微米沙尘高温气-粒两相流平板沉积特性研究

Based on the high temperature elastic-plastic collision theory of micron-sized sand dust, the sand dust-wall collision deposition model and the two-phase flow theory, the collision and deposition characteristics at different temperatures were studied for the sand dust of 1 to 5 μm and the nickel-based single crystal wall surface, the air flow characteristics, particle motion trajectories and collision deposition results were analyzed, and the influence of particle size and temperature on the collision rate, deposition rate and capture rate of micron-sized sand dust was studied. The results show that the motion trajectories of micron-sized sand dust at different outlet positions are quite different in the channel transportation process. The collision rate of sand dust with the diameters of 1 to 5 μm decreases with the decrease of particle size when the temperature is 1 323 K. The deposition rate and capture rate are highest for the sand dust of 1 μm, which are 37.86% and 6.049% respectively. The deposition rate and capture rate are much lower for sand dust with the diameter above 2 μm. The deposition rate and capture rate for the sand dust with the diameter of 1 μm increase with the rise of the temperature at 1 273 K, 1 323 K and 1 343 K.