Numerical modelling of unburned hydrocarbon emissions in gas engines with varied fuels

Kuppa, Kalyan; Nguyễn, Hoàng Dũng; Goldmann, Andreas; Korb, B.; Wachtmeister, Georg; Dinkelacker, Friedrich

doi:10.1016/j.fuel.2019.05.115

Cited by 18 publications

(7 citation statements)

References 13 publications

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“…A recent demonstration of the present capabilities was given by Kuppa et al, who presented results of a URANS simulation including a flame quenching model based on the Péclet-number, a crevice and post oxidation model and found a good qualitative agreement with measurements from a 1-cylinder research engine [102].…”

Section: Hydrocarbonsmentioning

confidence: 65%

Section: Flame Propagationmentioning

confidence: 99%

“…For premixed lean burn gas engines, the combustion models strongly rely on laminar and turbulent flame speed [102]. Though research has been done during the last years to provide data on the high-temperature chemistry and the interaction with turbulence [102,103], an extension of this database to high pressures beyond 10 MPa as well as very lean mixtures and low laminar flame speeds is still needed [104]. Simulations of an un-scavenged prechamber with the G-equation model revealed that the turbulence/flame-interaction differed significantly from the conditions in the main chamber and an extended formulation of the turbulent flame speed was necessary [105].…”

Section: Flame Propagationmentioning

confidence: 99%

See 2 more Smart Citations

Towards a Predictive Simulation of Turbulent Combustion?—An Assessment for Large Internal Combustion Engines

Lauer

Frühhaber

2020

Energies

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Frequently the question arises in what sense numerical simulation can be considered predictive if prior model tuning with test results is necessary. In this paper a summary of the present Computational Fluid Dynamics (CFD) simulation methods for in-cylinder modelling is presented with a focus on combustion processes relevant for large engines. The current discussion about the sustainability of internal combustion engines will have a strong impact on applying advanced CFD methods in industrial processes. It is therefore included in the assessment. Simplifications and assumptions of turbulence, spray, and combustion models, as well as uncertainties of model boundary conditions, are discussed and the future potential of an advanced approach like Large Eddy Simulation (LES) is evaluated. It follows that a high amount of expertise and a careful evaluation of the numerical results will remain necessary in the future to apply the best-suited models for a given combustion process. New chemical mechanisms will have to be developed in order to represent prospective fuels like hydrogen or OME. Multi-injection or dual fuel combustion will further pose high requirements to the numerical methods. Therefore, the further development and validation of advanced mixture, combustion and emission models will remain important. Close cooperation between academia, code suppliers and engine manufacturers could promote the necessary progress.

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Section: Hydrocarbonsmentioning

confidence: 65%

Section: Flame Propagationmentioning

confidence: 99%

Section: Flame Propagationmentioning

confidence: 99%

See 1 more Smart Citation

Towards a Predictive Simulation of Turbulent Combustion?—An Assessment for Large Internal Combustion Engines

Lauer

Frühhaber

2020

Energies

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“…The significant source of unburned hydrocarbon emissions is the crevice volume between the liner, piston, and top piston ring. Crevice volume can be calculated based on Equation ) 86,87

V_{cr} = \frac{π}{4} ((), D_{bore}^{2} - D_{piston}^{2}) \times S_{cr}

…”

Section: Methodsmentioning

confidence: 99%

Energy and environmental enhancement of power generation units by means of zero‐flow coolant strategy

et al. 2021

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Summary Warm‐up period is considered as the most critical phase in the operation of any device that converts the energy of a fuel into heat, electricity, and other products, including power generation units since the system efficiency and environmental pollution levels are much worse than the normal operation in that phase. Considering this point, in this study, applying the zero‐flow coolant strategy to reduce the warm‐up period is suggested for power generation units and it is investigated in details. An internal combustion engine is selected as the case‐study and implementation of the method to enhance the performance of that from both energy and environmental aspects are studied comprehensively. As the results show, for the investigated engine, which has a capacity of 1.8 L, implementation of the method leads to 17% decrease in the warm‐up period. It is accompanied by 9.32% and 2.23% improvement in the amount of unburned hydrocarbon emission and fuel consumption. Moreover, based on the conducted discussion, despite other available methods to enhance systems that consume fuel, the method is so practical that it could be employed simply in an energy system without imposing a huge cost, which is taken into account as a significant advantage.

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“…[15]. To predict unburned hydrocarbons, which is especially important in dual fuel engines due to the methane slip, Kuppa [48] has developed a numerical model.…”

Section: Challenges Of Dual Fuel Combustion Modelingmentioning

confidence: 99%

Development and Validation of 3D-CFD Injection and Combustion Models for Dual Fuel Combustion in Diesel Ignited Large Gas Engines

Eder¹,

Ban

Pirker³

et al. 2018

Energies

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This paper focuses on improving the 3D-Computational Fluid Dynamics (CFD) modeling of diesel ignited gas engines, with an emphasis on injection and combustion modeling. The challenges of modeling are stated and possible solutions are provided. A specific approach for modeling injection is proposed that improves the modeling of the ballistic region of the needle lift. Experimental results from an inert spray chamber are used for model validation. Two-stage ignition methods are described along with improvements in ignition delay modeling of the diesel ignited gas engine. The improved models are used in the Extended Coherent Flame Model with the 3 Zones approach (ECFM-3Z). The predictive capability of the models is investigated using data from single cylinder engine (SCE) tests conducted at the Large Engines Competence Center (LEC). The results are discussed and further steps for development are identified.

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Numerical modelling of unburned hydrocarbon emissions in gas engines with varied fuels

Cited by 18 publications

References 13 publications

Towards a Predictive Simulation of Turbulent Combustion?—An Assessment for Large Internal Combustion Engines

Towards a Predictive Simulation of Turbulent Combustion?—An Assessment for Large Internal Combustion Engines

Energy and environmental enhancement of power generation units by means of zero‐flow coolant strategy

Development and Validation of 3D-CFD Injection and Combustion Models for Dual Fuel Combustion in Diesel Ignited Large Gas Engines

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