Predicting Ignition delay and HC emission for DI diesel engine encompassing EGR and Oxygenated fuels

Aghav, Yogesh V.; Thatte, V. M.; Kumar, M. N.; Lakshminarayanan, P. A.; Babu, M. K. Gajendra

doi:10.4271/2008-28-0050

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…Several more recent efforts are based on Arrhenius expressions. Aghav et al 17 applied the work of Lahiri to oxygenated biofuels, utilizing the F/O ratio dependence in the Arrhenius expression to characterize the ignition delay in four different engine architectures. Gray and Ryan 18 used the dependence on oxygen concentration in equation (2) to investigate the effects of exhaust gas recirculation (EGR) during diesel HCCI combustion.…”

Section: Introductionmentioning

confidence: 99%

Control-oriented premixed charge compression ignition combustion timing model for a diesel engine utilizing flexible intake valve modulation

Alstine

Kocher

Koeberlein

et al. 2012

International Journal of Engine Research

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This paper describes a simple, analytical, control-oriented model for prediction of combustion timing during premixed charge compression ignition combustion with early fuel injection. The model includes direct dependence on in-cylinder temperature, in-cylinder pressure, and the total in-cylinder O 2 mass fraction, including the contribution of recirculated exhaust gas, residual burned gas, and backflow during the valve overlap period. The model is extensively validated against experimental premixed charge compression ignition data from a multi-cylinder diesel engine utilizing high-pressure recirculated exhaust gas, variable geometry turbocharging, and flexible intake valve actuation, which allows control over the engine's effective compression ratio. The results show that across a wide range of input conditions, the model predicts the start of combustion within 62°crank angle of the experimental values for all but three of the 180 data points (98%+ accuracy), with a root mean square error of 0.86°crank angle. The experimental start of combustion ranges from as early as 219.3°crank angle to as late as +0.6°crank angle by heavily exercising the control actuators, specifically the commanded start of injection timing SOI ecm , the intake valve closure timing, and the engine's air-handling system (recirculated exhaust gas valve position and variable geometry turbocharger position). Analysis is performed to isolate the effects and control authority of each actuator on the ignition delay and start of combustion timing. During these actuator sweeps, the model captures complex relationships and predicts the start of combustion within 62°crank angle of the experimental values. This premixed charge compression ignition combustion timing model can be coupled with a gas exchange model for control algorithm design and analysis.

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Section: Introductionmentioning

confidence: 99%

Control-oriented premixed charge compression ignition combustion timing model for a diesel engine utilizing flexible intake valve modulation

Alstine

Kocher

Koeberlein

et al. 2012

International Journal of Engine Research

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“…The main reasons are lower oxygen content and a longer ignition delay. HC emissions occur as a result of low combustion rates 42 …”

Section: Resultsmentioning

confidence: 99%

The combined effect of split fueling strategy and EGR on the combustion, performance, and emission characteristics of a CRDI biofuel engine

Fernandes,

Rajashekhar,

Dinesha

2024

Heat Trans

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The current research investigates the impact of a split fueling strategy combined with several flow rates of exhaust gas recirculation (EGR) on the combustion and emission characteristics of a diesel engine running on B20 waste cooking oil (WCO) biodiesel. A four‐stroke single‐cylinder common rail direct injection engine was employed for experiments. It operates with a B20 blend of WCO biodiesel at 600 bar pressure for varying pilot fueling conditions of 10%, 20%, and 30%. The B20 blend with 30% pilot fuel injection (B20P30) showed excellent performance and emission characteristics compared with B20 blend with 10% pilot fuel injection (B20P10) and B20 with 20% pilot fuel injection (B20P20). However, B20P30 had greater levels of nitrogen oxide (NOx) emissions than those by diesel. EGR discharge levels in 5% increments, ranging from 0% to 15% were introduced to address this issue. The experimental findings revealed that both cylinder peak pressure and heat release rate showed a reduction when the EGR flow rate was enhanced. The recirculation of exhaust gas into the combustion chamber led to a slight increase in the emission levels of hydrocarbon (HC), carbon monoxide (CO), and smoke, as well as a decrease in carbon dioxide (CO2). Nevertheless, the introduction of EGR significantly decreased NOx emissions by 22.94%, 35.05%, and 47.96% for EGR flow rates of 5%, 10%, and 15%, respectively, when compared with the engine operating without EGR. Overall, the two‐stage fueling strategy, B20P30 blended with 10% EGR corroborated to be beneficial in reducing NOx emissions with minimal performance penalties. Although there was a slight uptick in certain emissions, the overall trade‐off between emission reduction and performance was favorable. The culmination of this study is targeting the objectives of sustainable development goal 7 (clean energy) and goal 13 (climate action) to be achieved by 2030.

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“…The above determined parameters with equilibrium hypothesis permit the determination of in-cylinder burning mixture pressure and temperature. The following three equations give relationships for the internal energy, specific volume, entropy, enthalpy, and specific heat with temperature and pressure as functions of the crank angle [24,25]:…”

Section: Ignition Delay and Heat Release Submodelsmentioning

confidence: 99%

Comparative Numerical Study of Four Biodiesel Surrogates for Application on Diesel 0D Phenomenological Modeling

Abbe

Raïdandi

Nzengwa

2016

Journal of Combustion

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To meet more stringent norms and standards concerning engine performances and emissions, engine manufacturers need to develop new technologies enhancing the nonpolluting properties of the fuels. In that sense, the testing and development of alternative fuels such as biodiesel are of great importance. Fuel testing is nowadays a matter of experimental and numerical work. Researches on diesel engine’s fuel involve the use of surrogates, for which the combustion mechanisms are well known and relatively similar to the investigated fuel. Biodiesel, due to its complex molecular configuration, is still the subject of numerous investigations in that area. This study presents the comparison of four biodiesel surrogates, methyl-butanoate, ethyl-butyrate, methyl-decanoate, and methyl-9-decenoate, in a 0D phenomenological combustion model. They were investigated for in-cylinder pressure, thermal efficiency, andNOxemissions. Experiments were performed on a six-cylinder turbocharged DI diesel engine fuelled by methyl ester (MEB) and ethyl ester (EEB) biodiesel from wasted frying oil. Results showed that, among the four surrogates, methyl butanoate presented better results for all the studied parameters. In-cylinder pressure and thermal efficiency were predicted with good accuracy by the four surrogates.NOxemissions were well predicted for methyl butanoate but for the other three gave approximation errors over 50%.

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Predicting Ignition delay and HC emission for DI diesel engine encompassing EGR and Oxygenated fuels

Cited by 8 publications

References 10 publications

Control-oriented premixed charge compression ignition combustion timing model for a diesel engine utilizing flexible intake valve modulation

Control-oriented premixed charge compression ignition combustion timing model for a diesel engine utilizing flexible intake valve modulation

The combined effect of split fueling strategy and EGR on the combustion, performance, and emission characteristics of a CRDI biofuel engine

Comparative Numerical Study of Four Biodiesel Surrogates for Application on Diesel 0D Phenomenological Modeling

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