STUDY OF SPRAY FLOW CALCULATION METHODS - COMPARISON BETWEEN LAGRANGIAN AND EULERIAN METHODS

In this study the flow patterns of a two-phase (air-particle) swirling or non-swirling jet in the cylindrical duct were calculated by the La grangian and Eulerian methods. The calculated results were compared wi th experimental data measured by LDV. In conclusion, (1) the flow char acteristics of the larger particle-laden jet were predicted successful ly by the Lagrangian method, while the Eulerian method performed bette r for the smaller particle-laden jet; (2) the Eulerian method was apt to overpredict the particle axial velocity near the centerline of the jets and it was considered that the overprediction was caused by overp redicted value of the volume fractions of particle near the centerline . We also studied the computational (CPU) time to obtain the converged results and the stability of calculation. The Eulerian method needed less CPU time than the Lagrangian method in calculating the smaller pa rticle-laden jet. When the larger particle-laden jet or swirling two-p hase jet were calculated by the Eulerian method, the stability of calc ulation became worse, and thus the CPU time increased greatly.