Sources of Hydrocarbon Emissions from Low-Temperature Premixed Compression Ignition Combustion from a Common Rail Direct Injection Diesel Engine

Han, Manbae; Assanis, Dennis N.; Bohac, Stanislav V.

doi:10.1080/00102200802530066

Cited by 61 publications

(19 citation statements)

References 11 publications

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“…This could be attributed to two effects: over-mixing, where the mixture is too lean to burn, and flame quenching in the expansion stroke. This result is consistent with the work of Han et al [34] and Colban el al. [35].…”

Section: Effect Of Exhaust Gas Recirculation (Egr) On Diesel Pcci Comsupporting

confidence: 83%

Effects of Compression Ratio and Simulated EGR on Combustion Characteristics and Exhaust Emissions of a Diesel PCCI Engine

Kiplimo

Tomita

Kawahara

et al. 2011

JTST

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The effects of compression ratio and simulated exhaust-gas recirculation (EGR) on combustion characteristics and exhaust emissions of a diesel PCCI engine were investigated using a single-cylinder test engine. Tests were carried out under constant speed with various compression ratios and EGR rates. Exhaust emissions and in-cylinder pressure were measured for all experimental conditions. Analyses based on engine performance and exhaust emissions were conducted. An optimum compression ratio that provided better indicated thermal efficiency and IMEP while yielding lower emissions of smoke, HC, and CO, and reasonable NO x without EGR was identified. High rates of EGR led to the simultaneous reduction of NO x and soot emissions due to a lower combustion temperature compared with conventional diesel combustion, with a slight penalty in HC and CO.

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Section: Effect Of Exhaust Gas Recirculation (Egr) On Diesel Pcci Comsupporting

confidence: 83%

Effects of Compression Ratio and Simulated EGR on Combustion Characteristics and Exhaust Emissions of a Diesel PCCI Engine

Kiplimo

Tomita

Kawahara

et al. 2011

JTST

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show abstract

“…Kashdan et al found liquid fuel film caused by spray impingement on piston bowl is a primary source of HC emissions in narrow-angle early-injection LTC [7][8][9][10][11][12][13][14][15]. In contrast, for late-injection LTC, the over-mixing and bulk quenching mechanisms are believed to be dominant for increased HC emissions.…”

Section: Hc and Co Emissions In Premixed Low-temperature Diesel Combumentioning

confidence: 88%

HC and CO emissions of premixed low-temperature combustion fueled by blends of diesel and gasoline

Han

Ickes

Bohac

et al. 2012

Fuel

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“…The UHC was calculated as the difference between the THC measurement and the sum of the non-fuel species detected with the FT-IR on a C 1 basis. It has been shown previously and is assumed in this work that the bulk of gas phase UHC consists of unburned fuel escaping the combustion process (Han et al 2009). …”

Section: Emissions Measurement and Analysismentioning

confidence: 99%

Condensational Growth of Particulate Matter from Partially Premixed Low Temperature Combustion of Biodiesel in a Compression Ignition Engine

Northrop

Madathil

Bohac

et al. 2011

Aerosol Science and Technology

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Condensational growth is not typically assumed to be significant compared with adsorption for conversion of unburned hydrocarbons in the exhaust of diesel engines to the particulate phase. However, when partially premixed low temperature combustion (LTC) modes designed to simultaneously reduce soot and NO X emissions are implemented, unburned hydrocarbon (UHC) concentrations in the exhaust are an order of magnitude higher than for conventional combustion modes, increasing the likelihood of gas to particle conversion by condensation. In this work, two LTC operating conditions are compared with conventional diesel combustion using a multi-cylinder direct-injection diesel engine using low-sulfur fuel, a soy-based biodiesel and a 50% by volume biodiesel blend. Gaseous emissions of unburned hydrocarbons were measured and particulate samples were taken using a partial-flow dilution tunnel. Gravimetric analysis of the collected filters, Soxhlet extraction of particulate and speciation using GC-FID was performed for all operating conditions. Elemental carbon (EC) emissions were measured using a thermal optical analyzer and particle size distribution was analyzed using a differential mobility spectrometer. For increasing biodiesel concentration in the fuel, mass emissions of both EC and UHC decreased for all combustion modes compared with petroleum diesel. However, for biodiesel use in LTC modes of operation, particulate mass significantly increased following exhaust dilution. Low vapor pressure methyl esters found in the exhaust of biodiesel LTC increases heterogeneous condensation onto soot particles in the exhaust compared with unburned species from petroleum diesel fuel operation. A model estimating this condensation mechanism accurately predicts the exper-

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Sources of Hydrocarbon Emissions from Low-Temperature Premixed Compression Ignition Combustion from a Common Rail Direct Injection Diesel Engine

Cited by 61 publications

References 11 publications

Effects of Compression Ratio and Simulated EGR on Combustion Characteristics and Exhaust Emissions of a Diesel PCCI Engine

Effects of Compression Ratio and Simulated EGR on Combustion Characteristics and Exhaust Emissions of a Diesel PCCI Engine

HC and CO emissions of premixed low-temperature combustion fueled by blends of diesel and gasoline

Condensational Growth of Particulate Matter from Partially Premixed Low Temperature Combustion of Biodiesel in a Compression Ignition Engine

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