Structures and performances of laminar impinging multiple premixed LPG-air flames

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Author list: Makmool U., Jugjai S., Tia S.

Publisher: Elsevier

Publication year: 2013

Journal: Fuel: The Science and Technology of Fuel and Energy (0016-2361)

Volume number: 112

Start page: 254

End page: 262

Number of pages: 9

ISSN: 0016-2361

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879071051&doi=10.1016%2fj.fuel.2013.05.028&partnerID=40&md5=0edc33e001654a6f1c2f2b65f6acc9f4

Languages: English-Great Britain (EN-GB)

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Abstract

Three different imaging techniques were utilized to study the laminar, impinging, multiple, premixed liquefied petroleum gas (LPG)-air flames for simulating the premixed impinging flames of practical cooking burners. Two line-of-sight observation techniques are introduced, i.e. direct photography of a typical visible flame and the imaging of flame chemiluminescence, whereas the spatially resolved imaging is carried out by means of the OH-PLIF technique as the in situ visualization. Effects of the key parameters of heating height (H/D) and inter-port spacing (S/Do) on the flame structure and flame interaction are systematically studied and compared. The burner's performances in terms of CO emissions and thermal efficiency are experimentally studied to correlate with the flame structure. Among the three techniques, the OH-PLIF measurement is the most reliable technique to uncover the combustion situation existing in the flames. H/D is a major parameter controlling the multiple flame structure and the corresponding burner's performance, whereas S/Do has a less degree effect as compared with H/D. The optimum condition is found at H/D = 2.1 and S/Do = 1.5, where OH-PLIF profiles are well correlated with the corresponding burner's performance. This study results in better understanding of insights into the structure of the multiple premixed impinging flames, which is valuable for further work of designing an efficient, practical cooking burner. ฉ 2013 Elsevier Ltd. All rights reserved.

Keywords

Flame interaction, Flame structure, Impinging premixed flame, OH PLIF