DNS Analysis on the Indirect Relationship between the Local Burning Velocity and the Flame Displacement Speed of Turbulent Premixed Flames

Tsuboi, Kazuya; Tomita, Eiji

doi:10.4236/ojfd.2014.43022

Cited by 1 publication

(1 citation statement)

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“…Note that very low peaks around 0.5 in case Mm and Mh are due to little inaccurate integration nearby the boundary of the computational domain. According to the other work [15], the reason why the profiles and modes of the pdfs were dependent on Lewis number was the deviation of the local chemical reaction rates along normal to the flame surface with the different Lewis numbers. In all Lewis number cases, the pdfs of Range 1 and Range 2 were almost the same profiles.…”

Section: Resultsmentioning

confidence: 89%

Evaluation of the Local Burning Velocity Using DNS Data of Turbulent Premixed Flames

Tsuboi¹,

Matsugi²,

Tomita³

2014

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The local burning velocity, which is based on the consumption rate of the unburned mixture, is one of the dominant parameters in turbulent premixed flames. In this study, the evaluating method of the local burning velocity was investigated using DNS data of turbulent premixed flames with different Lewis numbers. The local burning velocity was evaluated by integrating the chemical reaction rates along normal to the flame surface within three kinds of integration ranges that were defined as follows: the range which is defined by the half length of normal to the flame surface between its certain point and the other point crossing the flame surface (Range 1); the range which is defined by the reaction progress variable that the chemical reaction rate along normal to a planer flame surface takes a half of the maximum value (Range 2); the range which is defined by the length of normal to the flame surface between its certain point and the point which has the extreme value of the reaction progress variable (Range 3). As a result, Range 1 and Range 2 were affected by the flame shapes greatly, since the quantities of the integration ranges fluctuated widely dependent on the variations of turbulent premixed flames. Under the conditions of the turbulent combustion in this study, Range 3, which is hardly affected by a flame shape, is considered to be appropriate to the evaluation of the local burning velocity.

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Section: Resultsmentioning

confidence: 89%