2015
DOI: 10.1016/j.combustflame.2015.07.045
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Laminar premixed flat non-stretched lean flames of hydrogen in air

Abstract: Laminar burning velocity of lean hydrogen + air flames at standard conditions is still a debated topic in combustion. The existing burning velocity measurements possess a large spread due to the use of different measurement techniques and data processing approaches. The biggest uncertainty factor in these measurements comes from the necessity to perform extrapolation to the flat flame conditions, since all of the previously obtained data were recorded in stretched flames. In the present study, laminar burning … Show more

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Cited by 37 publications
(8 citation statements)
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“…The radial temperature profile was analysed for around 700 measurements to calculate the mean parabolic parameter C. In the present study, the profiles in the near adiabatic area is set to C < −0.1 to prevent any impact caused by the nonlinear behaviour of C. 25 Up to five single points for C were measured for each equivalence ratio, four of them with a negative parabolic parameter and one with a positive, in order to interpolate to the point C = 0. This procedure generates the value of interest: that is,the adiabatic burning velocity.…”
Section: Experimental Methodsmentioning
confidence: 99%
“…The radial temperature profile was analysed for around 700 measurements to calculate the mean parabolic parameter C. In the present study, the profiles in the near adiabatic area is set to C < −0.1 to prevent any impact caused by the nonlinear behaviour of C. 25 Up to five single points for C were measured for each equivalence ratio, four of them with a negative parabolic parameter and one with a positive, in order to interpolate to the point C = 0. This procedure generates the value of interest: that is,the adiabatic burning velocity.…”
Section: Experimental Methodsmentioning
confidence: 99%
“…In addition, an oxidizer flow is also used as a carrier gas to facilitate fuel vaporization. A more detailed description of the method, its experimental setup, and the data processing procedures can be found in ref and references therein, while associated measurements uncertainties are discussed in ref . Typical uncertainties of the S L measurements using the heat flux method were close to ±1 cm/s.…”
Section: Methodsmentioning
confidence: 99%
“…For both test conditions, at some equivalence ratios, adiabatic flames were not accessible because of the appearance of cellular structures during the measurements. For these fuel mixtures, S L was determined using the extrapolation procedure from stable subadiabatic flames, that is, flames with unburned gas velocity lower than S L ; this method is described in the work of Alekseev et al 19 Before and after each experimental session, heat flux setup was thoroughly tested with fuel/ air mixtures, whose S L were widely investigated in the literature (i.e. methanol and ethanol), with the aim of confirming the correctness of the experimental results.…”
Section: Methodsmentioning
confidence: 99%
“…4 presents selected experimental data for lean flames. Only burning velocities derived using non-linear models for stretch correction in spherical and counterflow flames, together with recent measurements in non-stretched flat flames [162] are shown. For lean hydrogen flames the current model coincides with the predictions of the mechanism of Keromnes et al [55].…”
Section: Laminar Premixed Flamesmentioning
confidence: 99%
“…Symbols: experiments, lines: modeling. Experimental: black: Alekseev et al[162]; blue (spherical flame, NLM): Dayma et al[163], Varea et al[164]; orange (counterflow, NLM): Das et al[165,166], Park et al[167]. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.…”
mentioning
confidence: 98%