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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

Experimental study of a laminar premixed LFG/air flame in a slot burner using Mach-Zehnder interferometry