Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Rokni, Emad; Moghaddas, Ali; Askari, Omid; Metghalchi, Hameed

doi:10.1115/es2014-6448

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…After solving properties of burned gases, S L can be calculated from the measured pressure time histories. The stretch effects are not considered in this study because several studies , have shown that the stretch effect approaches zero asymptotically with the increasing radius of curvature and was negligible in the constant volume method. A linear extrapolation between S L and the unburned gas temperature was used to calculate S L at an initial temperature of 428 K in a stretch-free region (see Figure ).…”

Section: Methodsmentioning

confidence: 99%

Experimental and Kinetic Modeling Study of Laminar Burning Velocities of Cyclopentanone and Its Binary Mixtures with Ethanol and n-Propanol

et al. 2020

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Cyclopentanone is a promising biofuel that can enable more efficient engine operation and increase the fuel economy of the light duty fleet over current and planned technology developments. While the ignition of cyclopentanone has been investigated in detail, more studies on the laminar burning velocities of cyclopentanone are called for. In this work, the laminar burning velocities of cyclopentanone (C5H8O) have been measured using the heat flux and spherical flame methods at 1 atm, equivalence ratios from 0.7 to 1.6, and initial temperatures of 328, 353, and 428 K. To further investigate the relationship between the molecular structure and laminar burning velocity, identical experiments were also performed for binary mixtures of cyclopentanone with ethanol and n-propanol at 1:1 (mol). The consistency between the experimental data sets obtained in this work and literature data sets has been evaluated. A recently published mechanism of cyclopentanone was used for simulation after adopting the submechanism of n-propanol. Good agreement has been seen between experimental and simulated results for all flames. To qualitatively explain the characteristics of the laminar burning velocity of cyclopentanone and the differences with those of ethanol and n-propanol, sensitivity analysis and reaction pathway analysis have been performed to compare the chemistry of the fuels under flame conditions, which revealed how the molecular structure of cyclopentanone could affect its laminar burning velocity. Compared to ethanol and n-propanol, cyclopentanone does not have primary carbon atoms in its molecule, leading to lower production of methyl radicals. Meanwhile, the carbonyl group in the cyclopentanone molecule is mostly released as CO in the decomposition of multiple intermediates accompanied by the production of unsaturated C2 and C4 species, especially C2H4 and C2H3. Both features contribute to the high laminar burning velocity of cyclopentanone.

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Section: Methodsmentioning

confidence: 99%

Experimental and Kinetic Modeling Study of Laminar Burning Velocities of Cyclopentanone and Its Binary Mixtures with Ethanol and n-Propanol

et al. 2020

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“…Laminar burning velocity, a fundamental phenomenon in premixed combustion, plays a key role in understanding a mixture's reactivity, diffusivity, and exothermicity [16][17][18]. It is used in turbulent combustion models to study the turbulent flame propagation, emissions production, and flame morphological structure and instability.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Working Fluids on Premixed Hydrogen Combustion in a Constant Volume Combustion Chamber

Morovatiyan¹,

Shahsavan²,

Aguilar³

et al. 2019

Preprint

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Premixed combustion of hydrogen was investigated with the purpose of examining the effect of the full or partial substitution of argon for nitrogen in air on laminar burning velocity. Theoretically, this partial replacement decreases the NOx emissions and increases the thermal efficiency of internal combustion engines due to the high specific heat ratio of noble gases. An optically-accessible constant volume combustion chamber (CVCC) with central ignition was used to study flame propagation, flame morphological structure, and instability. The spherical flame development was studied using a high-speed Z-type Schlieren visualization system. Moreover, a numerical model was developed to convert the pressure rise data to laminar burning velocity. Coupling the model to a chemical equilibrium code aids in determining the burned gas properties. The experimental and numerical investigations indicate that increasing the concentration of argon as the working fluid in the mixture can increase the laminar burning velocity and extend the lean flammability limit.

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Understanding the Effect of Capacitive Discharge Ignition on Plasma Formation and Flame Propagation of Air–Propane Mixture

Kim

Askari

2019

Journal of Energy Resources Technology

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This work is an experimental and computational study to investigate the effect of capacitive discharge ignition (CDI) on plasma kernel formation and flame propagation of air–propane mixture. This paper is mainly focused on the plasma formation and flame propagation characteristics, pressure rise, propagation time, velocity field, and species concentrations. A conventional ignition system is used for comparison purpose. A constant volume combustion chamber with volume of 400 cm3 is designed for experimental study. This chamber is utilized to visualize the plasma formation as well as the flame propagation induced from two ignition sources. The experiments are performed in a wide range of operating conditions, i.e., initial pressure of 2–4 bar, temperature of 300 K, chamber wall temperature of 350 K, spark plug gaps of 1.0–1.5 mm, discharge duration of 1 ms, discharge energy of 500 mJ, and equivalence ratio of 0.5–1.0. The computational study is performed by ANSYS fluent using the partially premixed combustion (PPC) model having the same conditions as experimental study. It is shown that the average peak pressure in CDI increased by 5.79%, 4.84% and 4.36% at initial pressures of 2, 3, and 4 bar, respectively, comparing with conventional ignition. It could be determined that the impact of combustion pressure in CDI system is more significant than conventional ignition particularly in lean mixtures. Consequently, the flame propagation rate in CDI system, due to the large ionized kernel around the spark plug, can be significantly enhanced.

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Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Cited by 4 publications

References 8 publications

Experimental and Kinetic Modeling Study of Laminar Burning Velocities of Cyclopentanone and Its Binary Mixtures with Ethanol and n-Propanol

Experimental and Kinetic Modeling Study of Laminar Burning Velocities of Cyclopentanone and Its Binary Mixtures with Ethanol and n-Propanol

The Effect of Working Fluids on Premixed Hydrogen Combustion in a Constant Volume Combustion Chamber

Understanding the Effect of Capacitive Discharge Ignition on Plasma Formation and Flame Propagation of Air–Propane Mixture

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