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中文摘要：
浸没式膜生物反应器系统内膜面附近的流场动力学特性对控制膜污染具有重要意义。本文应用粒子图像测速（PIV）技术测试膜面附近的气液两相流动力学特性，在3种不同曝气孔径和6种不同曝气强度条件下，测试得到膜面附近的液相流场数据。结果表明，曝气强度对液相流场影响较大，在一定范围内增加曝气强度可以使得液相速度增加，在本实验条件下，最佳曝气强度确定为5．5m3／h。同时分析了2mm孔径下圆帽状气泡的动力学特性。本文研究结果为膜生物反应器系统的优化设计提供了研究经验和实验数据。
英文摘要：
The dynamic characteristic of flow field around membrane fibers affects directly the membrane pollution problem in submerged membrane bioreactor system. In this article PIV technology was used to test the dynamic characteristic of the gas-liquid two-phase flow around membrane surface. Liquid flow field data was measured around membrane surface at three bore diameters and six different aeration intensity conditions. The results show that aeration intensity affect liquid phase flow field greatly, increasing aeration intensity in a certain range can make the liquid velocity increase. Under the experimental conditions, the optimal aeration intensity identified as 5.5 m3/h. This paper analyzes bubble dynamics characteristics in the 2ram bore diameter. The paper provide experimental data and research experience for optimization design of membrane bio-reactor （MBR）.
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