Ignition and combustion characteristics of various biodiesel fuels (BDFs)

Oo, Chit Wityi; Shioji, Masahiro; NAKAO, Shinji; Dung, Nguyen Ngoc; Reksowardojo, Iman K.; Roces, Susan A.; Dugos, Nathaniel P.

doi:10.1016/j.fuel.2015.05.049

Cited by 44 publications

(12 citation statements)

References 21 publications

(45 reference statements)

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“…It can be explained that the cetane number (61.5) of PCO and viscosity (4.29) is higher than that of ULSD (see Table 1), and it leads to the compressibility of PCO fuel being lower and the combustion of PCO fuel starting faster than that of ULSD [41,43]. At middle and high engine loads (0.39 MPa and 0.52 MPa), the ROHR of BD20 is the biggest compared with ULSD and PCO, it is again verified that the influence of the oxygen content is great [43,44]. In order to comprehensively investigate the application of canola oil in a common rail diesel engine, the combustion pressure and ROHR for each test fuel are shown in Figure 4.…”

Section: Combustion Pressure and Rate Of Heat Release (Rohr)mentioning

confidence: 70%

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Application of Canola Oil Biodiesel/Diesel Blends in a Common Rail Diesel Engine

Yoon²,

Kim

et al. 2016

Applied Sciences

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Abstract:In this study, the application effects of canola oil biodiesel/diesel blends in a common rail diesel engine was experimentally investigated. The test fuels were denoted as ULSD (ultra low sulfur diesel), BD20 (20% canola oil blended with 80% ULSD by volume), and PCO (pure canola oil), respectively. These three fuels were tested under an engine speed of 1500 rpm with various brake mean effective pressures (BMEPs). The results indicated that PCO can be used well in the diesel engine without engine modification, and that BD20 can be used as a good alternative fuel to reduce the exhaust pollution. In addition, at low engine loads (0.13 MPa and 0.26 MPa), the combustion pressure of PCO is the smallest, compared with BD20 and ULSD, because the lower calorific value of PCO is lower than that of ULSD. However, at high engine loads (0.39 MPa and 0.52 MPa), the rate of heat release (ROHR) of BD20 is the highest because the canola oil biodiesel is an oxygenated fuel that promotes combustion, shortening the ignition delay period. For exhaust emissions, by using canola oil biodiesel, the particulate matter (PM) and carbon monoxide (CO) emissions were considerably reduced with increased BMEP. The nitrogen oxide (NOx) emissions increased only slightly due to the inherent presence of oxygen in biodiesel.

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Section: Combustion Pressure and Rate Of Heat Release (Rohr)mentioning

confidence: 70%

“…It depends on the temperature and pressure of the surroundings and oxygen concentration of fuel. Generally, the chemical delay is larger than the physical delay due to the chemical reactions being faster, and higher a cetane number of fuel indicates a shorter chemical delay time [42,44].…”

Section: Chemical Delaymentioning

confidence: 99%

Application of Canola Oil Biodiesel/Diesel Blends in a Common Rail Diesel Engine

Yoon²,

Kim

et al. 2016

Applied Sciences

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“…The significant difference in the ID reduction due to GO in the two fuels can be attributed to the higher surface tension of the GDB droplet compared to that of the GDD droplet (see Table ). A large surface tension (ie, strong intermolecular layer) along the surface of the GDB droplet hinders the evaporation process because of the strong attraction between the polar GO nanoparticles and polar biodiesel molecules . On the other hand, the polar nature of GO (ie, high electronegativity particles with the presence of oxygen) weakens the intermolecular forces of the nonpolar hydrocarbons of diesel (ie, low electronegativity molecules due to the absence of oxygen), thus resulting in a decrease in viscosity for the GDD fuel.…”

Section: Resultsmentioning

confidence: 99%

Improving combustion characteristics of diesel and biodiesel droplets by graphite oxide addition for diesel engine applications

et al. 2017

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Summary Graphite oxide (GO) is an important member of the graphene family of carbon nanomaterials with remarkable physical, chemical, and thermal properties. We conducted an experimental investigation on the combustion characteristics of diesel and biodiesel droplets dosed with 0.1% GO. The fuels were tested by a single droplet combustion experiment in which the temporal variation in the burning behavior of a suspended droplet was captured using a high‐speed camera. Numerical analysis of the combustion data suggests that the addition of GO in both fuels resulted in shortened ignition delay (by up to 38.2%), increased burn‐rate constant (by up to 29.4%), lowered peak temperature (by up to 7.8%), and shortened burning period (by up to 11.6%). To illustrate, the burn‐rate constant increased from 0.68 to 0.88 mm2/second, and the burning period reduced from 2.7 to 2.2 seconds when GO was dosed in diesel. By contrast, the ignition delay and peak temperature both decreased from 1.6 to 1.4 seconds and 659 to 611 K, respectively, when GO was added in biodiesel. Our results suggest that the fuel additive–induced benefits could effectively reduce emissions and improve fuel consumption for diesel engine applications.

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“…Furthermore, as investigated by [33], one of the factors that could affect ignition delay and subsequent combustion processes is the fuel cetane number. Biodiesel fuels have higher cetane number as presented in Table 2 and this could have facilitated its shorter ignition delay when compared to diesel.…”

Section: Effect Of Ambient Temperature On Ignition Delaymentioning

confidence: 99%

Effects of ambient temperature and injection pressure on biodiesel ignition delay

Jaat¹,

Khalid²,

Andsaler³

et al. 2017

J. MECH. ENG. SCI.

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Biodiesels are promoted as alternative fuels due to their potential to reduce dependency on fossil fuels. The main problem in diesel combustion chamber design is to understand the importance of interaction phenomenon between fuel spray and surrounding gas prior to ignition. Rapid compression machine (RCM) is widely used to acquire experimental insights into fuel autoignition at conditions relevant to the current and future combustion technologies. An experimental study of the measurement of ignition delay characteristics of diesel and blended biodiesel fuels in the RCM was carried out. The objective of this study is to investigate the effects of various ambient temperature, Ti and injection pressure, Pinj on ignition delay with different fuels used. This present study used the ignition delay of 5vol%, 10vol%, and 15vol% blending of palm oil methyl ester with a standard diesel as fuels in diesel engines called as B5, B10, and B15. The diesel fuel was blended with the biodiesel fuels at different fuel mixture blends. The injection pressure chosen was from 80 MPa to 140 MPa while an ambient temperature of RCM varied from 750 K to 950 K. The results showed that for all tested fuels, the reduction in ignition delay increased with the increase in ambient temperature and injection pressure. The palm oil biodiesel had higher density, viscosity, and cetane number, facilitated the shortest ignition delay when compared to the diesel fuel under all ambient temperatures and injection pressures. The fuel oxygen content in the biodiesel fuel also played a greater role in decreasing the ignition delay.

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Ignition and combustion characteristics of various biodiesel fuels (BDFs)

Cited by 44 publications

References 21 publications

Application of Canola Oil Biodiesel/Diesel Blends in a Common Rail Diesel Engine

Application of Canola Oil Biodiesel/Diesel Blends in a Common Rail Diesel Engine

Improving combustion characteristics of diesel and biodiesel droplets by graphite oxide addition for diesel engine applications

Effects of ambient temperature and injection pressure on biodiesel ignition delay

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