Further study on wall film effects and flame quenching under engine thermodynamic conditions

Tao, Mingyuan; Zhao, Peng; VanDerWege, Brad; Iyer, Claudia O.; Ge, Haiwen

doi:10.1016/j.combustflame.2020.02.022

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…The authors also tried to analyze the mechanism(s) leading to suppressed chemical reactions and heat loss during the quenching occurrence. Tao et al (Tao et al, 2018;Tao et al, 2020) used a numerical simulation to investigate the effect of film on premixed flame propagation and emissions using iso-octane as the gasoline surrogate fuel.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Modeling Study of Wall Film Effect on Combustion Characteristics of Premixed Flame in a Constant Volume Combustion Bomb

et al. 2022

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The primary objective of the present study was to investigate the impact of wall film on the combustion characteristics of premixed flames in internal combustion engines through the joint experimental and numerical techniques. The interaction between the premixed methane-air flame and n-dodecane film attached to the wall of a constant volume combustion bomb was experimentally examined. The flame propagation processes, as well as pressure evolution were quantitatively characterized. Then, computational fluid dynamic (CFD) simulation was performed incorporating the combustion chemistry model. To enable efficient simulation of the chemically reacting flow in engine chambers, a simplified modeling approach based on a two-step reaction scheme was developed. A compact reaction model for the selected model fuel n-dodecane was constructed and reduced to include 35 chemical species and 180 reactions. The flame propagation process of the premixed flame and its interaction with dry and wet walls was studied. The results showed that the propagation of the premixed flame could be divided into four stages, and the existence of the slit structure increased the instability of the flame structure in the near-wall region. The wall film tended to promote emissions, producing more unburned hydrocarbons, soot precursors and aldehydes.

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Section: Introductionmentioning

confidence: 99%

Experimental and Modeling Study of Wall Film Effect on Combustion Characteristics of Premixed Flame in a Constant Volume Combustion Bomb

et al. 2022

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“…In order to investigate heat transfer and fluid-structures interactions in combustion engines, there is a strong demand for highly time-resolved heat flux measurements at the surface. Current phenomena that demand local, time resolved heat transfer measurements are for example, the formation of pollution and soot due to flame quenching in wall-near regions, [1][2][3][4] the run up 5 and piston damage mechanisms 6 of internal combustion engines and heat transfer augmentation of engine parts due to higher effective mean pressures and the utilization of fuels like hydrogen. 7 Typically, wall-mounted coaxial or thin film thermocouples [8][9][10][11][12][13][14][15] are used for surface temperature determination and are converted into heat flux data via numerical procedures like the Cook-Feldermann Algorithm 16 or via the surface temperature method proposed by Eichelberg.…”

Section: Introductionmentioning

confidence: 99%

Highly time-resolved heat flux measurement in a combustion engine

Huber

Gackstatter

Rödiger

et al. 2022

International Journal of Engine Research

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In this study a fast-response Atomic Layer Thermopile (ALTP) based heat flux measurement system is used for wall heat-flux determination in the combustion chamber of a commercially available SI-gasoline combustion engine. The ALTP system provides further process variables that supplement conventional cylinder pressure data with data that are highly resolved in time and location. The newly developed sensor modules were precisely calibrated and compared with other measurement techniques with radiation- and convection-based procedures. Quantitative highly time-resolved measurements with frequency resolutions up to 1 MHz are performed in the engine from low to full load and up to full speeds. Single-cycle and cycle-to-cycle measurements display the quality and high temporal resolution of the measurement system. The comparison of pressure and the heat-flux measurements shows the benefits of ALTPs for detection of engine, combustion and flow characteristics. The time progression of the heat flux curves and their autocorrelated signals show only minor noise interference. The measured results display significantly higher local peak heat flux densities with values up to 1250 Wcm−2 for certain measurement points and engine conditions than reported previously in literature for SI engines. A regression analysis suggests that the high peak heat flux densities obtained are caused by the significant higher engine power-levels per cylinder. The measured data compare well with regressions extrapolated from reported literature data. A provided uncertainty analysis revealed significant influencing parameters. The variation of thermal wall parameters with 20%–30% uncertainty are playing an essential role in particular.

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“…In addition, quenching of laminar and turbulent flames in various other configurations have been studies in. 10–18…”

Section: Introductionmentioning

confidence: 99%

Modelling combustion in spark ignition engines with special emphasis on near wall flame quenching

Ranasinghe

Malalasekera

2020

International Journal of Engine Research

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A flame front is quenched when approaching a cold wall due to excessive heat loss. Accurate computation of combustion rate in such situations requires accounting for near wall flame quenching. Combustion models, developed without considering wall effects, cannot be used for wall bounded combustion modelling, as it leads to wall flame acceleration problem. In this work, a new model was developed to estimate the near wall combustion rate, accommodating quenching effects. The developed correlation was then applied to predict the combustion in two spark ignition engines in combination with the famous Bray–Moss–Libby (BML) combustion model. BML model normally fails when applied to wall bounded combustion due to flame wall acceleration. Results show that the proposed quenching correlation has significantly improved the performance of BML model in wall bounded combustion. As a second step, in order to further enhance the performance, the BML model was modified with the use of Kolmogorov–Petrovski–Piskunov analysis and fractal theory. In which, a new dynamic formulation is proposed to evaluate the mean flame wrinkling scale, there by accounting for spatial inhomogeneity of turbulence. Results indicate that the combination of the quenching correlation and the modified BML model has been successful in eliminating wall flame acceleration problem, while accurately predicting in-cylinder pressure rise, mass burn rates and heat release rates.

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Further study on wall film effects and flame quenching under engine thermodynamic conditions

Cited by 11 publications

References 22 publications

Experimental and Modeling Study of Wall Film Effect on Combustion Characteristics of Premixed Flame in a Constant Volume Combustion Bomb

Experimental and Modeling Study of Wall Film Effect on Combustion Characteristics of Premixed Flame in a Constant Volume Combustion Bomb

Highly time-resolved heat flux measurement in a combustion engine

Modelling combustion in spark ignition engines with special emphasis on near wall flame quenching

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