Diesel Combustion Cetane Number Effects

Olree, Robert M.; Lenane, D. L.

doi:10.4271/840108

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…The preferred method to improve the cetane number for these later distillates is to add specialty chemicals known as cetane improvers. Engine responses from chemical cetane numbers (cetane number achieved with additives) are essentially the same as responses from natural cetane numbers (Olree and Lenane, 1984).…”

Section: Introductionmentioning

confidence: 89%

“…Since 1960, cetane improvers have found increasing utilization in diesel fuels due to both increasing demands for diesel relative to other petroleum products and increased processing of heavier crude. The neat cetane number (CN) of diesel has decreased from about 50 CN in 1962to 45 CN in 1982(Olree and Lenane, 1984. Today, much of the diesel cannot meet the 45 CN requirements and is piped at >40 CN specifications.…”

Section: Introductionmentioning

confidence: 99%

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Cetane-Improver Analysis and Impact of Activation Energy on the Relative Performance of 2-Ethylhexyl Nitrate and Tetraethylene Glycol Dinitrate

Suppes¹,

Ying²,

Rome³

et al. 1997

Ind. Eng. Chem. Res.

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A testing procedure has been developed to evaluate the effectiveness of cetane improvers for improving the ignition properties of diesel fuels. Among the factors considered in developing this procedure were the availability, characterization, and toxicity of the base fuel, the ease of measurement of the data, and the sensitivity of the analysis. This particular method has several advantages over previously used methods and is suitable for obtaining fundamental information on performance trends. Performance data are reported for 2-ethylhexyl nitrate (EHN) and tetraethylene glycol dinitrate (TEGDN). The data show that inconsistencies in reported performances for these cetane improvers can be explained by different apparent activation energies for the respective ignition processes as well as the lower solubility of TEGDN.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Cetane-Improver Analysis and Impact of Activation Energy on the Relative Performance of 2-Ethylhexyl Nitrate and Tetraethylene Glycol Dinitrate

Suppes¹,

Ying²,

Rome³

et al. 1997

Ind. Eng. Chem. Res.

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show abstract

“…Decreasing ignition delay with the increasing cetane number at a given ambient condition is expected based on previous experiments investigating the effect of the cetane number on ignition delay . Olree and Lenane tested blended diesel fuels, with and without cetane improvers, with cetane numbers between 35 and 54 in one cylinder of a 6.2 L V8 engine at various engine speeds and loads, and saw the same trend . The fuels used in the study had various fuel properties apart from the cetane number.…”

Section: Results and Discussionmentioning

confidence: 67%

“…12 Olree and Lenane tested blended diesel fuels, with and without cetane improvers, with cetane numbers between 35 and 54 in one cylinder of a 6.2 L V8 engine at various engine speeds and loads, and saw the same trend. 26 The fuels used in the study had various fuel properties apart from the cetane number. The authors noted a linear relation between ignition delay, measured in crank angle degrees (CAD), and the cetane number for a given inlet air temperature, load, and engine speed.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Cetane Number on Jet Fuel Spray Ignition at High-Temperature and -Pressure Conditions

et al. 2020

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This study investigates the impact of the fuel cetane number on the ignition and combustion dynamics of a high-pressure jet fuel spray under realistic diesel engine conditions. Under the desirable single-fuel concept for U.S. military applications, jet fuels would be used in traditional diesel engines. However, there is no cetane specification for such fuels, and substantial variation has been observed. To better understand the ignition and combustion dynamics of jet fuels subjected to diesel conditions, a series of test fuels have been constructed with varying cetane numbers between 30 and 55. Schlieren and chemiluminescence imaging were performed on the ignition process of four cetane number fuels, 30, 40, 50, and 55, at three ambient pressure conditions 4, 6, and 8 MPa. Fuel breakdown prior to ignition is tracked, and the size of the ignition kernel is extracted from the Schlieren imaging. Hydroxyl radical (OH) chemiluminescence intensity is used to estimate the heat release rate. Ignition and initial fuel breakdown delay from ignition were found to typically decrease with the increasing cetane number. The decrease in ignition delay is smaller at higher ambient pressures. Early timescale kernel growth was found to be dominated by the cetane number with a higher cetane number leading to faster kernel growth. Growth at later timescales is determined by injection pressure. The effect of cetane number decreases with increasing ambient pressure. The estimated heat release rate from OH chemiluminescence shows increasing heat release with the increasing cetane number at 4 MPa ambient, but there is no clear relationship at higher pressures.

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“…In this work, where we have more than one species in the multicomponent fuel, the different fuel species will contribute to the formation of this trace species and at different rates. In our model, we assume that the activation temperature in the rate expression that yields the trace species from each component is inversely proportional to the cetane number, CN, of the component [13,14]. The model for the species is then Eq.…”

mentioning

confidence: 99%

Improved Modeling of Drop Vaporization and Combustion in Sprays

Abraham¹

2001

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Diesel Combustion Cetane Number Effects

Cited by 19 publications

References 7 publications

Cetane-Improver Analysis and Impact of Activation Energy on the Relative Performance of 2-Ethylhexyl Nitrate and Tetraethylene Glycol Dinitrate

Cetane-Improver Analysis and Impact of Activation Energy on the Relative Performance of 2-Ethylhexyl Nitrate and Tetraethylene Glycol Dinitrate

Effect of the Cetane Number on Jet Fuel Spray Ignition at High-Temperature and -Pressure Conditions

Improved Modeling of Drop Vaporization and Combustion in Sprays

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