The Influence of Supersonic Separator’s Divergent Angle on Spontaneous Condensation and Separation Performance of Two-Phase Flow

摘要

Based on the secondary development of ANSYS Fluent, the author’s built a gas-liquid two-phase model with spontaneous condensation process. With this model, the author has studied the influence pattern of the influence of supersonic separator’s divergent angle on spontaneouscondensation. Also, by adopting the macros in Fluent UDF, the author’s calculated the mass of produced liquid water per unit time of the whole separator and each stage respectively including nucleation stage, droplets growth stage and stabilization stage to compare and analyze the influenceof the supersonic separator’s divergent angle on the separation performance. The numerical results show that within 0.6°~4.2°, when divergent angle increases, the region of spontaneous condensation shortens and is closer to the throat of the nozzle; the maximum value of nucleationratio increase and the 3-D profile of nucleation ratio changes. Besides, the increase of the divergent angle will result in the shortening of the droplets growth region which will cause the decrease of the outlet droplet radius. At last, the separation performance improves when the divergentangle increases but the improvement ratio decreases.