Numerical investigation of multiphase reactive processes using flamelet generated manifold approach and extended coherent flame combustion model

Jurić, Filip; Stipić, Marija; Samec, Niko; Hriberšek, Matjaž; Honus, Stanislav; Vujanović, Milan

doi:10.1016/j.enconman.2021.114261

Cited by 22 publications

(5 citation statements)

References 52 publications

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“…A partially premixed combustion model was thus adopted in this work. The flamelet generated manifold (FGM (Verma et al, 2019;Jurić et al, 2021)) model has previously been applied to treat turbulent chemical processes and has been widely used to treat combustion (Ramaekers, 2011;Verma et al, 2019).…”

Section: Turbulent Combustion Modelmentioning

confidence: 99%

Three-Dimensional Numerical Analysis of Longitudinal Thermoacoustic Instability in a Single-Element Rocket Combustor

Guo

Ren

et al. 2022

Front. Energy Res.

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This study numerically investigated the thermoacoustic combustion instability characteristics of a scaled rocket combustor based on a hybrid of the Reynolds-averaged Navier–Stokes and large–eddy simulation method. The turbulence–combustion interactions were treated using flamelet generated manifold approach. An unstable case was simulated with detailed reaction mechanisms (GRI-Mech 3.0). The obtained results agree well with experiment data from Purdue University, in terms of pressure oscillations frequency and power spectral density spectrum. The combustion instability mode was identified to be coupled with the first longitudinal acoustic mode of the combustion chamber by dynamic model decomposition method. According to Rayleigh index analysis, the unstable driving source was found to be located near the combustor step, which was further confirmed by time-averaged flow fields. Detailed three-dimensional vortex ring shedding evolutions at the combustor step were tracked with fine time resolution. Results indicate that the combustion instability arises from periodic vortex ring shedding at the combustor step and interacting with the chamber wall. The unburnt reactants were rolled up by the shedding vortex ring, which would not break up until impact with the chamber wall. Therefore, the mixing performance was significantly enhanced, leading to sudden heat release. Consequently, the thermal energy is added to the acoustic field, and the first longitudinal mode is thus reinforced, giving rise to large amplitude axial velocity oscillations which prompt the generation of the new vortex ring. The results of the present investigation will support the design and development of high-performance rocket engines.

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Section: Turbulent Combustion Modelmentioning

confidence: 99%

Three-Dimensional Numerical Analysis of Longitudinal Thermoacoustic Instability in a Single-Element Rocket Combustor

Guo

Ren

et al. 2022

Front. Energy Res.

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“…A coherent flame model, ECFM‐3Z combustion model, was employed for the modeling of the combustion process. The ECFM‐3Z combustion model governing equations can be found in Jurić et al, 41 where the ECFM‐3Z was also used for the modeling of combustion inside a combustion chamber of an industrial diesel engine. The constant autoignition and mixing parameters were assumed to have the default value of 1.…”

Section: Mathematical Modelmentioning

confidence: 99%

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

Jurić

Coelho

Priesching

et al. 2022

Intl J of Energy Research

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Summary It is well‐known that the pollutant formation processes and temperature distribution in various combustion systems that operate at high temperatures are influenced by radiation heat transport. Detailed modeling of radiation transport in internal combustion (IC) engines demands additional computational power, and hence the calculation of radiation phenomenon is not commonly applied in IC engines. At the same time, current operating conditions in IC engines consider high temperatures and recirculation of exhaust gases that enhance gas radiation. Therefore, the application of radiation models is needed to increase the correctness of radiative absorption, combustion characteristics, and the formation of pollutant emissions. In this paper, the implementation and validation of the spectral line‐based weighted‐sum‐of‐gray‐gases (SLW) model for calculating soot and gas radiation are performed. The SLW model is implemented in the computational fluid dynamics code AVL FIRE by programable user routines. The radiative transfer equation was calculated employing the finite volume method applicable for multiprocessing, moving meshes, and a mesh rezone procedure required for IC engine modeling. The validation of the SLW model is performed on one‐dimensional geometric cases that include analytical results of radiation intensity, for which agreement within 10% of the relative error was achieved. Additionally, the SLW model is applied to compression ignition engine simulations, where the obtained results are compared with the measured pressure and concentrations of NO and soot emissions. The calculated heat losses through the wall boundary layer were around 12% of the total fuel energy, approximately 9.5% of the total fuel energy was lost due to the convective flow. 7%–8% of convection heat loss was due to the higher emission than absorption of participating CO2 and H2O gasses, and the rest are net soot losses. For the observed operating cases, the computational time is increased nearly double for SLW model than in the simulation without radiation. Finally, the results calculated using SLW indicate an improved agreement with the experimental mean pressure, temperature, soot, and NO concentrations compared to simulations without radiation.

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“…It is validated for calculations of single injection and multi injection combustion regimes inside an ICE (Jurić et al 2019). ECFM-3Z is suitable for multiphase reactive flow description due to the fact it adequately predicts autoignition point and the rate of heat release (RoHR) in the initial phase of the combustion (Jurić et al 2021). Pretabulated autoignition is generated from the open-source chemistry solver Cantera for constant pressure non-dimensional reactors, while laminar flame speed databases are generated from the premixed freely propagating flames.…”

Section: Introductionmentioning

confidence: 99%

Numerical Assessment of Polyoxymethylene Dimethyl Ether (OME3) Injection Timing in Compression Ignition Engine

Markovic

Jurić

Šošić

et al. 2023

Preprint

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This research encompasses the numerical analysis of trioxymethylene dimethyl ether (OME-3) e-fuel on an industrial compression ignition engine, as a viable replacement for diesel fuel. The performed simulations examined single injection and multi injection operating conditions of OME-3, varying injection rates and timing. The combustion process is modelled employing two approaches: three-dimensional Extended Coherent Flame Model (ECFM-3Z) and General Gas Phase Reactions (GGPR) with the reduced chemical kinetic mechanism. ECFM-3Z gives a faster convergence, where pretabulated autoignition and laminar flame speed databases are integrated into the model to decrease computational time. GGPR approach is validated on the experimental values for mean pressure, temperature, and rate of released heat in the same engine with diesel fuel and then again on an OME-3. Both approaches confirmed that a higher amount of OME-3 and a longer injection time is needed to achieve equivalent output power as diesel fuel since OME-3 has a lower net calorific value. It is established that multi injection case with an adapted injection timing is the optimal choice for OME-3 combustion since it achieves a 15% higher mean pressure peak compared to the diesel case. Nitrogen oxides emissions for OME-3 are also compared to the diesel case for both combustion modelling approaches.

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Numerical investigation of multiphase reactive processes using flamelet generated manifold approach and extended coherent flame combustion model

Cited by 22 publications

References 52 publications

Three-Dimensional Numerical Analysis of Longitudinal Thermoacoustic Instability in a Single-Element Rocket Combustor

Three-Dimensional Numerical Analysis of Longitudinal Thermoacoustic Instability in a Single-Element Rocket Combustor

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

Numerical Assessment of Polyoxymethylene Dimethyl Ether (OME3) Injection Timing in Compression Ignition Engine

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