Simulation studies of combustion in spark ignition engine using OpenFOAM

In the current paper, a CFD simulation study on a pent-roof, spark ignition engine was performed. The scope was to analyze the basic parameters that influence the performances of the simulation: mesh configuration, mesh refinement, turbulence model, and flame wrinkling model parameters. It was used as the OpenFOAM solver for spark ignition engines. The solver was modified by adding the layer addition/removal mechanism for the mesh. Further, a Zeldovich extended NOx model was implemented. Four different mesh configurations were tested with different refinement levels. A set of different turbulence models and initial parameters and different flame wrinkling model parameters were tested. It was observed how all these parameters influence the rate of heat release, cylinder pressure, temperature, the level of turbulent kinetic energy, the flame wrinkling factor, and finally the resulting concentration of nitride monoxide.

Section: Turbulence Modelingmentioning

confidence: 99%

Section: Mesh Configurationmentioning

confidence: 99%

Section: Figure 17 Turbulence Model Influence On Flame Wrinkling Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of mesh and combustion parameters on a spark ignition engine CFD simulation

Senčić,

Mrzljak,

Bukovac

et al. 2023

“…In the present study, our major focus was on flame propagation and its effects on engine performance. Further details of continuity, momentum, turbulent kinetic energy and dissipation, internal energy, energy of state and chemical reaction can be found in [16,17] as well as in the appendix section.…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical investigation on effect of spark plug configuration on performance in an engine cylinder

Bakhshi,

Pritanshu,

Shukla

2023

A numerical investigation of combustion inside single and twin-spark engines was performed to study the effect of a spark plug, positions and spark timings on engine performance. Improvement in engine performance is one of the automotive industry's primary research areas. Consequently, the study's results can be utilised to optimise engine configurations to achieve maximum performance. The investigation was conducted using a finite volume-based open-source software, OpenFOAM, for computational simulations. Simulations were conducted using the XiEngineFOAM solver with a transport equation for modelling flame fronts. The Standard k-e turbulence model was used to predict turbulence parameters. The simulation was conducted for compression and power stroke (crank angle between - 180° and 180°), assuming an even distribution of the air-fuel mixture within the pentroof 4-valve engine cylinder. Simulations were conducted for four cases, including variations in the position and timing of spark plugs in single-spark and twin-spark engines. According to the results of the simulations, the single-spark engine provides the best performance when the spark plug is ignited early and positioned at the cylinder's centre. When placed at an optimal position determined by flame travel and collision, the twin-spark engine gives the best performance at the highest difference between the spark timings of the two spark plugs.

Effect of propane-methanol blending ratio on the stretched and unstretched flame speeds at elevated initial temperatures

Abdulraheem¹,

Saleh²,

Shahad³

2022

The unstretched flame speed of the premixed propane-methanol/ air flames has been studied experimentally in a constant volume combustion chamber with central ignition. The experiments were done at atmospheric pressure and stoichiometric air/fuel ratio. Various blending ratios of methanol (0%, 20%, 40%, 60%, 80%, 100%) by volume, and different elevated initial temperatures (348 K, 373 K, and 398 K) were used in this study. In general, the results indicated that the unstretched flame speed increased with increasing both methanol blending ratio and initial temperature. For M60 the increment value of unstretched flame speed at Ti=398K was about 9% compared with that of pure propane and by elevating the initial temperature for the same blend ratio (M60) from 348 K to 398 K the increment value was about 8.8%. It is also noticed that Markstein length decreased with increasing both initial temperature and blending ratio, which is indicate that flame instability increased with increasing these parameters.