Flow Field Analysis of a Carburettor Using CFD

The objective of present study is to predict and analyze the flow through the Carburettor for two different throttle opening conditions. The studies have been carried out by Computational Fluid Dynamics (CFD) software and the prediction has been validated with experimental data. Three dimensional geometrical models of two different throttle positions namely 50% opening and wide open throttle (100% throttle opening) were created using the commercially available software. The mesh was generated using the Tet-hybrid scheme which includes primarily of tetrahedral mesh elements but may also include hexahedral, pyramidal and wedge elements. The pressure boundary conditions are used to define the fluid pressure at the inlet and outlet of the carburettor. The steady state flow field analysis inside a carburettor has been simulated using the Multiphase mixture model and Langrangian Discrete phase model.

The CFD plots give informative pictures of the flow field, which will help the designer to understand the effect of various components of carburettor. The predicted air and fuel flow rate shows good agreement with the experimental results. The result obtained from the present study indicate that the model can be used as a tool to understand the effect of various parts of carburettor for optimization and to reduce the number of experiments.