The individual effects of cetane number, oxygen content or fuel properties on the ignition delay, combustion characteristics, and cyclic variation of a turbocharged CRDI diesel engine – Part 1

Labeckas, Gvidonas; Slavinskas, Stasys; Kanapkienė, Irena

doi:10.1016/j.enconman.2017.06.050

Cited by 55 publications

(18 citation statements)

References 59 publications

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“…Bioethanol contains about 3.5 times more oxygen than WB. And this increases the combustion speed of the WBE [25]. Thus, the combustion duration of WBE is shorter.…”

Section: Combustion Analysesmentioning

confidence: 96%

Experimental investigation of the cetane improver and bioethanol addition for the use of waste cooking oil biodiesel as an alternative fuel in diesel engines

Örs

2020

J Braz. Soc. Mech. Sci. Eng.

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In this study, bioethanol produced from sugar beet and biodiesel produced from waste cooking oils was blended with each other in the volumetric rates to be 20% and 80%, respectively. Cetane improver (di-tert-butyl peroxide) was added into blend fuel in 1-2-3% as volumetric. The obtained blends were used as a fuel in the diesel engine which is single-cylinder, directinject, four-stroke. The tests were conducted under four different engine loads (25%, 50%, 75% and 100%) and 1400 rpm engine speed. The test results showed that brake-specific fuel consumption was decreased up to 15.5% thanks to the addition of cetane improver, although biodiesel and bioethanol increased brake-specific fuel consumption by 16.1% and 27.54%, respectively. However, brake thermal efficiency values were increased up to 9.44% with both biodiesel and cetane improver added blend fuels, while brake thermal efficiency was decreased by 3.88% with bioethanol addition. The more compatible combustion characteristics with that of diesel fuel have been obtained due to especially the increase in cetane number. The use of biofuels increased both maximum cylinder pressure and heat release rate. While, with the cetane improver addition, a decrease in CO, HC and smoke opacity values was observed up to 22.5%, 17.44% and 24.44%, respectively, CO 2 , NO X and exhaust gas temperature values were increased up to 19.55%, 5% and 15.22%, respectively, according to bioethanol blend fuel. Keywords Waste cooking oil • Biodiesel • Bioethanol • Cetane improver • Diesel engine List of symbols BSFC Brake-specific fuel consumption BTE Brake thermal efficiency CA Crank angle CA50 Crank angle point for 50% accumulated HRR CA90 Crank angle point for 90% accumulated HRR CBD Cotton biodiesel cDF Conventional diesel fuel CI Cetane index CNI Cetane improver CO Carbon monoxide CO 2 Carbon dioxide DI Direct injection DTBP Di-tert-butyl peroxide

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“…Bioethanol contains about 3.5 times more oxygen than WB. And this increases the combustion speed of the WBE [25]. Thus, the combustion duration of WBE is shorter.…”

Section: Combustion Analysesmentioning

confidence: 96%

Experimental investigation of the cetane improver and bioethanol addition for the use of waste cooking oil biodiesel as an alternative fuel in diesel engines

Örs

2020

J Braz. Soc. Mech. Sci. Eng.

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“…While the reduction of the auto-ignition delay with fuel blend involving biodiesel B4 can be reasonably attributed to the fact that the air-fuel mixture involving biodiesel is a more heterogeneous and some part of biodiesel-oxygen is in double bounds with radicals that increases the oxidation chances. For these reasons, the fuels involving ethanol almost-always suggest the auto-ignition delay period longer than biodieseloxygenated blends containing the same fuel-oxygen mass content with the differences between the two fuel groups being higher the higher the speed of an engine [10]. The scientists Shropshire and Goering among the first researchers noticed this phenomenon made by the ethanol injected into the intake manifold [11].…”

Section: The Engine Test Results and Analysismentioning

confidence: 99%

Исследование влияние кислорода в топливе различного происхождения на процесс сгорания в дизельном двигателе CRDI с тyрбонаддувом

2020

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В статье приводится анализ влияния кислорода в топливе различного происхождения на процессы самовоспламенения и сгорания в дизельном двигателе CRDI с турбонаддувом при средних эффективных давлениях 1.24, 1.37 и 1.40 MПa развиваемых при общих коэффициентах избытка воздуха λ = 1.30, 1.25 и 1.20 на соответствующих частотах вращения 1500, 2000 и 2500 мин-1. Экспериментальные исследования и численное моделирование воздействия биотопливного кислорода на характеристики процесса сгорания выполнены при выше указанных средних эффективных давлениях и условиях работы, наиболее характерных для турбонаддувного дизеля. Оценка качественных и количественных изменений в характеристиках процесса сгорания выполнена с учетом химических и физических свойств смесей дизельного топлива и гидрированное возобновляемого дизельного топлива (HRD), обогащенных в одинаковых процентах по массе 0 (E0/B0), 0.91 (E1/B1), 1.81 (E2/B2), 2.71 (E3/B3), 3.61 (E4/B4) и 4.52 wt% (E5/B5) кислородом различного происхождения, - безводным (200 proof) этанолом (E) или метиловым эфиром рапсового масла (B) при достаточно высоком в обеих топливных группах цетановом числе 55,5. Сравнительный анализ в количественных изменениях периода задержки самовоспламенения предварительной порций топлива, специфического угла сгорания MBF 50, максимальной скорости тепловыделения (HRRmax) и максимального давления в цилиндре (pmax) в итоге применения кислородом обогащенных топливных смесей E1-E5 или B1-B5 выполнен с учетом соответствующих значений параметров замеренных при работе двигателя на нормальной смеси (ноль кислорода) E0/B0 с целью выявить потенциальные тенденции развития процесса сгорания.Ключевые слова: Дизельный двигатель; экологически чистое топливо HRD; топливные смеси, обогащенные этанолом и биодизелем; самовоспламенение; процесс сгорания; тепловыделение; максимальное давление в цилиндре.

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“…In this study, at low and moderate engine speeds (1500 to 2500 rpm), the PHRR of the lower percentage of COB-diesel blends were found to be higher than that of diesel. This appears to be the effect of a higher oxygen content in the blends that might provide better combustion to release higher heat [56]. A study by Tesfa et al also reported slightly higher heat release rates with higher-load biodiesel blends than diesel in a turbocharged diesel engine running at a fixed 1300 rpm, possibly due to additional oxygen molecules in the biodiesel [57].…”

Section: Heat Release Rate (Hrr) At Various Engine Speedmentioning

confidence: 96%

Study of Performance, Emissions, and Combustion of a Common-Rail Injection Engine Fuelled with Blends of Cocos nucifera Biodiesel with Diesel Oil

Teoh

How

et al. 2020

Processes

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Renewable alternatives to fossil fuels, such as biodiesel, are necessary to lessen emission of greenhouse gases that are causing climate change. Using a high-pressure, medium-duty, common-rail, turbocharged four-cylinder diesel engine, this work studies the effect of adding Cocos nucifera biodiesel to conventional diesel on exhaust emissions, engine performance, and combustion characteristics. An analysis and characterization of the key physicochemical properties of diesel, biodiesel, and biodiesel–diesel blends were carried out. The engine was fuelled with pure petroleum diesel and blended diesel containing a 10%, 20%, 30%, and 50% volume of coconut oil at full throttle and six different speed settings, respectively. The results showed relatively close physicochemical properties between the biodiesel blend and conventional petroleum fuel. Observations made over the entire speed range indicated that a higher coconut oil biodiesel (COB) content lowers the torque and brake power compared to diesel. In the case of engine exhaust gas, a reduction in carbon monoxide (CO) and smoke emissions were observed. Notably, COB50 gives out the highest nitrogen oxides (NOx) but it is raised even for other blends. The experimental results also demonstrated that a higher COB content achieves a lower peak pressure while the peak heat release rate (PHRR) was lower than that of conventional diesel as the speed of the engine increases.

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The individual effects of cetane number, oxygen content or fuel properties on the ignition delay, combustion characteristics, and cyclic variation of a turbocharged CRDI diesel engine – Part 1

Cited by 55 publications

References 59 publications

Experimental investigation of the cetane improver and bioethanol addition for the use of waste cooking oil biodiesel as an alternative fuel in diesel engines

Experimental investigation of the cetane improver and bioethanol addition for the use of waste cooking oil biodiesel as an alternative fuel in diesel engines

Исследование влияние кислорода в топливе различного происхождения на процесс сгорания в дизельном двигателе CRDI с тyрбонаддувом

Study of Performance, Emissions, and Combustion of a Common-Rail Injection Engine Fuelled with Blends of Cocos nucifera Biodiesel with Diesel Oil

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