In this study, the effects of the number of swirler blades, swirler blade wrape angle, swirler blade length and the fuel inlet diameter on the turbulent flow structure, combustion efficiency and emission in a combustion chamber have been investigated. The number of blades (n), the blade length (L), the blade wrape angle (θ) and the fuel inlet diameter (D2) of the swirler blades were taken as 10, 40 mm, 45° and 19.5 mm, respectively. New models were created using the parameters of the blade number (6,8,10,12,14), the blade length (0.5L, L, 1.5L, 2L), the blade wrape angle (30°, 45°, 60°, 75°, 90°, 120°) and the fuel inlet diameter (0.5 D2, D2, 1.5 D2, 2 D2). Numerical analysis were performed using ANSYS/Fluent 17.2 commercial software and non-premixed combustion model was defined according to the referenced experimental study. Numerical method was validated with the comparison of numerical and experimental data. It is concluded that the wrape angle has a significant effect on the flame shape and the blade length on the symmetrical structure of the flame. The highest thermal efficiency was obtained for the model M04510403900 (θ =45°, n=10, L =40 mm, D2=39.00 mm) and the thermal efficiency of the referenced swirler geometry of 79.3% were increased to 93.8% with this model. It has been seen that CO mass fraction value upstream of the dilution holes was 0.002 for referenced swirler model and this value increased to 0.018 for the model M04510400975 (θ=45°, n=10, L=40 mm, D2=9.75 mm).