Nonlinear effects in the extraction of laminar flame speeds from expanding spherical flames

Kelley, Andrew; Law, Chung K.

doi:10.1016/j.combustflame.2009.04.004

Cited by 439 publications

(167 citation statements)

References 20 publications

Supporting

Mentioning

158

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, the present results are slightly lower than the data of n-butaneair mixtures obtained by Davis et al [10] and in good agreement with n-butane data of Kelley et al [8]. As shown in Figure 7, the n-butane-air mixtures shows higher laminar burning velocity compaired to iso-butane-air mixtures and this difference is due to the higher heat of combustion for n-butane than iso-butane.…”

Section: Stretched Flame Propagation Speeds and Laminar Burning Velocitycontrasting

confidence: 55%

“…Thus, the measured laminar burning velocities of iso-butane-air flames of present work were compared with data of iso-butane and n-butane-air mixtures from previous literature to validate the present data. In order to measure the values of the laminar burning velocities from the obtained unstretched flame propagation speed, the following equation was used [8]: The values of the laminar burning velocity ܵ of isobutane-air mixtures which have been extracted using the Eq. 2.4 are plotted in Figure 7 against the equivalence ratio.…”

Section: Stretched Flame Propagation Speeds and Laminar Burning Velocitymentioning

confidence: 99%

“…Furthermore, Miao et al [2] reported that the laminar burning velocity of LPG-air is increased significantly with hydrogen addition, while the flame thickness decreased with hydrogen addition. Kelley et al [8] studied the nonlinear effects in the dynamic nature of laminar burning velocity of n-butane-air mixtures. They reported that the accuracy and feasibility of the extrapolation of n-butane enhanced by using smaller ignition energies and larger chambers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Stretched Flame Propagation Speeds and Laminar Burning Velocitycontrasting

confidence: 55%

Section: Stretched Flame Propagation Speeds and Laminar Burning Velocitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…(3) may be different from those obtained from non-linear relationship between u n and u l . However, Kelley and Law (13) showed that the difference of unstretched laminar burning velocity was not so much and the sign of Markstein length was the same as that obtained from Eq. (3).…”

Section: Analysis Of Laminar Flamesmentioning

confidence: 90%

“…(4), the sensitivity of stretched laminar burning velocity to flame stretch was discussed using burned gas Markstein length. In addition, the nonlinearity of the sensitivity of laminar burning velocity to flame stretch was pointed out (13), (14) . The results of unstretched laminar burning velocity and Markstein length obtained from Eq.…”

Section: Analysis Of Laminar Flamesmentioning

confidence: 99%

Analysis of Turbulent Burning Velocity of Spherically Propagating Premixed Flame with Effective Turbulence Intensity

Hayakawa

Miki

Nagano

et al. 2012

JTST

View full text Add to dashboard Cite

Burning velocity of spherically propagating turbulent flames kept increasing with flame propagation. On the other hand, turbulent burning velocity obtained from burner stabilized flame is constant for a given turbulence intensity. This difference of turbulent burning velocity characteristic was discussed by Abdel-Gayed and Bradley et al. For spherically propagating flames, not all turbulent eddies contribute to the turbulence that affect the turbulent flame. Small flames may be wrinkled only by small scale turbulent eddies. As the flame propagates, it becomes progressively wrinkled by the larger eddies. The turbulence which contributes to turbulent flame may increase with the increase in flame radius. This increase in turbulence may cause the increase in turbulent burning velocity. The effective turbulence intensity was proposed by Abdel-Gayed and Bradley et al. as the turbulence intensity which contributes effectively to turbulent flame. In this study, the turbulence characteristics which are necessary for obtaining the effective turbulence intensity were evaluated by Particle Image Velocimetry (PIV) measurement. Then turbulent burning velocity of iso-octane/air flame was investigated with effective turbulence intensity. The turbulent burning velocity increased with the increase in effective turbulence intensity. The increase in turbulent burning velocity may be caused by the increase in flame front area with increase in the effective turbulence intensity.

show abstract

Combustion Fundamentals

Janbozorgi

Far

Metghalchi

2010

Handbook of Combustion

View full text Add to dashboard Cite

The sections in this article are Introduction Combustion Thermodynamics Enthalpy of Reaction Flame Temperature Chemical Equilibrium Chemical Kinetics Combustion Chemical Reactions Kinetic Rate Equations Chemical Time Scales and Nonequilibrium Effects Kinetics Simplification and Reduction Rate‐Controlled Constrained‐Equilibrium ( RCCE ) Method Laminar Premixed Flames Governing Equations Experimental Approach Laminar Burning Speed Measurement Techniques Diffusion Flames Conclusions

show abstract

Nonlinear effects in the extraction of laminar flame speeds from expanding spherical flames

Cited by 439 publications

References 20 publications

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

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

Analysis of Turbulent Burning Velocity of Spherically Propagating Premixed Flame with Effective Turbulence Intensity

Combustion Fundamentals

Contact Info

Product

Resources

About