Numerical and experimental analysis of a gasoline fuel spray

The fully Lagrangian approach to the calculation of the number density of inertial particles in dilute gas-particle flowsis implemented into the CFD code ANSYS Fluent via User Defined Functions (UDF). The functionality testing of thenew version of this code is performed for a gas-particle flow around an infinite circular cylinder. In a steady-statecase, the results predicted using both Eulerian and the fully Lagrangian methods are almost identical for low inertiaparticles at small Reynolds numbers (based on the cylinder diameter) (Re = 1, Stk = 0:05). For larger values ofthese numbers (Re = 10, 100; Stk = 0:1, 0:2) the fully Lagrangian approach predicts higher values of the gradientsof particle number densities in front of the cylinder compared with the ones predicted by the Eulerian approach. Fortransient flows (Re = 200), both methods predict high values of the number densities between the regions of highvorticity and very low values in the vortex cores. For Stk 0:1 the maximal values predicted by the fully Lagrangianapproach are shown to be several orders of magnitude higher than those predicted by the Eulerian approach. Thefully Lagrangian method, implemented into ANSYS Fluent, has been applied to calculate the number densitiesof droplets in direct injection gasoline fuel spray. Preliminary results show good qualitative agreement betweennumerical simulation and experimental observations.