THE EFFECT OF INLET ASPECT RATIO (RIA) TO THE THREE DIMENSIONAL MIXING CHARACTERISTICS IN TANGENTIAL BURNER (TURNITIN)

Pasymi, pasymi (2024) THE EFFECT OF INLET ASPECT RATIO (RIA) TO THE THREE DIMENSIONAL MIXING CHARACTERISTICS IN TANGENTIAL BURNER (TURNITIN). Universitas Bung Hatta.

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Abstract

The degree of mixing is one of the main indicators of the combustion performance in a combustion chamber. The higher the degree of mixing, the more intensive the contact/reaction between the air and the fuel, so that the combustion performance is getting better. The degree of mixing in a combustion chamber is indicated quantitatively by several variables such as the velocity profiles, the flow structure and the turbulence intensity. The degree of mixing in a combustion chamber is influenced by the factors of geometries and operating conditions. This study is aimed to determine the effect of the inlet aspect ratio (RIA) to the mixing characteristics in a tangential burner. The investigation methodology used in this study is based on the numerical simulation with the Ansys-Fluent simulation code as a Computational Fluid Dynamics (CFD) engine. The fluid flow modelings are performed with the standard k-Ephsilon turbulent model. From the simulations that at mesh interval size smaller than 7 % of the chamber diameter, the standard k-Ephsilon model is able to match satisfactorily the tendency of the experimental velocity profiles available in the literature. The simulation results also show that the inlet aspect ratio has a significant influence to the mixing characteristics in the tangential burner. Within the RIA value that is tested, the best mixing characteristic is found on the burner with the RIA value of 10. The formation of the tornado tail flow structure is determined by the inlet aspect ratio, the total mass flow rate and the swirl number.

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