Computational flow analysis of carburetor venturi effecting on obstacles

A computational fluid dynamics (CFD) is used to develop a three dimensional, fully turbulent model of the compressible flow across a complex-geometry venturi, such as those typically found in small engine carburetors. An attempt is made in this paper to carry-out three dimensional CFD analysis of effecting on carburetor venturi with obstacles and fuel tube to draw various types’ contours of the static pressure, velocity, total pressure and turbulent kinetic energy. First is to model the carburetor venture using CFD tool and meshed by volume mesh with 84, 605 Tetrahedron elements. Then the CFD analysis is carried–out and presented results, is observed result drawn for various types of static pressure, velocity, total pressure and turbulent kinetic energy is effecting the fuel tube and venturi without obstacles and effecting on modified obstacles, It is observed that the obstacles located at converging nozzle of the venturi do not cause significant pressure losses, while those obstacles wakes on the flow. Significantly, once the mass flow rate is corrected using an overall discharge coefficient, the knowledge of the actual Cross-sectional area at the venturi throat is enough to calculate the static pressure and Stagnation Pressure(total pressure) at the tip of the fuel tube. The evaluated results are validated with mathematical model, its good agreement.