Experimental and numerical determination of laminar flame speeds: Mixtures of C2-hydrocarbons with oxygen and nitrogen

Egolfopoulos, Fokion N.; Zhu, Daniel; Law, Chung K.

doi:10.1016/s0082-0784(06)80293-6

Cited by 180 publications

(99 citation statements)

References 26 publications

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“…Figure 3b gives the variation of laminar flame speed as a function of fuel=air equivalence ratio at a mixture temperature of 298 K and a pressure of 1 atm. A satisfactory agreement is observed between the predictions and the experimental data obtained by Egolfopoulos et al (1991), with the maximum discrepancy being 12%. …”

Section: Combustion Of Ethylene In a Supersonic Combustor 551supporting

confidence: 72%

Numerical Simulation of Ignition and Combustion of Ethylene in a Supersonic Model Combustor with a Reduced Kinetic Mechanism

Zhong

Zhang

et al. 2013

Combustion Science and Technology

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Section: Combustion Of Ethylene In a Supersonic Combustor 551supporting

confidence: 72%

Numerical Simulation of Ignition and Combustion of Ethylene in a Supersonic Model Combustor with a Reduced Kinetic Mechanism

Zhong

Zhang

et al. 2013

Combustion Science and Technology

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“…Additional computational cost savings are achieved when additional reduction using quasi-steady state assumptions and dynamic stiffness removal are accomplished. To further validate the accuracy of the derived reduced mechanism, measured laminar flame speeds [34] are compared in Figure 4, showing good agreement.…”

Section: Gas-phase Kinetic Mechanismmentioning

confidence: 83%

A computational study of ethylene–air sooting flames: Effects of large polycyclic aromatic hydrocarbons

Selvaraj

Arias

Lee

et al. 2016

Combustion and Flame

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An updated reduced gas-phase kinetic mechanism was developed and integrated with aerosol models to predict soot formation characteristics in ethylene nonpremixed and premixed flames. A primary objective is to investigate the sensitivity of the soot formation to various chemical pathways for large polycyclic aromatic hydrocarbons (PAH). The gas-phase chemical mechanism adopted the KAUST-Aramco PAH Mech 1.0, which utilized the AramcoMech 1.3 for gas-phase reactions validated for up to C2 fuels. In addition, PAH species up to coronene (C 24 H 12 or A7) were included to describe the detailed formation pathways of soot precursors. In this study, the detailed chemical mechanism was reduced from 397 to 99 species using directed relation graph with expert knowledge (DRG-X) and sensitivity analysis. The method of moments with interpolative closure (MOMIC) was employed for the soot aerosol model. Counterflow nonpremixed flames at low strain rate sooting conditions were considered, for which the sensitivity of soot formation characteristics to different nucleation pathways were investigated. Premixed flame experiment data at different equivalence ratios were also used for validation. The findings show that higher PAH concentrations result in a higher soot nucleation rate, and that the total soot volume and average size of the particles are predicted in good agreement with experimental results. Subsequently, the effects of different pathways, with respect to pyrene-or coronene-based nucleation models, on the net soot formation rate were analyzed. It was found that the nucleation processes (i.e., soot inception) are sensitive to the choice of PAH precursors, and consideration of higher PAH species beyond pyrene is critical for accurate prediction of the overall soot formation.

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“…In the study of Wu & Wang [32], u l was taken to be 5.5 m s −1 under atmospheric conditions. Some data on the variations of u l for ethylene-air with temperature are given by Kumar et al [49] and with pressure by Egolfopoulos et al [50] and Jomaas et al [51]. Extrapolating the expressions for these variations to much higher temperatures and pressures, and assuming that they apply to ethylene-oxygen mixtures, gave a value of u l of 52 m s −1 corresponding to the CJ speed, and one of 31 m s −1 corresponding to the initial autoignition speed.…”

Section: Values Of the Turbulent Burning Velocitymentioning

confidence: 99%

Autoignitions and detonations in engines and ducts

Bradley

2012

Phil. Trans. R. Soc. A.

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The origins of autoignition at hot spots are analysed and the pressure pulses that arise from them are related to knock in gasoline engines and to developing detonations in ducts. In controlled autoignition engines, autoignition is benign with little knock. There are several modes of autoignition and the existence of an operational peninsula, within which detonations can develop at a hot spot, helps to explain the performance of various engines. Earlier studies by Urtiew and Oppenheim of the development of autoignitions and detonations ahead of a deflagration in ducts are interpreted further, using a simple one-dimensional theory of the generation of shock waves ahead of a turbulent flame. The theory is able to indicate entry into the domain of autoignition in an 'explosion in the explosion'. Importantly, it shows the influence of the turbulent burning velocity, and particularly its maximum attainable value, upon autoignition. This value is governed by localized flame extinctions for both turbulent and laminar flames. The theory cannot show any details of the transition to a detonation, but regimes of eventually stable or unstable detonations can be identified on the operational peninsula. Both regimes exhibit transverse waves, triple points and a cellular structure. In the case of unstable detonations, transverse waves are essential to the continuing propagation. For hazard assessment, more needs to be known about the survival, or otherwise, of detonations that emerge from a duct into the same mixture at atmospheric pressure.

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Experimental and numerical determination of laminar flame speeds: Mixtures of C2-hydrocarbons with oxygen and nitrogen

Cited by 180 publications

References 26 publications

Numerical Simulation of Ignition and Combustion of Ethylene in a Supersonic Model Combustor with a Reduced Kinetic Mechanism

Numerical Simulation of Ignition and Combustion of Ethylene in a Supersonic Model Combustor with a Reduced Kinetic Mechanism

A computational study of ethylene–air sooting flames: Effects of large polycyclic aromatic hydrocarbons

Autoignitions and detonations in engines and ducts

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