Multidimensional Modeling of Injection and Combustion Phenomena in a Diesel Ignited Gas Engine

Eder, Lucas; Kiesling, Constantin; Priesching, Peter; Pirker, Gerhard; Wimmer, Andreas

doi:10.4271/2017-01-0559

Cited by 8 publications

(12 citation statements)

References 25 publications

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Section: Combustion Modelmentioning

confidence: 99%

“…At first, natural gas was represented by a mixture of methane and propane with a methane number of 80 to provide similar conditions to the natural gas used at the engine test rig. Second, diesel was represented by n-heptane due to its similar cetane number, which is a common approach in the modeling of DF combustion [19,20,39]. Based on the tabulated ignition delays, the parameters of the Arrhenius function were optimized using MATLAB ® (R2019b, The MathWorks Inc., Natick, MA, USA) to fit the ignition delay predicted by the function to the tabulated values.…”

Section: Combustion Modelmentioning

confidence: 99%

“…Another evident approach regarding flame propagation in premixed lean mixtures is applying a combustion model such as the Extended Coherent Flame Model (ECFM). Eder et al [20] adapted an ECFM model specifically for dual fuel combustion by adding tabulated ignition delays and laminar flame speeds depending on the mixture fraction of the two fuels. Decan et al [21] also presented a model of this type in terms of dual fuel combustion.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of the Turbulent Flame Propagation in Dual Fuel Engines by Means of Large Eddy Simulation

Frühhaber

Lauer

2021

Energies

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Dual fuel combustion depicts a possible alternative to reduce emissions from large engines and is characterized by injecting a small amount of diesel fuel into a lean natural gas–air mixture. Thereby, the presence of autoignition, diffusive and premixed combustion determine the high complexity of this process. In this work, an Extended Coherent Flame Model was adapted to consider the effect of natural gas on the ignition delay time. This model was afterward utilized to simulate 25 consecutive engine cycles employing LES. In this framework, the ensemble-average flow field was compared to a RANS solution to assess the advantages of LES in terms of the prediction of the in-cylinder flow field. A detailed investigation of the heat release characteristic showed that natural gas already highly contributes to the heat release at the beginning of combustion. Furthermore, a methodology to investigate the turbulent combustion regimes was utilized. It could be ascertained that the combustion mainly occurs in the regime of thin reaction zones. Possible triggers of cycle-to-cycle variations were determined in the velocity fluctuations in the cylinder axis direction and the flame formation in the gaps between the spray plume. The findings support the understanding of dual fuel combustion and serve as a basis for developing future combustion models.

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Section: Combustion Modelmentioning

confidence: 99%

Section: Combustion Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Investigation of the Turbulent Flame Propagation in Dual Fuel Engines by Means of Large Eddy Simulation

Frühhaber

Lauer

2021

Energies

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“…Measured rates of injection (ROI) provided the input for the spray model. The spray submodel parameters were calibrated from optical measurements of injection sprays into inert atmospheres; for further information on the calibration, see [64]. The turbulence model was a k-ζ-f model [65].…”

Section: Numerical Setupmentioning

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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“…Various studies have reported the effects of different fuel injection timings on engine performance and combustion characteristics. Eder et al investigated the influence of fuel injection timing on the ignition and combustion characteristics of dual-fuel engines with a large bore [9]. Kim et al reported on the combustion and emission characteristics by varying the fuel-spray angle and fuel injection timing conditions in a high-speed diesel engine [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Performance by Excessive Advanced Fuel Injection Timing on Marine Diesel Engine

Baek

Jung²,

Vuong

et al. 2023

Applied Sciences

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The injection timing of fuel in a diesel engine affects the combustion condition. Advanced fuel injection prolongs the ignition delay, positively impacting the increase in maximum combustion pressure and improving output. However, excessively advanced fuel injection can cause knocking. Moreover, premature ignition results in increased compression work when the maximum combustion pressure occurs before top dead center (TDC). This study aimed to diagnose and rectify starting failures, noise, and vibrations in a commercially operated ship engine by measuring the combustion pressure during low load operation. The target engine was a 4-stroke diesel, and the fuel injection system was mechanically controlled by a camshaft. The measured engine exhibited a 4.5 °CA error between the TDC, determined by the flywheel mark and the actual TDC. This discrepancy was influenced by excessively advanced fuel injection timing. It was confirmed that fuel injection and ignition were excessively advanced in all cylinders. After readjusting the engine by delaying the fuel injection timing by approximately 10 °CA, the combustion pressure was remeasured. The ignition was delayed by approximately 6.5 °CA at the same load, and the ignition intervals were uniformly adjusted. As the ignition timing was retarded, the compression work decreased and the expansion work increased in each cylinder, resulting in improved output across all cylinders. The amplitude of crankshaft angular velocity variation significantly decreased, improving uneven rotational force.

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Multidimensional Modeling of Injection and Combustion Phenomena in a Diesel Ignited Gas Engine

Cited by 8 publications

References 25 publications

Numerical Investigation of the Turbulent Flame Propagation in Dual Fuel Engines by Means of Large Eddy Simulation

Numerical Investigation of the Turbulent Flame Propagation in Dual Fuel Engines by Means of Large Eddy Simulation

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

Effect of Performance by Excessive Advanced Fuel Injection Timing on Marine Diesel Engine

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