The effects of hydrogen addition on engine power and emission in DME premixed charge compression ignition engine

Jeon, Jeeyeon; Bae, Choongsik

doi:10.1016/j.ijhydene.2012.09.177

Cited by 42 publications

(11 citation statements)

References 24 publications

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“…An early fuel injection event can result in a delayed start of combustion, owing to the lower in-cylinder temperature, and a higher peak heat release rate in PCCI. 135,136 The NO x emissions are lower in PCCI compared to conventional combustion owing to the reduction in near-stoichiometric fuel mixtures, which is well known as the major source for NO x formation. However, the IMEP, HC, PM and CO emissions are deteriorated compared to conventional combustion because of early fuel injection, advanced combustion phasing, spray wall wetting and lower combustion gas temperatures.…”

Section: Fuel Effects In Diesel Ltcmentioning

confidence: 99%

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Prospective fuels for diesel low temperature combustion engine applications: A critical review

Krishnasamy

Gupta

Reitz

2020

International Journal of Engine Research

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Low Temperature Combustion (LTC) strategies are most promising to simultaneously reduce oxides of nitrogen (NOx) and soot emissions from diesel engines along with offering higher thermal efficiency. Commercial wide spread implementation of diesel LTC strategies requires several challenges to be addressed, including lack of precise ignition timing control, widening the narrow operating load ranges and reducing high unburned fuel emissions. These challenges can be addressed through modifications in the engine or fuel design or both. The timing and rate of combustion in several LTC strategies are controlled primarily by the chemical kinetics of the fuel. Since, diesel fuel reactivity and volatility are tailor-made to perform well under conventional diesel combustion conditions, its application in LTC poses several problems, as highlighted in this paper. Hence, it is important to identify suitable alternative fuels for the different diesel LTC strategies. The published literature on LTC over the past 25 years is critically analyzed to discuss the evolution of the different diesel LTC strategies, their operability limits, the challenges and the controlling parameters for each strategy. This is followed by in-depth analysis of the role of the fuel and the fuel requirements for each strategy. Further, the importance of adopting a hybrid surrogate modeling approach to enable numerical simulation of diesel LTC is highlighted. A novel attempt of relating various diesel low temperature combustion (LTC) strategies based on the approach followed to achieve positive ignition dwell through different injection strategies, utilizing high exhaust gas recirculation (EGR), and dual fuels is presented. The need for replacing diesel with alternative liquid fuels in LTC strategies is presented by highlighting the fundamental problems associated with diesel fuel characteristics. The review concludes by suggesting potential alternative fuels for various diesel LTC strategies and provides directions for future work to address the challenges facing compression ignition LTC operation.

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Section: Fuel Effects In Diesel Ltcmentioning

confidence: 99%

“…Hydrogen addition also reduces the CO, CO 2 , and HC emissions but leads to an increment in NO x . 136 Consequently, utilizing pilot injection along with EGR in PCCI is found to be effective for increasing IMEP and reducing emissions. 135…”

Section: Fuel Effects In Diesel Ltcmentioning

confidence: 99%

Prospective fuels for diesel low temperature combustion engine applications: A critical review

Krishnasamy

Gupta

Reitz

2020

International Journal of Engine Research

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“…DME is often mixed with high octane number hydrocarbon fuels, such as natural gas, 17,18 hydrogen, 19 methanol, 20 methane, 21 ethane, 22 and n-butane, 23 to improve ignition and combustion performance. Likewise, combining DME and LPG is a promising method to control the engine combustion and emissions.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Kinetic Study on Ignition Delay Times of Liquified Petroleum Gas/Dimethyl Ether Blends in a Shock Tube

Ouyang

Geng

et al. 2014

Energy Fuels

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In this study, ignition delay times of liquified petroleum gas (LPG)/dimethyl ether (DME) (LPG consists of C 3 H 8 and C 4 H 10 in this work) were measured in a shock tube at different DME blending ratios (0%, 10%, 30%, and 50%), pressures (5, 10, and 15 atm), temperatures (1100−1500 K), and equivalence ratios (0.5, 1.0, and 1.5). The chemical kinetic mechanism of LPG/DME was established based on Lawrence Livermore National Laboratory's C1−C4 chemical kinetic mechanism (Combust. Flame 1998, 114, 192−213) and Zhao's DME chemical kinetic mechanism (Int. J. Chem. Kinet. 2008, 40, 1−18), and its predictions agree well with experimental data. A sensitivity analysis and a reaction pathway analysis were conducted using CHEMKIN-PRO to study the impact of DME addition on the ignition and combustion process. The experimental results show that the ignition delay times of LPG/DME change linearly with increasing DME blending ratios. The sensitivity analysis shows that the number of major promoting reactions for mixtures increases, including H-abstraction and decomposition of CH 3 OCH 3 , while the sensitivity factors of the H-abstraction and the decomposition of C 3 H 8 (reactions R115, R120, and R125) decrease with increasing DME blending ratios. The reaction pathway analysis indicates that the H-abstraction reactions play a dominant role, and the contribution rate of OH to H-abstraction increases, while that of H-radical decreases slightly in the oxidation of C 3 H 8 and C 4 H 10 with the increasing proportion of DME in the LPG/DME mixtures. Further analysis shows that although the growth rate of H before ignition is LPG100 > LPG50 > DME, reaction R22 in the oxidation process of mixtures makes OH accumulate rapidly in a short time, resulting in a much higher peak concentration of OH than that of H; therefore, the ignition delay times of mixtures are shorter than those of neat LPG.

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“…Hydrogen has a viable application for spark ignition engines due to high octane number, however, some studies have indicate that at compression ratios over 17 the H2 can be implemented in compression ignition engines [70,71]. Hydrogen has been used as an additive for combustion improvement, even the H2 has been implemented with an external ignition source (pilot injected high cetane fuel) in CI engines because it improves the combustion rate.…”

Section: Renewable Hydrogenmentioning

confidence: 99%

“…However, the indicated efficiency was about 90% of that obtained with diesel at moderate loads. At low load, the efficiency of the hydrogen-fueled engine decreases compared to that at moderate loads [70,71]. Another potential use of hydrogen is as a medium for the energy storage by means of fuel cells.…”

Section: Renewable Hydrogenmentioning

confidence: 99%

Experimental study of the fuel effect on diffusion combustion and soot formation under diesel engine-like conditions

Carrero¹

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CO2 emissions in the transport sector have increased considerably in recent years due to global economic development. The growth of transport fleets, along with other factors, has contributed to the imbalance of the planet's carbon cycle. For that, CO2 is considered a greenhouse gas from anthropogenic origin that must be reduced to avoid global warming.Strategies to reduce CO2 in the transport sector are focused on electrification and the use of neutral fuels or those with a low impact on the environment. However, an effective implementation of the latter requires a deep understanding of the combustion with those fuels. In this doctoral thesis, the combustion of different types of fuels has been experimentally characterized, including some with low impact on CO2 emissions such as Hydrotreated Vegetable Oil (HVO) and two oxymethylene ethers (OME1 and OMEx). Furthermore, due to their potential in reducing pollutants, blends of diesel and gasoline and HVO and Liquefied Petroleum Gas (LPG) have also been evaluated, which required adapting the injection system to avoid evaporation along the injection line.All these fuels and blends have been injected with a single-hole nozzle and they have been evaluated using high speed visualization techniques under different thermodynamic conditions typical of a compression ignition engine operating under low-temperature combustion conditions in installations with optical accesses.The effect of the physical-chemical properties of these fuels and blends on the characteristic parameters of a jet, such as the liquid length and the vapor penetration, has been analyzed. Combustion has been evaluated by characterizing the ignition delay, the heat release and the flame Lift-off length that is conditioned by the mixing process. Furthermore, the study of soot formation based on the fuel properties and the characteristics of the mixing process represents an important contribution of this thesis, showing that in addition to the benefits in CO2 reduction provided by the different fuels and blends used in this study, these fuels also reduced the soot formation in the combustion chamber, highlighting among them the oxygenated fuels, especially OMEx which, in addition to not forming soot, was the most reactive in all conditions of operation evaluated.

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The effects of hydrogen addition on engine power and emission in DME premixed charge compression ignition engine

Cited by 42 publications

References 24 publications

Prospective fuels for diesel low temperature combustion engine applications: A critical review

Prospective fuels for diesel low temperature combustion engine applications: A critical review

Experimental and Kinetic Study on Ignition Delay Times of Liquified Petroleum Gas/Dimethyl Ether Blends in a Shock Tube

Experimental study of the fuel effect on diffusion combustion and soot formation under diesel engine-like conditions

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