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研究了气膜孔附近的粒子运动与沉积特性,重点研究了粒子直径和气膜出流吹风比对粒子运动与沉积特性的影响.基于EI-Batsh粒子沉积模型,考虑了粒子的黏附/反弹和离去机制,编制了相应的粒子沉积计算模块集成在Fluent软件中,并利用相关实验数据对该计算方法进行了验证.结果表明:1,2μm直径粒子沉积率随吹风比增大而增大;3,4μm直径粒子沉积率则随吹风比增大而减小.1μm直径粒子易受气膜出流卵形涡对的卷吸作用而沉积于相邻气膜孔之间区域,当吹风比为2时粒子沉积率比吹风比为0时高约5倍;5μm直径粒子运动轨迹受气膜出流影响较小.总体沉积率随吹风比升高而不断降低,吹风比为2时总体沉积率比吹风比为0时减小1.7%.
The particle movement and deposition characteristics near the film hole were studied, and the effects of particle diameter and outflow blowing ratio on the particle movement and deposition characteristics were studied emphatically. Based on the EI-Batsh particle deposition model, the particle adhesion / And the corresponding particle deposition calculation module is compiled and integrated into the Fluent software.The experimental results show that the deposition rate of 1,2μm diameter particles increases with the blowing ratio increasing.3 , And the deposition rate of 4μm diameter particles decreases with the increase of blowing ratio.The particles with the diameter of 1μm are apt to be entrained by the enthalpy of the outflow ovum vortex in the membrane and deposited in the region between the adjacent membrane pores when the blowing ratio is 2 Particle deposition rate is about 5 times higher than when the blowing ratio is 0, while 5μm diameter particle trajectory is less affected by the outflow of film, the overall deposition rate decreases with increasing blowing ratio, while when the blowing ratio is 2, the overall deposition rate is lower than blowing ratio A decrease of 1.7% at 0.