THERMAL SCIENCE

International Scientific Journal

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Zabihollah Najafian Ashrafi

,

Mehdi Ashjaee

EXPERIMENTAL STUDY OF A LAMINAR PREMIXED LFG/AIR FLAME IN A SLOT BURNER USING MACH-ZEHNDER INTERFEROMETRY

ABSTRACT
An experimental study was conducted to investigate the influence of Reynolds number and equivalence ratio on flame temperature field and thermal flame height of laminar premixed LFG fuel. Mach-Zehnder interferometry technique is used to obtain an insight to the overall temperature field. The slot burner with large aspect ratio (L/W), length of L=60 mm and width of W=6 mm was used to eliminate the three- dimensional effect of temperature field. Two kinds of mixed fuels, LFG70 (70%CH4- 30%CO2 on volume basis) and LFG50 (50%CH4- 50%CO2) were used to investigate flame characteristics under the test conditions of 100 ≤ Re ≤ 600 and 0.7 ≤ φ ≤ 1.3. The present measurement reveals that the variation of maximum flame temperature with increment of Reynolds number is mainly due to heat transfer effects and is negligible. On the other hand, the equivalence ratio and fuel composition have a noticeable effect on flame temperature. In addition, the results show that the LFG flames compared to the CH4 ones have a lower flame temperature. With increment of CO2 volume fraction at lean combustion, thermal flame height is augmented while at stoichiometric and rich combustion, its value reduced. Thermal flame height augments linearly by Reynolds number increase, while its increment at rich mixture is higher and the effect of Reynolds number at lean mixtures is insignificant. For validation of experimental results from Mach-Zehnder Interferometry, K-type thermocouples are used at peripherally low and moderate isotherm lines.
KEYWORDS
temperature profile, laminar flame, premixed LFG/air, slot burner, Mach-Zehnder interferometer
PAPER SUBMITTED: 2014-11-13
PAPER REVISED: 2014-11-20
PAPER ACCEPTED: 2014-12-21
PUBLISHED ONLINE: 2014-12-28
DOI REFERENCE: https://doi.org/10.2298/TSCI141113147N
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Issue 5, PAGES [1649 - 1660]
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Experimental study of a laminar premixed LFG/air flame in a slot burner using Mach-Zehnder interferometry

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