Large Eddy Simulation of Dilute Spray Dispersion and Evaporation in Different Co-flow Temperatures

摘要

By combining Large Eddy Simulation (LES) model and Discrete Phase Model (DPM), the study investigates turbulent dispersion and evaporation of non-reacting dilute sprays. The results of computation are in conformity with measurements. Comparing two cases in different co-flow temperatures (313K and 433K), the study finds: Both gas and droplet axial mean velocities at central axial positions rise remarkably with the increase of the co-flow temperature. The Stokes number shows little difference in two co-flow temperatures. Dynamically steady state exists during the evaporation period, and the higher the co-flow temperature is, the less time it takes to reach the state. The droplet distribution space decreases and the n-heptane vapor concentration gradient becomes higher when the co-flow temperature increases.