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THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer
July, 10-13, 2018, Rio de Janeiro, Brazil

DOI: 10.1615/THMT-18


ISBN Print: 978-1-56700-468-7

ISBN Online: 978-1-56700-467-0

ISSN Print: 2377-2816

Investigation of reaction zone structure of lean methane−air turbulent premixed flames with OH−CH2O PLIF

pages 227-238
DOI: 10.1615/THMT-18.180
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ABSTRAKT

Simultaneous measurement of planar laser induced fluorescence (PLIF) for OH radical and formaldehyde (CH2O) were performed for methane−air laminar and turbulent premixed flames propagating in a constant volume vessel to investigate effects of Lewis and Karlovitz numbers (Le and Ka) on the relations between the OH, CH2O and the flame front curvature. The turbulent flames of the different were classified into the corrugated flamelets and thin reaction zone regimes in the turbulent combustion diagram. For = 1.0, which is Le = 1, the magnitude of the product of OH and CH2O is close to the corresponding laminar unstretched flame, and the product increases with the increase of flame front curvature, which is defined to be positive for convex towards the burnt side. For the lower Le cases, which are the lower cases, it is revealed that the opposite tendency can be observed.

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