Measurements of the laminar burning velocity for mixtures of methanol and air from a constant-volume vessel using a multizone model

Saeed, Khizer; Stone, C. R.

doi:10.1016/j.combustflame.2004.08.008

Cited by 99 publications

(74 citation statements)

References 14 publications

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“…They concluded that the burning velocity decreases with the increase in pressure. Their work agreed well with the work carried out by Saeed and Stone 13 and Andrews and Bradley. 30 The initial temperature dependence on burning velocity was investigated by different researchers 13,20,31,32 using tube method and constant volume vessel.…”

Section: Previous Studiessupporting

confidence: 88%

“…Their work agreed well with the work carried out by Saeed and Stone 13 and Andrews and Bradley. 30 The initial temperature dependence on burning velocity was investigated by different researchers 13,20,31,32 using tube method and constant volume vessel. They showed that burning velocity of hydrocarbon-air mixtures increases with the initial mixture temperature and is mainly due to the preheating effect which increases the heat release rate as a result of increasing the initial enthalpies of reacting materials.…”

Section: Previous Studiessupporting

confidence: 88%

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Measurements of the laminar burning velocity for propane: Air mixtures

Ebaid

Al-khishali

2016

Advances in Mechanical Engineering

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In this research, an experimental setup was built based on using K-type thermocouples inserted in a cylindrical vessel and coupled with a computer system to enable online reading of flame speed for propane-air mixtures. The work undertaken here has come up with data for laminar burning velocity of the propane-air mixtures based on three initial temperatures T u = 300, 325 and 350 K, three initial pressures p u = 0.5, 1.0 and 1.5 bar over a range of equivalence ratios f between 0.6 and 1.5. The results obtained gave a reasonable agreement with experimental data reported in the literature. Results showed that laminar burning velocity increases at low initial pressures and decreases at high pressures, while the opposite occurs incase of temperatures. The maximum values of the laminar burning velocity occur at T = 350 K, p u = 0.5 and f = 1.0, respectively, while the minimum values of the laminar burning velocity occur at T = 300 K, p u = 1.5 and f = 1.2. Also, the influence of flame stretching on laminar burning velocity was investigated and it was found that stretch effect is weak since Lewis number was below unity for all cases considered. Based on experimental results, an empirical equation has been derived to calculate the laminar burning velocity. The values of the laminar burning velocity calculated from this equation show great compatibility with the published results. Therefore, the derived empirical equation can be used to calculate the burning velocities of any gas of paraffin gas fuels in the range of mixture temperature and pressure considered.

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Section: Previous Studiessupporting

confidence: 88%

Section: Previous Studiessupporting

confidence: 88%

Measurements of the laminar burning velocity for propane: Air mixtures

Ebaid

Al-khishali

2016

Advances in Mechanical Engineering

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“…Recently, studies on the laminar flames of alcohols have received increasing attention. Saeed and Stone [19] and Zhang et al [20] studied the laminar flames of methanol in a constant volume chamber with laminar flame speeds at different determined initial temperatures and pressures. Togbé et al [21] presented a set of laminar flame speeds of n-pentanol at 0.1 MPa, 423 K to evaluate the accuracy of the n-pentanol model.…”

Section: Introductionmentioning

confidence: 99%

Laminar Flame Characteristics of C1–C5 Primary Alcohol-Isooctane Blends at Elevated Temperature

Jin

Huang

2016

Energies

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Abstract:The laminar combustion characteristics of blends of isooctane and C1-C5 primary alcohols (i.e., methanol, ethanol, n-propanol, n-butanol and n-pentanol) were investigated using the spherical expanding flame methodology in a constant volume chamber at various equivalence ratios and volume fractions of alcohol. The stretch effect was removed using the nonlinear methodology. The results indicate that the laminar flame speeds of alcohol-isooctane blends increase monotonously with the increasing volume fraction of alcohol. Among the five alcohols, the addition of methanol is identified to be the most effective in enhancing laminar flame speed. The addition of ethanol results in an approximately equivalent laminar flame speed enhancement rate as those of n-propanol, n-butanol and n-pentanol at ratios of 0.8 and 1.5, and a higher rate at 1.0 and 1.2. An empirical correlation is provided to describe the laminar flame speed variation with the volume fraction of alcohol. Meanwhile, the laminar flame speed increases with the mass content of oxygen in the fuel blends. At the equivalence ratio of 0.8 and fixed oxygen content, similar laminar flame speeds are observed with different alcohols blended into isooctane. Nevertheless, with the increase of equivalence ratio, heavier alcohol-isooctane blends tend to exhibit higher values. Markstein lengths of alcohol-isooctane blends decrease with the addition of alcohol into isooctane at 0.8, 1.0 and 1.2, however they increase at 1.5. This is consistent with the behavior deduced from the Schlieren images.

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“…Figure 1 shows the comparison between the calculated laminar flame speed of the methanol-air mixtures by using the extended methanol oxidation mechanism and that of the experimental results by Metghalchi and Keck [7], Saeed and Stone [9], and Zhang et al [15]. It can be seen that the extended methanol oxidation mechanism can well reproduce the laminar flame speed of the methanol-air mixtures under lean and stoichiometric conditions with a relative error of 8%.…”

Section: Mechanism Validation and Computational Methodsmentioning

confidence: 68%

“…Meanwhile, some researches focused on the fundamental combustion theory of the methanol-air flames were also reported, such as the laminar flame speed, the flame instability behavior and the methanol kinetic mechanisms, etc. Metghalchi and Keck [7], Saeed and Stone [8], and Gülder [9] measured the burning velocities of methanol-air mixtures in closed combustion bombs under certain conditions. However, in those previous studies, continuous observations of flame development process were not always implemented, and the laminar burning velocities were generally determined by resolving various combustion models based on combustion pressure traces.…”

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confidence: 99%

Numerical study on combustion of diluted methanol-air premixed mixtures

et al. 2010

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The effect of nitrogen dilution on the premixed combustion characteristics and flame structure of laminar premixed methanol-air-nitrogen mixtures are analyzed numerically based on an extended methanol oxidation mechanism. The laminar burning velocities, the mass burning fluxes, the adiabatic flame temperature, the global activation temperature, the Zeldovich number, the effective Lewis number and the laminar flame structure of the methanol-air-nitrogen mixtures are obtained under different nitrogen dilution ratios. Comparison between experiments and numerical simulations show that the extended methanol oxidation mechanism can well reproduce the laminar burning velocities for lean and near stoichiometric methanol-air-nitrogen mixtures. The laminar burning velocities and the mass burning fluxes decrease with the increase of nitrogen dilution ratio and the effect is more obvious for the lean mixture. The effective Lewis number of the mixture increases with the increase of nitrogen dilution ratio, and the diffusive-thermal instability of the flame front is decreased by the nitrogen addition. Nitrogen addition can suppress the hydrodynamic instability of methanol-air-nitrogen flames. The decrease of the mole fraction of OH and H is mainly responsible for the suppressed effect of nitrogen diluent on the chemical reaction in the methanol-air-nitrogen laminar premixed flames, and the NO x and formaldehyde emissions are decreased by the nitrogen addition. methanol, dilution, premixed combustion, numerical analysis Citation:Zheng J J, Zhang Z Y, Huang Z H, et al. Numerical study on combustion of diluted methanol-air premixed mixtures.

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Measurements of the laminar burning velocity for mixtures of methanol and air from a constant-volume vessel using a multizone model

Cited by 99 publications

References 14 publications

Measurements of the laminar burning velocity for propane: Air mixtures

Measurements of the laminar burning velocity for propane: Air mixtures

Laminar Flame Characteristics of C1–C5 Primary Alcohol-Isooctane Blends at Elevated Temperature

Numerical study on combustion of diluted methanol-air premixed mixtures

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