The demand for industrial burners and gas turbine engines with reduced emission levels, stable combustion conditions and low specific fuel consumption is the goal at the past two decades. A significant challenge is to develop a practical dual fuel corresponded with these requirements in the way to produce an efficient combustion and to comply with environmental concerns and government regulations.

The investigated burner consists of eight gaseous jets arranged in two consecutively interacted equal lotus bundles in the axial direction downstream of the flow. These eight jets can be easily moved and directed to penetrate the combustion reaction zone at different axial positions with four inclination angles at the burner axis (θ= 0°, 30°, 45°, and 60°). This axial motion is easily performed by adjusting few screws mounted on the burner end in the way to facilitate the jet interaction inside the surrounded combustion air.

The present work aims to demonstrate the flame structure, inflame temperature, and stack emissions at different liquid fuel ratio, gaseous fuel injection locations and jet inclination angles. It is noticed that, the two different fuels at different interaction locations have an influence on the pollutant emissions and temperature as well as the combustion efficiency. In addition, increasing the gaseous fuel reduces the flame size and increases the flame temperature.

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