采用PDA测量竖直向下圆管突扩流动中的气相与颗粒相运动参数,研究了小颗粒(55.2 μm)、低雷诺数(1.98×104)的稀疏流动中湍流变动的规律.结果表明,在主流区和回流区中,颗粒均削弱气相脉动,而在下游则出现增强的现象,这是由于颗粒延缓了突扩流动的发展所致.在入口段的壁面剪切区域,湍流削弱幅度与平均速度梯度呈线性关系;由于壁面的限制,回流区内的剪切作用沿流动方向逐渐增强,使得相应的各横截面内气相脉动的最大值基本保持不变,同时整体脉动程度增强.
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