Measurement of Quenching Distance by a Burner

Saika, Takashi; Korematsu, Koji; Takahashi, Sanyo

doi:10.1299/jsme1958.29.3810

Cited by 1 publication

(4 citation statements)

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“…For all the X H2 cases, the D m exhibits a nonmonotonic variation with equivalence ratio in that it first decreases, reaching a minimum value and then starts to increase again when the reactants become progressively richer. This equivalence ratio dependence of D m is similar to that of quenching distance value as reported by Saika et al and Lavoie et al Furthermore, the critical equivalence ratio at which minimum D m occurs is dependent on X H2 . For instance, D m reachs its minimum value at Φ of 1.0 for the X H2 = 0 cases (i.e., neat methane/air flame) but shifts to Φ of around 1.1 for hydrogen-enriched flames.…”

Section: Resultssupporting

confidence: 88%

“…More importantly, D m could well reproduce the relationship between quenching distances and equivalence ratios, rendering the current study of additional practical importance. Note in Figure a that, even under the same condition, the measured quenching value may vary among different experimental campaigns. , In fact, such discrepancies are not uncommon due to the rather small value of quenching distance which requires high experimental accuracy such that the differences between their absolute values are deemed acceptable.…”

Section: Resultsmentioning

confidence: 98%

“…engines. Available experimental quenching distance was frequently obtained by measuring the minimum gap between two parallel plates that a flame can propagate without extinction. , The calculated D m are not expected to be directly compared with such two-plate quenching distance data due to the different physical processes. Fortunately, researchers have shown that they are indeed correlated after some numerical manipulation.…”

Section: Resultsmentioning

confidence: 99%

“…Note in Figure 4a that, even under the same condition, the measured quenching value may vary among different experimental campaigns. 36,44 In fact, such discrepancies are not uncommon due to the rather small value of quenching distance which requires high experimental accuracy such that the differences between their absolute values are deemed acceptable.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Hydrogen Addition on the Standoff Distance of Premixed Burner-Stabilized Flames of Various Hydrocarbon Fuels

Yan

Wang

2018

Energy Fuels

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The quenching distance of premixed hydrocarbon flames is of significant importance for studying flame/wall interactions and for understanding the unburned hydrocarbon emissions of internal combustion engines. Motivated by the fact that the standoff distance of premixed burner-stabilized flames could be used to investigate the behavior of head-on quenching distance of freely propagating flames despite the different physics involved, a parametric investigation on the standoff distances of methane, ethane, and propane burner-stabilized flames was conducted numerically using a detailed chemical kinetic mechanism, with a focus on the effects of hydrogen addition. Specifically, the minimum standoff distance was found to quantitatively correlate with the head-on quenching distance of premixed flames. The variations of the minimum standoff distance as a function of hydrogen fractions were then investigated in detail. The results showed that as hydrogen fraction increased, the minimum standoff distances decreased monotonously for all the hydrocarbon/air flames, with the reduction being most significant for methane fuel. Accompanying kinetic analysis showed that hydrogen addition enhances the heat release process, which promotes the reduction of minimum standoff distance. Subsequently, the dependences of the minimum standoff distance on fuel dilution, equivalence ratios, unburned gas temperatures, and pressures were explored. In addition, the potential to study the parametric dependence on unburned hydrocarbons emissions induced by near-wall flame quenching using the burner-stabilized flame model was discussed. The current study provides a useful approach to quantify the quenching distance of premixed flames, which has practical applications in internal combustion engines. Moreover, the dependence of standoff distance on hydrogen addition and other varying flame parameters can now be more fundamentally understood with the help of detailed chemical kinetics.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 98%