عنوان مقاله [English]
Combustion of a mixture of inhomogeneity reactants is a type of combustion in which the mixing of fuel and air is not complete. This study investigated the numerical effect of the pilot location on the turbulent jet flame lift off height with different levels of inhomogeneity in the combustion chamber. The effect of different equevalence ratios has also been investigated. In this numerical study, the configuration modeling of Navier Stokes equations using Reynolds averaging method, standard k-ε turbulence and reactive flow modeling of Eddy Dissipation Concept (EDC) method have been used. Observations show that the flame lift off height decreases with increasing inhomogeneity length and the flame attach during a certain inhomogeneity length, which depends on the equevalence ratio and pilot location. In all of the cases studied, a range of inhomogeneity lengths was found during which the flame was attached. The results show that the flame lift off height in nonpremixed mode is higher than in the case where the fuel-air mixture ignites almost premixed in the chamber. The higher the equevalence ratio, the lower the flame lift off height. Based on the three locations studied in the side wall for the pilot location and the results obtained, the pilot in the middle area of the side wall had a lower flame lift off height and a higher attached flame range. Also, the flame area inside the chamber changes as the inhomogeneity changes.