90ppm of CeO2 nanoparticles additive as optimum blend out of the test blends.
The present energy scenario hydrogen fuel plays a dominant role in the power generation. Due to its unique characteristics of an extensive range of flammability, high flame speed, and diffusivity. In this present investigation, the diesel engine is converted into dual-fuel mode devoid of major conversions of the engine. The tests are performed on a dual-fuel mode and investigated the efficiency, emissions, and combustion features of the diesel engine. In the present context, hydrogen and biogas are injected from the inlet manifold as subsidiary fuel and diesel are injected as pilot fuel. The gaseous fuel injected in two different flow rates they are, 3 litres per minute (lpm), and 4lpm. The results from the experimentation revealed that the diesel with 4 lpm of hydrogen shows the 31.11 % enhancement of brake thermal efficiency but it shows 4.14% higher NO X emissions when compared with the pure diesel. But it shows. At the same time diesel with 4 lpm of Biogas exhibits 15.90% enhancement of brake thermal efficiency and 8.96% decrease in the NO X emissions in contrast to that of the single-mode of fuel with diesel.
In the present research a diesel engine has been converted to dual fuel mode, injecting hydrogen and biogas as secondary fuel and the tests were conducted in dual fuel mode to evaluate the performance, emissions and combustion parameters of the engine. Diesel as a pilot fuel, hydrogen and biogas as a secondary fuel were injected from the inlet manifold. The hydrogen and the biogas which is a gaseous fuel were injected at 5 liters per minute (lpm) and the tests were conducted separately. From these tests, it was noted that there is an enhancement of 27.28% in brake thermal efficiency (BTE) and increment of 10.70% in NOX emissions for diesel with 5 lpm hydrogen compared with diesel fuel under single fuel mode. Also, it was noted that the reduction in BTE was around 36.50% and NOX emissions about 15.68 % for diesel with 5 lpm biogas when compared with diesel fuel under single fuel mode.
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