Effect of the engine calibration parameters on gasoline partially premixed combustion performance and emissions compared to conventional diesel combustion in a light-duty Euro 6 engine

Dimitrakopoulos, Nikolaos; Blasio, Gabriele Di; Tunestål, Per; Tunér, Martin

doi:10.1016/j.apenergy.2018.07.098

Cited by 57 publications

(29 citation statements)

References 29 publications

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“…These combustion strategies, termed low temperature combustions (LTC), are usually characterized by high ignition delays (which guarantee a more homogeneous air-fuel mixing) and by the lean combustion of a mixture of air and gasoline-like fuels [3][4][5]. These combustion methodologies proved to be effective to simultaneously reduce engine-out emissions and improve efficiency [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Injection Pattern Investigation for Gasoline Partially Premixed Combustion Analysis

Stola¹,

Ravaglioli

Silvagni

et al. 2019

SAE Technical Paper Series

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Nowadays, compression-ignited engines are considered the most efficient and reliable technology for automotive applications. However, mainly due to the current emission regulations, that require increasingly stringent reductions of NOx and particulate matter, the use of diesel-like fuels is becoming a critical issue. For this reason, a large amount of research and experimentation is being carried out to investigate innovative combustion techniques suitable to simultaneously mitigate the production of NOx and soot, while improving engine efficiency. In this scenario, the combined use of compression-ignited engines and gasoline-like fuels proved to be very promising, especially in case the fuel is directly-injected in the combustion chamber at high pressure. The presented study analyzes the combustion process produced by the direct injection of small amounts of gasoline in a compression-ignited light-duty engine. The engine under investigation has been modified to guarantee a stable engine operation over its whole operating range, that is achieved controlling boost pressure and temperature, together with the design of the injection pattern. Experimental tests have been performed to highlight the impact of several control variables on the combustion effectiveness, i.e. on combustion efficiency and ignition delay. To identify the main mechanisms which impact the start of the combustion process and the sensitivity to the variation of the main control parameters, several tests have been run, directly-injecting constant amounts of gasoline in a compression ignited engine. These tests have been performed changing intake pressure and temperature (when suitable to maintain combustion stability), fuel pressure and injection timing within the cycle.

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Section: Introductionmentioning

confidence: 99%

Injection Pattern Investigation for Gasoline Partially Premixed Combustion Analysis

Stola¹,

Ravaglioli

Silvagni

et al. 2019

SAE Technical Paper Series

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show abstract

“…However these investigations are concluded that by using one of these methods resulting the reduction of some emission components or improvement of performance in the back which increasing the some other emission components [4]. For example, by using biofuels as an alternative to diesel engines to reduce CO, HC and smoke emissions, they pay the price to increase NOx emissions [5].Belgiorno et al [6,7] investigated the CI engine using two oxygenated fuel blends and reduced the CO emissions and soot emissions simultaneously. Beatrice et al [8] identified optimised engine boundary conditions such as boost pressure, injection pressure, nozzle flow number, peak fire pressure and inlet turbine temperature to achieve a power density of 100 kW/l in light duty diesel engines.…”

Section: Introductionmentioning

confidence: 99%

“…Beatrice et al [8] identified optimised engine boundary conditions such as boost pressure, injection pressure, nozzle flow number, peak fire pressure and inlet turbine temperature to achieve a power density of 100 kW/l in light duty diesel engines. Belgiorno et al [6,7] optimized the efficiency-NOx trade off in conventional and partially premixed combustion modes by finding the engine calibration parameters. Belgiorno et al [9] improved the fuel/air mixing in the combustion chamber by making additive manufacturing enabled innovative piston bowl in order to achieve better performance and emission characteristics.…”

Section: Introductionmentioning

confidence: 99%

Optimization of critical angle, distance and flow rate of secondary fuel injection in DI diesel engine using computational fluid dynamics

Sonachalam

Manieniyan

2021

SN Appl. Sci.

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This study presents the optimization of the intake manifold and the optimized flow rate of the acetylene gas which acts as a low reactivity fuel to achieve the superior performance and emission characteristics used in the Reactivity controlled compression ignition (RCCI) engine. Intake manifold is one of the engine components which are an important factor in determining the quality of combustion. A very recent evolution of the RCCI engine using the low temperature combustion technique requires a low reactivity fuel which is injected through the secondary fuel injector. The secondary fuel injector must be designed and optimized to allow the acetylene gas to maximize the engine performance and the amount of acetylene gas in liters per minute required for better combustion. If the secondary fuel injector is mounted apart from the critical point, then the performance of the RCCI engine may be poor and also if the acetylene gas is not supplied properly, there is a risk of poor combustion and also if the acetylene gas is supplied excessively, there is a risk of knocking along with the backfire due to the excess fuel charge accumulation during the combustion process. Physical testing of the secondary fuel injector in the intake manifold with different angles, distance and flow rate of supply of acetylene gas is time and cost consuming process. To mitigate this issue optimization is done through computational fluid dynamics principles comes in handy to minimize time and money. In our study, ANSYS-FLUENT software is used for simulation purposes. Optimization of acetylene gas injector distance is carried out by analyzing the pressure contours at the entrance of the combustion chamber. The optimized flow rate of acetylene gas and the injector inclination is found by analyzing the flow contours of turbulent kinetic energy and turbulent dissipation rate.

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“…Modern engines offer various strategies to reduce pollutants and CO 2 emissions such as exhaust gas recirculation or double and ducted fuel injection [19,20]. However, there are several applications where these kinds of approaches are not always possible, such as in the case of water pumps for irrigation, combined heat and power (CHP) systems based on old engine architectures, and portable and emergency generators.…”

Section: Introductionmentioning

confidence: 99%

Specific and Cumulative Exhaust Gas Emissions in Micro-Scale Generators Fueled by Syngas from Biomass Gasification

et al. 2021

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Climate change, environmental degradation, and biodiversity loss are prompting production systems to shift from a fossil-based economy to a circular bio-based one. In this context, biomass gasification is a promising alternative to fossil fuels that can contribute to power generation in rural communities and remote areas as well as provide a sustainable source of energy for developed countries. In this work, exhaust gas emissions (CO, NOx, and SO2) of two syngas-fueled micro-scale generators were measured. The first system is a commercial biomass gasifier genset, whereas the second is composed of a laboratory-scale gasifier prototype and a portable petrol generator. For this second facility, emissions were measured both running on gasoline and on syngas. The comparison was performed both on the pollutant concentration and on their cumulative amount. This comparison was made possible by calculating the exhaust gas flow by knowing the combustion stoichiometry and fuel consumption. The results showed a much lower pollutant concentration running on syngas compared to gasoline. In particular, considering the best configurations, every cubic meter of exhaust gas released running on syngas contains about 20 times less CO and almost one-third less NOx compared to gasoline. Moreover, the cumulative amount of emissions released was also considerably lower due to the lower exhaust gas flow (about 25%) released running on syngas.

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Effect of the engine calibration parameters on gasoline partially premixed combustion performance and emissions compared to conventional diesel combustion in a light-duty Euro 6 engine

Cited by 57 publications

References 29 publications

Injection Pattern Investigation for Gasoline Partially Premixed Combustion Analysis

Injection Pattern Investigation for Gasoline Partially Premixed Combustion Analysis

Optimization of critical angle, distance and flow rate of secondary fuel injection in DI diesel engine using computational fluid dynamics

Specific and Cumulative Exhaust Gas Emissions in Micro-Scale Generators Fueled by Syngas from Biomass Gasification

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