Measured and LES Motored-Flow Kinetic Energy Evolution in the TCC-III Engine

Reuss, David L.; Zhong, None Z. Z.; Yang, Xiaofeng; Kuo, Tang-Wei; Sick, Volker

doi:10.4271/2018-01-0192

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…5a. Reuss [27], employed a 2D-PIV to measure the characteristics of large-scale flow-structures at TDC in a motored, two-valve, four-stroke engine using highly directed flow by a shrouded valve and a relatively undirected flow using a standard valve. For the undirected flow, it was concluded that none of cycles had the appearance of the ensemble mean and the instantaneous velocity vectors had no specific pattern.…”

Section: Data Post-processingmentioning

confidence: 99%

Characterization of flame front wrinkling in a highly pressure-charged spark ignition engine

Zhang

Morsy

Ling

et al. 2022

Experimental Thermal and Fluid Science

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Particle Image Velocimetry (PIV) technique has been employed to investigate turbulent flame propagation in a relatively quiescent, optically accessed, boosted, two-stroke spark ignition engine.Turbulence scales and flame structure have been characterized based on Fourier analysis of an independent stationary coordinate at elevated pressures. Analysis shows that turbulence, with an initial rms value of 𝑢′, is modified by flames, and the strong induced velocity field ahead of it. As the flame grows, the persistence of larger scale structures as well as smaller scale wrinkling is apparent. Power spectral density (PSD) of flame wrinkling exhibit the same general trend under different operating conditions. These are in a good agreement with the previous data measured from other rigs (i.e. burners and bombs), which featured lower pressures. These functions have been normalized by terms of wrinkling parameters and other turbulence parameters. General PSD functions are developed. These can predict the flame wrinkling behavior at low and high pressures, in different experimental apparatuses.

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Section: Data Post-processingmentioning

confidence: 99%

Characterization of flame front wrinkling in a highly pressure-charged spark ignition engine

Zhang

Morsy

Ling

et al. 2022

Experimental Thermal and Fluid Science

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“…Optical engines were established with the goal to provide measurement data for an advanced evaluation of turbulence models [20,21]. These research activities provided a considerable database of flow and flame data during the last years that was used by the community to validate the CFD codes with respect to turbulent flow, mixture preparation and combustion [22,23]. A hybrid formulation of URANS, DES and LES was investigated in [24] and compared to PIV-like experimental data from the TCC-III engine and full-LES results.…”

Section: Basic Challenges Of Turbulent In-cylinder Flowmentioning

confidence: 99%

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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“…19,20 Schiffmann et al’s 21 pioneering work on the TCC engine, the same engine platform used in this study, focused on in-cylinder flow aerodynamics to analyze variations in tumble, swirl and instantaneous flow structures. Since then, many researchers have worked on the same data set, focusing on different aspects, such as the effect of subgrid models, 22 the effect of grid density, 23 the analysis of the pressure-driven intake jet and its dissipation, 24 the analysis of CCV 25 or the combustion modeling approach. 26 Deep literature reviews on the application of LES to ICEs can be found in works of Rutland 17 and Haworth.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation analysis of the turbulent flow in an optically accessible internal combustion engine using the overset mesh technique

Rulli

Barbato

Fontanesi

et al. 2020

International Journal of Engine Research

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Computational fluid dynamics has become a fundamental tool for the design and development of internal combustion engines. The meshing strategy plays a central role in the computational efficiency, in the management of the moving components of the engine and in the accuracy of results. The overset mesh approach, usually referred to also as chimera grid or composite grid, was rarely applied to the simulation of internal combustion engines, mainly because of the difficulty in adapting the technique to the specific complexities of internal combustion engine flows. The article demonstrates the feasibility and the effectiveness of the overset mesh technique application to internal combustion engines, thanks to a purposely designed meshing approach. In particular, the technique is used to analyze the cycle-to-cycle variability of internal combustion engine flows using large eddy simulation. Fifty large eddy simulation cycles are performed on the well-known TCC-III engine in motored condition. Results are analyzed in terms of tumble center trajectory and using proper orthogonal decomposition to objectively characterize the spatial and temporal evolution of turbulent flow field in internal combustion engines. In particular, an original decomposition method previously applied by the authors to the TCC-III measured flow fields is here extended to computational fluid dynamics results.

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Measured and LES Motored-Flow Kinetic Energy Evolution in the TCC-III Engine

Cited by 5 publications

References 13 publications

Characterization of flame front wrinkling in a highly pressure-charged spark ignition engine

Characterization of flame front wrinkling in a highly pressure-charged spark ignition engine

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

Large eddy simulation analysis of the turbulent flow in an optically accessible internal combustion engine using the overset mesh technique

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