TY - JOUR N2 - In this study, the turbulent non-premixed methane-air flame is simulated to determine the effect of air velocity on the length of flame, temperature distribution and mole fraction of species. The computational fluid dynamics (CFD) technique is used to perform this simulation. To solve the turbulence flow, k-ε model is used. In contrast to the previous works, in this study, in each one of simulations the properties of materials are taken variable and then the results are compared. The results show that at a certain flow rate of fuel, by increasing the air velocity, similar to when the properties are constant, the width of the flame becomes thinner and the maximum temperature is higher; the penetration of oxygen into the fuel as well as fuel consumption is also increased. It is noteworthy that most of the pollutants produced are NOx, which are strongly temperature dependent. The amount of these pollutants rises when the temperature is increased. As a solution, decreasing the air velocity can decrease the amount of these pollutants. Finally, comparing the result of this study and the other work, which considers constant properties, shows that the variable properties assumption leads to obtaining more exact solution but the trends of both results are similar. L1 - http://www.czasopisma.pan.pl/Content/104269/PDF/ame-2016-0020.pdf L2 - http://www.czasopisma.pan.pl/Content/104269 PY - 2016 IS - No 3 EP - 366 DO - 10.1515/meceng-2016-0020 KW - turbulent flame KW - methane-air KW - non-premixed KW - length of flame KW - flame temperature A1 - Namazian, Zafar A1 - Hashemi, Heidar A1 - Namazian, Farideh PB - Polish Academy of Sciences, Committee on Machine Building VL - vol. 63 DA - 2016.09.18 T1 - Investigation on effect of air velocity in turbulent non-premixed flames SP - 355 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/104269 T2 - Archive of Mechanical Engineering ER -