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

Burluka, Alexey; Gaughan, R. G.; Griffiths, J. F.; Mandilas, C.; Sheppard, C. G. W.; Woolley, Robert

doi:10.1016/j.fuel.2015.11.020

Fuel

2016

DOI: 10.1016/j.fuel.2015.11.020

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

Alexey Burluka

R. G. Gaughan

J. F. Griffiths

et al.

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Cited by 19 publications

(20 citation statements)

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“…Hence, we have extended 82 the earlier studies [6,7] through comparisons of laminar and turbulent velocity of n-hexane and 83 n-octane (i.e. n-C 6 H 14 and n-C 8 H 18 ) with those of their fully deuterated forms (i.e.…”

mentioning

confidence: 82%

“…As discussed in Section 3.1, the unstretched laminar burning velocity of 2,2 dimethyl butane has 298 been found to be ~15% lower than that of n-hexane for near stoichiometric conditions, at 0.5 MPa 299 and 360 K [6]. However, at the same equivalence ratio, pressure and temperature, the turbulent 300 burning velocity of 2,2 dimethyl butane was only ~9% lower than that of n-hexane (at u' = 2 m/s 301 and 6 m/s).…”

mentioning

confidence: 88%

“…The 255 thermodynamic data required for the calculations were provided by ExxonMobil [41]. Collision A similar reduction of the differences between the burn rates of various hydrocarbon fuels when 295 moving from laminar to turbulent conditions was reported in the previous paper [6] of the overall study, which addressed the influence of molecular structure for a series of C 6 hydrocarbon fuels.…”

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confidence: 90%

“…As in the previous 99 studies for the examination of fuel structure and chain length effects on burn rate [6][7], 100 measurements were performed at elevated temperature and pressure (360 K and 0.5 MPa), at 101 which the premixed turbulent flames demonstrate behaviour similar to flames in spark-ignition 102 engines [22]. Owing to the high cost of the deuterated fuels, the alkane tests were undertaken at to that reported in [32] and is typical of the magnitude of cycle-to-cycle variation of the burning 145 rate in an SI engine [33].…”

mentioning

confidence: 95%

“…(i) isomeric structure and bonding through experimental studies of seven different hydrocarbons 74 containing six carbon atoms, over a wide range of fuel -air mixtures [6] and 75 (ii) chain length and molecular mass by reference to straight chain alkanes in the range C 5 -C 8 76 [7]. 77 Interpretation of the results was linked to the influence of H radicals at the flame front in 78 controlling the burn rate.…”

mentioning

confidence: 99%

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Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities

Burluka

Gaughan

Griffiths

et al. 2017

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21Measurements of the laminar and turbulent burning velocity of premixed hydrogen -air, n-22 hexane -air and n-octane -air flames were made and compared to corresponding measurements 23 of deuterium -air, n-hexane-d14 -air and n-octane-d18 -air flames performed at identical initial 24 conditions. Experiments were conducted in a constant volume, optically accessed vessel, at 25 elevated initial pressure and temperature of 0.5 MPa and 360 K, for a range of equivalence ratios.

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confidence: 82%

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confidence: 88%

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confidence: 90%

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confidence: 95%

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confidence: 99%

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Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities

Burluka

Gaughan

Griffiths

et al. 2017

Fuel

Self Cite

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Experimental study of the combustion characteristics of methanol‐gasoline blends pool fires in a full‐scale tunnel

et al. 2018

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Summary The combustion characteristics of methanol‐gasoline blends pool fires were studied in a series of full‐scale tunnel experiments conducted with different methanol and gasoline blends. The parameters were measured including the mass loss rate, the pool surface temperature, the fire plume centerline temperature, the ceiling temperature, the smoke layer temperature profile, the flame height, and the smoke layer interface height. The gasoline components were analyzed by GC‐MS. The effects of azeotropism on the combustion characteristics of the different blends were discussed. On the basis of the results of the fire plume centerline temperature, the ceiling temperature, and the flame height, it shows that the tunnel fire regime gradually switches from fuel controlled to ventilation controlled with increasing gasoline fractions in the blends. The fire plume can be divided into 3 regions by the fire plume centerline temperature for the different blends. The N‐percentage rule to determine the smoke layer interface height is found to be applicable for tunnel fires with different blends for N = 26.

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Does Density Ratio Significantly Affect Turbulent Flame Speed?

Lipatnikov

Jiang

et al. 2017

Flow Turbulence Combust

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In order to experimentally study whether or not the density ratio σ substantially affects flame displacement speed at low and moderate turbulent intensities, two stoichiometric methane/oxygen/nitrogen mixtures characterized by the same laminar flame speed S L = 0.36 m/s, but substantially different σ were designed using (i) preheating from T u = 298 to 423 K in order to increase S L, but to decrease σ, and (ii) dilution with nitrogen in order to further decrease σ and to reduce S L back to the initial value. As a result, the density ratio was reduced from 7.52 to 4.95. In both reference and preheated/diluted cases, direct images of statistically spherical laminar and turbulent flames that expanded after spark ignition in the center of a large 3D cruciform burner were recorded and processed in order to evaluate the mean flame radius and flame displacement speed with respect to unburned gas. The use of two counter-rotating fans and perforated plates for near-isotropic turbulence generation allowed us to vary the rms turbulent velocity by changing the fan frequency. In this study, was varied from 0.14 to 1.39 m/s. For each set of initial conditions (two different mixture compositions, two different temperatures T u, and six different , five (respectively, three) statistically equivalent runs were performed in turbulent (respectively, laminar) environment. The obtained experimental data do not show any significant effect of the density ratio on S t. Moreover, the flame displacement speeds measured at u′/S L = 0.4 are close to the laminar flame speeds in all investigated cases. These results imply, in particular, a minor effect of the density ratio on flame displacement speed in spark ignition engines and support simulations of the engine combustion using models that (i) do not allow for effects of the density ratio on S t and (ii) have been validated against experimental data obtained under the room conditions, i.e. at higher σ.

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

Cited by 19 publications

References 32 publications

Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities

Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities

Experimental study of the combustion characteristics of methanol‐gasoline blends pool fires in a full‐scale tunnel

Does Density Ratio Significantly Affect Turbulent Flame Speed?

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