This paper presents an experimental study to investigate the effect of burning a mixture of biodiesel/A-1 jet fuel in a combustion chamber on flame characteristics . WCOME was produced from raw waste cooking oil by transesterification process with the help of ultrasonicator to reduce the production time. Swirl burner was used for the formation of central recirculation zone with Swirl number (SN) equal 0.55 , and the flame was stabilized using a swirl burner . Delivery air supplied was preheated to a constant temperature of 250 °C and mixed with prevaporized fuel at equivalence ratio φ of 0.75 for all tested fuel blends. The B5 and B10 mixture (5% and10 vol% biodiesel with Jet A-1) are pre-evaporated and pre-mixed with air before being fed into a cylindrical combustion chamber of inner diameter (D = 150mm) and length (L = 500mm). The temperature of the premixed fuel/air mixture entering the combustion chamber is kept constant at 250 °C with equivalence ratio Ф = 0.75 (lean conditions) for all tested conditions. The effects of excess air (λ = 33%) , equivalence ratio (ϕ=0.75) and , preheated air temperature (T ≥ 250 C°) , prevaporized fuel with fuel nozzle (0.5 gph and 30°) and preheated air swirled are constant for each tests .