Effect of iso-octane/methane blend on laminar burning velocity and flame instability

Baloo, M.; Dariani, Bijan Mollaei; Akhlaghi, Mehdi; Chitsaz, Iman

doi:10.1016/j.fuel.2014.11.043

Cited by 37 publications

(17 citation statements)

References 35 publications

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“…Figure 2a,b gives the laminar flame speeds of pure ethanol and isooctane flames at 0.1 MPa, respectively. It is seen the present data are in good agreement with the data from literatures [10,[46][47][48][49][50]. Figure 2c gives the laminar flame speeds of ethanol-isooctane blend-air mixtures versus volume fraction of ethanol at 0.1 MPa.…”

Section: Laminar Flame Speedsupporting

confidence: 90%

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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Section: Laminar Flame Speedsupporting

confidence: 90%

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

Jin

Huang

2016

Energies

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“…Figure 4 shows the stretched flame propagation speed against flame radius at wide range of equivalence ratios and ambient conditions for iso-butane-air flames. The stretched flame propagation speed, ܵ was obtained using the following equation [12]:…”

Section: Stretched Flame Propagation Speeds and Laminar Burning Velocitymentioning

confidence: 99%

An Experimental Measurement on Laminar Burning Velocities and Markstein Length of Iso-Butane-Air Mixtures at Ambient Conditions

Yousif

Sulaiman

Nasif

2016

MATEC Web of Conferences

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Abstract. In the present work, experimental investigation on laminar combustion of iso-butane-air mixtures was conducted in constant volume explosion vessel. The experiments were conducted at wide range of equivalence ratios ranging between Ф = 0.6 and 1.4 and atmospheric pressure of 0.1 MPa and ambient temperature of 303K. Using spherically expanding flame method, flame parameters including stretched, unstretched flame propagation speeds, laminar burning velocities and Markstein length were calculated. For laminar burning velocities the method of error bars of 95% confidence level was applied. In addition, values of Markstein lengths were measured in wide range of equivalence ratios to study the influence of stretch rate on flame instability and burning velocity. It was found that the stretched flame speed and laminar burning velocities increased with equivalence ratios and the peak value was obtained at equivalence ratio of Ф = 1.1. The Markstein length decreased with the increases in equivalence ratios, which indicates that the diffusion thermal flame instability increased at high equivalence ratios in richer mixture side. However, the total deviations in the laminar burning velocities have discrepancies of 1.2-2.9% for all investigated mixtures.

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“…A common approach of measuring burning velocity and Markstein length in a combustion vessel has been the constant pressure outwardly propagating spherical flame method (10)(11)(12)(13)(14)(15)(16)18,19). The method is suitable for extrapolation of measured stretched burning velocities to their fundamental non-stretched values and the associate Markstein lengths, due to the welldefined stretch rates of an outwardly spherical flame.…”

Section: Flame Theorymentioning

confidence: 99%

“…The authors are only aware about the recent study of Baloo et al (19) reporting the laminar flame velocities and Markstein lengths of methane-isooctane dual fuels at various equivalence ratios. The experiments have been conducted at atmospheric pressure, and a temperature of 363 K. It has been…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Laminar Burning Velocities and Markstein Lengths of Methane and PRF95 Dual Fuels

et al. 2016

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Natural gas is a promising alternative fuel. The main constituent of natural gas is methane. The slow burning velocity of methane poses significant challenges for its utilization in future energy efficient combustion applications. The effects of methane addition to PRF95 on the fundamental combustion parameters, laminar burning velocity (S u 0 ) and Markstein length (L b ), were experimentally investigated in a cylindrical combustion vessel at equivalence ratios of 0.8, 1, and 1.2, initial pressures of 2.5, 5, and 10 bar, and a constant temperature of 373 K. Methane was added to PRF95 in three different energy ratios 25%, 50%, and 75%. Spherically expanding flames were used to derive the flow-corrected flame velocities, from which the corresponding L b and S u 0 were obtained. The flame velocities were corrected for the motion of burned gas induced by the cylindrical confinement. It has been found that at stoichiometric conditions there is a linear decrease in L b and S u 0 with the dual fuel (DF) ratio in all investigated pressures. At rich conditions, all DFs resulted in having lower S u 0 as compared to methane and to a larger extent PRF95. The values of L b for all DFs were lower than methane and comparable to those of PRF95. At lean conditions, the values of L b for all DFs are biased toward those of methane whereas the values of S u 0 are found to be higher than those of PRF95 at pressures of 2.5 and 5 bar. At 10 bar both L b and S u 0 reduce with DF ratio although S u 0 of all DFs converge to that of PRF95. The findings of the current study indicate a distinct synergy in the utilization of dual fueling in future lean burn energy efficient combustion applications.

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Effect of iso-octane/methane blend on laminar burning velocity and flame instability

Cited by 37 publications

References 35 publications

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

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

An Experimental Measurement on Laminar Burning Velocities and Markstein Length of Iso-Butane-Air Mixtures at Ambient Conditions

Experimental Investigation on the Laminar Burning Velocities and Markstein Lengths of Methane and PRF95 Dual Fuels

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