In-cylinder CO and UHC Imaging in a Light-Duty Diesel Engine during PPCI Low-Temperature Combustion

Kim, Duksang; Ekoto, Isaac; Colban, Will F.; Miles, Paul C.

doi:10.4271/2008-01-1602

Cited by 122 publications

(55 citation statements)

References 19 publications

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“…Emissions of CO were extremely low for the H-1 condition indicating that the directly-injected diesel fuel does not contribute strongly to CO emissions in fumigation combustion. This corresponds well to other published studies that show CO mostly results from incomplete combustion in the squish volume for premixed modes of diesel combustion [22]. CO was nearly the same for E-1 and G-1 at retarded diesel timing settings and for G-1, retarded timing resulted in much higher CO than for advanced timing.…”

supporting

confidence: 91%

Determining Optimal Performance in Adapting Onsite Electrical Generation Platforms to Operate on Producer Gas from Fuels of Opportunity

Rasmussen¹

2013

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supporting

confidence: 91%

Determining Optimal Performance in Adapting Onsite Electrical Generation Platforms to Operate on Producer Gas from Fuels of Opportunity

Rasmussen¹

2013

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“…This is expected as high CO is usually resulted from either low combustion temperature for the oxidation of CO to CO2 or insufficient O2 (high ϕ) to complete the conversion (Dec, 2009). Unburned hydrocarbon (UHC; not shown in figure) also has a similar behavior as seen in the study by Kim et al (2008) with high concentration at either too lean (overmixed) or too rich (undermixed) conditions, especially at low temperature. The formation of formaldehyde (CH2O) shown in Figure 1 appears at low-temperature region (<1,000 K), but at a very wide range of ϕ.…”

Section: Introductionsupporting

confidence: 54%

Low-Temperature Combustion of High Octane Fuels in a Gasoline Compression Ignition Engine

et al. 2017

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Gasoline compression ignition (GCI) has been shown as one of the advanced combustion concepts that could potentially provide a pathway to achieve cleaner and more efficient combustion engines. Fuel and air in GCI are not fully premixed compared to homogeneous charge compression ignition (HCCI), which is a completely kinetic-controlled combustion system. Therefore, the combustion phasing can be controlled by the time of injection, usually postinjection in a multiple-injection scheme, to mitigate combustion noise. Gasoline usually has longer ignition delay than diesel. The autoignition quality of gasoline can be indicated by research octane number (RON). Fuels with high octane tend to have more resistance to autoignition, hence more time for fuel-air mixing. In this study, three fuels, namely, aromatic, alkylate, and E30, with similar RON value of 98 but different hydrocarbon compositions were tested in a multicylinder engine under GCI combustion mode. Considerations of exhaust gas recirculating (EGR), start of injection, and boost were investigated to study the sensitivity of dilution, local stratification, and reactivity of the charge, respectively, for each fuel. Combustion phasing (location of 50% of fuel mass burned) was kept constant during the experiments. This provides similar thermodynamic conditions to study the effect of fuels on emissions. Emission characteristics at different levels of EGR and lambda were revealed for all fuels with E30 having the lowest filter smoke number and was also most sensitive to the change in dilution. Reasonably low combustion noise (<90 dB) and stable combustion (coefficient of variance of indicated mean effective pressure <3%) were maintained during the experiments. The second part of this article contains visualization of the combustion process obtained from endoscope imaging for each fuel at selected conditions. Soot radiation signal from GCI combustion were strong during late injection and also more intense at low EGR conditions. Soot/temperature profiles indicated only the high-temperature combustion period, while cylinder pressure-based heat release rate showed a two-stage combustion phenomenon.

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“…Similar fluorescent interference has been observed in CO measurements in engines. 7 Osborne and Frank 6 evaluated seven prospective C 2 precursor molecules, including C 2 H 2 , CH 4 , and C 2 H 4 -the three hydrocarbon species dominating the partial-oxidation products shown in Fig. 1.…”

mentioning

confidence: 99%

Atmospheric Pressure Acetylene Detection by UV Photo-Fragmentation and Induced C₂ Emission

Miles

et al. 2013

Appl Spectrosc

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Detection of C2H2 via UV photo-fragmentation, followed by monitoring the C2d3Πg–a3Πu fluorescence, is explored at atmospheric pressure and at temperatures of 295 K, 600 K, and 800 K, for excitation wavelengths 210 to 240 nm using a broadband laser source (~3 cm−1 fwhm). At the lower temperature, C2 emissions correlate closely with C2H2 Ã←X absorption bands, and the excitation spectra suggest a higher-transition probability for the v″ 4 = 2 and 3 states than for the v″ 4 = 0 and 1 states. As temperature increases, the excitation spectra exhibit a higher nonresonant background.

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In-cylinder CO and UHC Imaging in a Light-Duty Diesel Engine during PPCI Low-Temperature Combustion

Cited by 122 publications

References 19 publications

Determining Optimal Performance in Adapting Onsite Electrical Generation Platforms to Operate on Producer Gas from Fuels of Opportunity

Determining Optimal Performance in Adapting Onsite Electrical Generation Platforms to Operate on Producer Gas from Fuels of Opportunity

Low-Temperature Combustion of High Octane Fuels in a Gasoline Compression Ignition Engine

Atmospheric Pressure Acetylene Detection by UV Photo-Fragmentation and Induced C₂ Emission

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In-cylinder CO and UHC Imaging in a Light-Duty Diesel Engine during PPCI Low-Temperature Combustion

Cited by 122 publications

References 19 publications

Determining Optimal Performance in Adapting Onsite Electrical Generation Platforms to Operate on Producer Gas from Fuels of Opportunity

Determining Optimal Performance in Adapting Onsite Electrical Generation Platforms to Operate on Producer Gas from Fuels of Opportunity

Low-Temperature Combustion of High Octane Fuels in a Gasoline Compression Ignition Engine

Atmospheric Pressure Acetylene Detection by UV Photo-Fragmentation and Induced C2 Emission

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Atmospheric Pressure Acetylene Detection by UV Photo-Fragmentation and Induced C₂ Emission