The turbulent burning velocity of iso-octane/air mixtures

Lawes, M.; Ormsby, M. P.; Sheppard, C. G. W.; Woolley, Robert

doi:10.1016/j.combustflame.2011.12.023

Cited by 65 publications

(55 citation statements)

References 32 publications

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“…As noted by previous workers there are observable differences in way in which flames of different  propagate [20]. The lean flames,  = 0.8, can be seen to be distorted by the turbulent flow field (i.e.…”

Section: Turbulent Burning Velocitymentioning

confidence: 64%

Turbulent burning rates of gasoline components, Part 1 – Effect of fuel structure of C6 hydrocarbons

Burluka

Gaughan

Griffiths

et al. 2016

Fuel

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Section: Turbulent Burning Velocitymentioning

confidence: 64%

Turbulent burning rates of gasoline components, Part 1 – Effect of fuel structure of C6 hydrocarbons

Burluka

Gaughan

Griffiths

et al. 2016

Fuel

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“…1(b) shows an opposite trend of the smallest S 0 Lu and the largest δ f for the stoichiometric CH 4 flame. It is due to the addition of N 2 to maintain fixed S 0 Lu for mixtures 25 Lawes et al (6)(7)(8), 26 , 27 Wang et al (12)(13)(14)(15)(16), 28 , 29 Chiu et al (22)(23)(24)(25)(26)(27), 30 Venkateswaran et al (28)(29)(30)(31), 31 and Fairweather et al (32)(33)(34)(35). 32 Case of different equivalence ratios.…”

Section: Resultsmentioning

confidence: 96%

“…(4), (7), and (9) are evaluated by comparing them with data in Aldredge et al, 25 Lawes et al, 26 Kido et al, 27 Wang et al, 28 Kobayashi et al, 29 Chiu et al, 30 Venkateswaran et al, 31 and Fairweather et al 32 Table I Table I represent different fuels or experimental setups and, respectively, involve 50, 13,14,8,16,22,17,24,32, and 20 data points with a total of 216 S T measurements. The cases, 1, 6,9,12,15,17,20,27,28, and 32, are the reference cases for normalization of measured and predicted parameters in Sec.…”

Section: Selected Experimental Casesmentioning

confidence: 99%

“…Parametric study was performed for u ′ up to 1.05 m/s at the equivalence ratios of 0.8, 0.9, 1.0, 1.1, and 1.2. The laminar flame speed was varied with the maximum S 0 Lu occurring for the slightly rich mixture of the equivalence ratio, 1.1, as listed in Table I 25 Lawes et al (6)(7)(8), 26 Kido et al (9)(10)(11), 27 Wang et al (12)(13)(14)(15)(16), 28 Kobayashi et al (17)(18)(19)(20)(21), 29 Chiu et al (22)(23)(24)(25)(26)(27), 30 Venkateswaran et al (28)(29)(30)(31), 31 Kido et al 27 measured the turbulent burning velocities of CH 4 /N 2 /O 2 mixtures for flames growing in a nearly spherical vessel. Turbulent intensity was varied for each of the equivalence ratios, 0.7, 0.9, and 0.98, while keeping S 0 Lu as about 15 cm/s by adjusting the N 2 fraction.…”

Section: Selected Experimental Casesmentioning

confidence: 99%

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Asymptotic expressions for turbulent burning velocity at the leading edge of a premixed flame brush and their validation by published measurement data

Lee

Huh

2014

Physics of Fluids

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This paper presents validation of new analytical expressions for the turbulent burning velocity, S T , based on asymptotic behavior at the leading edge (LE) in turbulent premixed combustion. Reaction and density variation are assumed to be negligible at the LE to avoid the cold boundary difficulty in the statistically steady state. Good agreement is shown for the slopes, dS T /du ′ , with respect to L c /δ f at low turbulence, with both normalized by those of the reference cases. δ f is the inverse of the maximum gradient of reaction progress variable through an unstretched laminar flame, and L c is the characteristic length scale given as burner diameter or measured integral length scale. Comparison is made for thirty-five datasets involving different fuels, equivalence ratios, H 2 fractions in fuel, pressures, and integral length scales from eight references [R. C. Aldredge et al., "Premixed-flame propagation in turbulent Taylor-Couette flow," Combust. Flame 115, 395 (1998); M. Lawes et al., "The turbulent burning velocity of iso-octane/air mixtures," Combust. Flame 159, 1949 (2012); H. Kido et al., "Influence of local flame displacement velocity on turbulent burning velocity," Proc. Combust. Inst. 29, 1855 (2002); J. Wang et al., "Correlation of turbulent burning velocity for syngas/air mixtures at high pressure up to 1.0 MPa," Exp. Therm. Fluid Sci. 50, 90 (2013); H. Kobayashi et al., "Experimental study on general correlation of turbulent burning velocity at high pressure," Proc. Combust. Inst. 27, 941 (1998); C. W. Chiu et al., "High-pressure hydrogen/carbon monoxide syngas turbulent burning velocities measured at constant turbulent Reynolds numbers," Int. J. Hydrogen Energy 37, 10935 (2012); P. Venkateswaran et al., "Pressure and fuel effects on turbulent consumption speeds of H2/CO blends," Proc. Combust. Inst. 34, 1527 (2013); M. Fairweather et al., "Turbulent burning rates of methane and methane-hydrogen mixtures," Combust. Flame 156, 780 (2009)]. The turbulent burning velocity is shown to increase as the flamelet thickness, δ f , decreases at a high pressure, for an equivalence ratio slightly rich or close to stoichiometric and for mixture of a high H 2 fraction. Two constants involved are C to scale turbulent diffusivity as a product of turbulent intensity and characteristic length scale and C s to relate δ f with the mean effective L m . L m = D mu /S 0 Lu is the scale of exponential decay at the LE of an unstretched laminar flame. The combined constant, KC/C s , is adjusted to match measured turbulent burning velocities at low turbulence in each of the eight different experimental setups. All measured S T /S 0 Lu values follow the line, K D t u /D mu + 1, at low turbulent intensities and show bending below the line due to positive mean curvature and broadened flamelet thickness at high turbulent intensities. Further work is required to determine the constants, C s and K, and the factor, L m /L * m − L m ⟨∇ · n⟩ f , that is responsible for bending in different conditions of laminar flamelet and incom...

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“…A study with iso-octane demonstrated that a selection of the existing expressions were unable to capture the trend of u t with φ [41]. A number of workers have attempted approximate quantification of the influence of Markstein number on burn rate for turbulent premixed combustion [42][43].…”

Section: Turbulent Burning Velocitymentioning

confidence: 99%

Turbulent burning rates of gasoline components, Part 2 – Effect of carbon number

Burluka

Gaughan

Griffiths

et al. 2016

Fuel

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Experimental measurements of turbulent and laminar burning velocities have been made for premixed hydrocarbon-air flames of straight chain molecules of increasing carbon number (from n-pentane to n-octane). Measurements were performed at 0.5 MPa, 360 K and rms turbulent velocities of 2 and 6 m/s, for a range of equivalence ratios. The laminar burning velocities were used to interpret the turbulent data, but were also found to be broadly in line with those of previous workers. At lean conditions the turbulent burning velocity was measured to be similar between the four alkanes studied. However, at rich conditions there were notable differences between the turbulent burn rates of the fuels. The equivalence ratio of the mixtures at which the maximum burning velocities occurred in the turbulent flames was richer than that under laminar conditions. The equivalence ratio of the peak turbulent burning velocity was found to be a function of the carbon number of the fuel and the turbulent intensity and became gradually fuel rich with increases in each of these values.

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The turbulent burning velocity of iso-octane/air mixtures

Cited by 65 publications

References 32 publications

Turbulent burning rates of gasoline components, Part 1 – Effect of fuel structure of C6 hydrocarbons

Turbulent burning rates of gasoline components, Part 1 – Effect of fuel structure of C6 hydrocarbons

Asymptotic expressions for turbulent burning velocity at the leading edge of a premixed flame brush and their validation by published measurement data

Turbulent burning rates of gasoline components, Part 2 – Effect of carbon number

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