Numerical study and correlation development on laminar burning velocities of n-butanol, iso-octane and their blends: Focusing on diluent and blend ratio effects

Fu, Jianqin; Deng, Banglin; Wang, Yi; Yang, Jing; Zhang, Daming; Xu, Zhengxin; Liu, Jingping

doi:10.1016/j.fuel.2014.01.092

Cited by 31 publications

(13 citation statements)

References 48 publications

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“…The article introduces a new method to determine correction factors for exhaust gas recirculation (EGR) from engine pressure trace data by using a reverse thermodynamic model. Using this approach, a new correlation for the effects of exhaust gas diluent on the laminar burning velocity of a EURO VI specification gasoline is derived and compared against existing models by Metghalchi and Keck [10], Rhodes and Keck [11], Fu et al [12] and Bhattacharya et al [14]. It is found that existing models tend to overestimate the impact of EGR on laminar burning velocity, probably because their derivation did not consider all chemical species contained in exhaust gas.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

A Comparison of EGR Correction Factor Models Based on SI Engine Data

Smith¹,

Ruprecht²,

Roberts³

et al. 2019

SAE Int. J. Engines

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The article compares the accuracy of different exhaust gas recirculation (EGR) correction factor models under engine conditions. The effect of EGR on the laminar burning velocity of a EURO VI E10 specification gasoline (10% Ethanol content by volume) has been back calculated from engine pressure trace data, using the Leeds University Spark Ignition Engine Data Analysis (LUSIEDA) reverse thermodynamic code. The engine pressure data ranges from 5% to 25% EGR (by mass) with the running conditions, such as spark advance and pressure at intake valve closure, changed to maintain a constant engine load of 0.79 MPa gross mean effective pressure (GMEP). Based on the experimental data, a correlation is suggested on how the laminar burning velocity reduces with increasing EGR mass fraction. This correlation, together with existing models, was then implemented into the quasi-dimensional Leeds University Spark Ignition Engine (LUSIE) predictive engine code and resulting predictions are compared against measurements. It was found that the new correlation is in good agreement with experimental data for a diluent range of 5%-25%, providing the best fit for both engine loads investigated, whereas existing models tend to overpredict the reduction of burning velocity due to EGR.

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Section: Discussionmentioning

confidence: 99%

“…A correlation purely based on simulations was determined by Fu et al [12] using the CHEMKIN-PRO software and the Frassoldati et al model [13], which contains 249 species and 7966 reactions. The laminar burning velocity simulations were carried out at pressures and temperatures of up to 0.5 MPa and 500 K, respectively, for a stoichiometric mixture.…”

mentioning

confidence: 99%

A Comparison of EGR Correction Factor Models Based on SI Engine Data

Smith¹,

Ruprecht²,

Roberts³

et al. 2019

SAE Int. J. Engines

View full text Add to dashboard Cite

show abstract

“…The residual gas fraction was not included in the calculation of laminar burning velocities due to lack of purposely derived correlations on the effect of residuals for all these fuels at the same conditions of temperature and pressure. However, the residual gas fraction was estimated at about 8% at the conditions of study and this is expected to decrease the laminar burning velocities by about 30% according the work of [41] on iso-octane and ethanol fuels and of [72] on iso-octane and n-butanol blends. The reader is also guided to [53] where dilution effects have been discussed by in-cylinder flame tomography imaging and reference to the Peters-Borghi diagram in an engine of similar geometric characteristics to that of the current study, as well as to [51] for a similar discussion on both diagrams through chemiluminescence analysis of data from a another engine of analogous geometry.…”

Section: Flame Speed and Roundnessmentioning

confidence: 91%

Flame front analysis of ethanol, butanol, iso-octane and gasoline in a spark-ignition engine using laser tomography and integral length scale measurements

Aleiferis

Behringer

2015

Combustion and Flame

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“…It has been discussed that the grid size dependence between the criteria of 0.05 and 0.1 shows less than a 1% difference in laminar burning velocity. 35…”

Section: Modeling Methodologymentioning

confidence: 99%

Modeling laminar burning velocity of gasoline using an energy fraction-based mixing rule approach

Kim

Min

2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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To determine an optimum combustion chamber design and engine operating strategies, computational fluid dynamics simulations of direct-injection spark-ignition engines have become an indispensable step in the powertrain development process. The laminar burning velocity of gasoline is known as an essential input parameter for combustion simulations. In this study, a new methodology for modeling the laminar burning velocity of gasoline for direct-injection spark-ignition engine simulations is proposed. Considering the gasoline as a complex mixture of hydrocarbon fuel, three hydrocarbons, iso-octane, n-heptane, and toluene were incorporated as surrogate fuel components to represent gasoline with distinct aromatic laminar flame characteristics compared to alkane. A mixing rule, based on energy fractions, was adopted to consider the compositional variation of gasoline. The laminar burning velocities of iso-octane, n-heptane, and toluene were calculated under wide thermo-chemical conditions in conjunction with detailed chemical reaction kinetics in the premixed flame simulation. Finally, a set of laminar burning velocity model equations was derived by curve-fitting the flame simulation results of each hydrocarbon component in consideration of the effect of temperature, pressure, and diluent. The laminar burning velocity model was validated against the measurement data of gasoline’s laminar burning velocity found in the literature, and was applied to the computational fluid dynamics simulation of a direct-injection spark-ignition engine under the various operating conditions to explore the prediction capability.

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Numerical study and correlation development on laminar burning velocities of n-butanol, iso-octane and their blends: Focusing on diluent and blend ratio effects

Cited by 31 publications

References 48 publications

A Comparison of EGR Correction Factor Models Based on SI Engine Data

A Comparison of EGR Correction Factor Models Based on SI Engine Data

Flame front analysis of ethanol, butanol, iso-octane and gasoline in a spark-ignition engine using laser tomography and integral length scale measurements

Modeling laminar burning velocity of gasoline using an energy fraction-based mixing rule approach

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