Experimental Investigation of Single and Two-Stage Ignition in a Diesel Engine

Jansons, Marcis; Brar, A. S.; Estefanous, Fadi; Florea, Radu; Taraza, Dinu; Henein, Naeim A.; Bryzik, Walter

doi:10.4271/2008-01-1071

Cited by 26 publications

(4 citation statements)

References 41 publications

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“…As such, it limits the increase in oxidation reaction rates and behaves as a barrier to auto-ignition (Yamada et al, 2008). While the LTHR regime limits the initial reaction stages, the released chemical energy increases the in-cylinder temperature and produces intermediate radicals that are needed for the initiation of the following high temperature (main) combustion regime (Jansons et al, 2008;Musculus, 2006).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Low Temperature Diesel Combustion Processes

Cong

McTaggart-Cowan

Garner

et al. 2011

Combustion Science and Technology

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Low Temperature Diesel Combustion Processes

Cong

McTaggart-Cowan

Garner

et al. 2011

Combustion Science and Technology

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“…JP-8 (31) fuel experienced the low temperature combustion regime before the start of the high temperature combustion reactions. From literature it can be learned that other researchers have observed NTC behavior of fuels with investigations involving EGR [10,11]. In this investigation, no EGR is used, yet JP-8 (31) exhibited NTC behavior.…”

Section: Effect Of Lowering Gas Temperature On the Auto-ignition Of Hmentioning

confidence: 86%

Effect of Inlet Air Temperature on Auto-Ignition of Fuels With Different Cetane Number and Volatility

Jayakumar

Zheng

Joshi

et al. 2011

ASME 2011 Internal Combustion Engine Division Fall Technical Conference

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This paper investigates the effect of air inlet temperature on the auto-ignition of fuels that have different CN and volatility in a single cylinder diesel engine. The inlet air temperature is varied over a range of 30°C to 110°C. The fuels used are ultra-low-sulfur-diesel (ULSD), JP-8 (two blends with CN 44.1 & 31) and F-T SPK. Detailed analysis is made of the rate of heat release during the ignition delay period, to determine the effect of fuel volatility and CN on the auto-ignition process. A STAR-CD CFD model is applied to simulate the spray behavior and gain more insight into the processes that immediately follow the fuel injection including evaporation, start of exothermic reactions and the early stages of combustion. The mole fractions of different species are determined during the ignition delay period and their contribution in the auto-ignition process is examined. Arrhenius plots are developed to calculate the global activation energy for the auto-ignition reactions of these fuels. Correlations are developed for the ID and the mean air temperature and pressure.

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“…The apparent rate of heat release (ARHR) is calculated by a MATLAB subroutine using the analysis provided by Heywood [9] and is shown normalized by the engine displacement. A more detailed engine and instrumentation description has been reported in an earlier publication [10].…”

Section: Introductionmentioning

confidence: 99%

Soot Evolution With Cyclic Crank-Angle-Resolved Two-Color Thermometry in an Optical Diesel Engine Fueled With Biodiesel Blend and ULSD

Zha

Florea

Jansons

2012

Journal of Engineering for Gas Turbines and Power

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Biodiesel is a desirable alternative fuel for the diesel engine due to its low engine-out soot emission tendency. When blended with petroleum-based diesel fuels, soot emissions generally decrease in proportion to the volume fraction of biodiesel in the mixture. While comparisons of engine-out soot measurements between biodiesel blends and petroleumbased diesel have been widely reported, in-cylinder soot evolution has not been experimentally explored to the same extent. To elucidate the soot emission reduction mechanism of biodiesel, a single-cylinder optically-accessible diesel engine was used to compare the in-cylinder soot evolution when fueled with ultra-low sulfur diesel (ULSD) to that using a B20 biodiesel blend (20% vol.lvol. biodiesel ASTM D6751-03A). Soot temperature and KL factors are simultaneously determined using a novel two-color optical thermometry technique implemented with a high-speed CMOS color camera having wide-band Bayer filters. The crank-angle resolved data allows quantitative comparison of the rate of in-cylinder soot formation. High-speed spray images show that B20 has more splashing during spray wall impingement than ULSD, distributing rebounding fuel droplets over a thicker annular ring interior to the piston bowl periphery. The subsequent soot luminescence is observed by high-speed combustion imaging and soot temperature and KL factor measurements. B20 forms soot both at low KL magnitudes over large areas between fuel jets, and at high values among remnants of the fuel spray, along its axis and away from the bowl edge. In contrast, ULSD soot luminescence is observed exclusively as pool burning on the piston bowl surfaces resulting from spray wall impingement. The soot KL factor evolution during B20 combustion indicates earlier and significantly greater soot formation than with ULSD. B20 combustion is also observed to have a greater soot oxidation rate, which results in lower late-cycle soot emissions. For both fuels, higher fuel injection pressure led to lower late-cycle soot KL levels. The apparent rate of heat release (ARHR) analysis under steady skip-fire conditions indicates that B20 combustion is less sensitive to wall temperature than that observed with ULSD due to a lesser degree of pool burning. B20 was found to have both a shorter ignition delay and shorter combustion duration than ULSD.

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Experimental Investigation of Single and Two-Stage Ignition in a Diesel Engine

Cited by 26 publications

References 41 publications

Experimental Investigation of Low Temperature Diesel Combustion Processes

Experimental Investigation of Low Temperature Diesel Combustion Processes

Effect of Inlet Air Temperature on Auto-Ignition of Fuels With Different Cetane Number and Volatility

Soot Evolution With Cyclic Crank-Angle-Resolved Two-Color Thermometry in an Optical Diesel Engine Fueled With Biodiesel Blend and ULSD

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