Cycle-to-cycle variations of NO emissions in diesel engines under long ignition delay conditions

Kyrtatos, Panagiotis; Zivolic, Antonio; Brückner, Clemens; Boulouchos, Konstantinos

doi:10.1016/j.combustflame.2016.12.025

Cited by 21 publications

(5 citation statements)

References 34 publications

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“…The cycle of unrepeatability influences emissions variation as well. In the paper [30], results are presented of assessment of cyclic variations on NO emissions of a direct injection diesel engine. Ono of statements was that the intensity of the pressure fluctuations increases with increasing ignition delay.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Combustion Stability of Diesel-Methanol and Diesel-Ethanol in a Dual Fuel Engine

et al. 2019

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The co-combustion of diesel with alcohol fuels in a compression ignition dual fuel engine is one of the ways of using alternative fuels to power combustion engines. Scientific explorations in this respect should not only concern the combustion process in one engine cycle, which is most often not representative for a longer engine life, but should also include an analysis of multiple cycles, which would allow for indicating reliable parameters of engine operation and its stability. This paper presents experimental examinations of a CI engine with a dual fuel system, in which co-combustion was performed for diesel and two alcohol fuels (methanol and ethanol) with energy contents of 20%, 30%, 40% and 50%. The research included the analysis of the combustion process and the analysis of cycle-by-cycle variation of the 200 subsequent engine operation cycles. It was shown that the presence and increase in the share of methanol and ethanol used for co-combustion with diesel fuel causes an increase in ignition delay and increases the heat release rate and maximum combustion pressure values. A larger ignition delay is observed for co-combustion with methanol. Based on changes in the coefficient of variation of the indicated mean effective pressure (COVIMEP) and the function of probability density of the indicated mean effective pressure (f(IMEP)), prepared for a series of engine operation cycles, it can be stated that the increase in the percentage of alcohol fuel used for co-combustion with diesel fuel does not impair combustion stability. For the highest percentage of alcohol fuel (50%), the co-combustion of diesel with methanol shows a better stability.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Combustion Stability of Diesel-Methanol and Diesel-Ethanol in a Dual Fuel Engine

et al. 2019

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“…[ 104 ] The cyclic variation of the fuel in an engine can be studied by finding the coefficient of variation, and it has been recommended by many researchers in the past. [ 105 ] The standard deviation of the Diesel, C100, C100C10, C100C20, J100, J100C10, and J100C20 are 0.79, 0.511, 0.64, 0.68, 0.84, 0.89, and 0.88 bar, respectively, at full load conditions. The coefficient of variance (COV) of diesel, C100, C100C10, C100C20, J100, J100C10, and J100C20 is 1.12%, 0.834%, 0.94%, 0.94%, 1.24%, 1.23%, and 1.19 %, respectively, at full load conditions.…”

Section: Resultsmentioning

confidence: 99%

Energy, Exergy, and Emission Analysis of Biofuels in Compression Ignition Engine with Camphor Oil as Premixing Fuel

Gurusamy,

Ponnusamy,

Varuvel

2023

Energy Tech

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This article aims to study the impact of camphor oil premixing with intake air on compression ignition (CI) engine characteristics powered with jatropha oil and cottonseed oil. The experiment is conducted on the direct injection compression engine attached to the premixing setup. The investigation reveals that premixing of camphor oil with cottonseed oil and jatropha oil escalates the thermal brake efficiency to 35.02% and 33.62% and brings down the brake‐specific energy consumption to 10.27 and 10.70 kJ kWh−1. At all loading conditions, the premixing of camphor oil and the rise of camphor oil in premixing proportions increase the volumetric efficiency and cut the exhaust gas temperature. 20% premixing of camphor oil with cottonseed oil and jatropha oil drops the smoke opacity emissions by 22.23% and 11.86% and NO emission by 23.27% and 14.59%, respectively, at full load conditions. Further, it shows a 27.60% and 21.14% hike in CO emissions and a 31.34% and 31.87% hike in HC emissions at full load conditions. The in‐cylinder pressure, heat release rate, and mean gas temperature increase with increasing the energy share of camphor oil in premixing. Overall, the premixing of camphor oil shows better CI engine attributes except HC and CO emissions.

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“…The cyclic variability effects on emissions have started recently to attract much attention, with the aim to determine their variation [14,39]. The work here focuses on NO and CO emissions, which are the main pollutants for SI engines.…”

Section: Cyclic Variability Of Emissionsmentioning

confidence: 99%

A Fast CFD-Based Methodology for Determining the Cyclic Variability and Its Effects on Performance and Emissions of Spark-Ignition Engines

Kosmadakis

Rakopoulos

2019

Energies

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A methodology for determining the cyclic variability in spark-ignition (SI) engines has been developed recently, with the use of an in-house computational fluid dynamics (CFD) code. The simulation of a large number of engine cycles is required for the coefficient of variation (COV) of the indicated mean effective pressure (IMEP) to converge, usually more than 50 cycles. This is valid for any CFD methodology applied for this kind of simulation activity. In order to reduce the total computational time, but without reducing the accuracy of the calculations, the methodology is expanded here by simulating just five representative cycles and calculating their main parameters of concern, such as the IMEP, peak pressure, and NO and CO emissions. A regression analysis then follows for producing fitted correlations for each parameter as a function of the key variable that affects cyclic variability as has been identified by the authors so far, namely, the relative location of the local turbulent eddy with the spark plug. The application of these fitted correlations for a large number of engine cycles then leads to a fast estimation of the key parameters. This methodology is applied here for a methane-fueled SI engine, while future activities will examine cyclic variations in SI engines when fueled with different fuels and their mixtures, such as methane/hydrogen blends, and their associated pollutant emissions.

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Cycle-to-cycle variations of NO emissions in diesel engines under long ignition delay conditions

Cited by 21 publications

References 34 publications

Comparative Analysis of the Combustion Stability of Diesel-Methanol and Diesel-Ethanol in a Dual Fuel Engine

Comparative Analysis of the Combustion Stability of Diesel-Methanol and Diesel-Ethanol in a Dual Fuel Engine

Energy, Exergy, and Emission Analysis of Biofuels in Compression Ignition Engine with Camphor Oil as Premixing Fuel

A Fast CFD-Based Methodology for Determining the Cyclic Variability and Its Effects on Performance and Emissions of Spark-Ignition Engines

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