TY - JOUR
TI - Experimental study of a laminar premixed LFG/air flame in a slot burner using Mach-Zehnder interferometry
AU - Ashrafi Zabihollah Najafian
AU - Ashjaee Mehdi
JN - Thermal Science
PY - 2016
VL - 20
IS - 5
SP - 1649
EP - 1660
PT - Article
AB - 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.