曝气转盘作用下的氧化沟流场特性

Characteristics of flow fields in oxidation ditches under action of aeration turntables

采用声学多普勒测速仪(ADV)在1号、2号曝气转盘同时运行时测量氧化沟模型内流速场,通过对流速场测量数据的拟合分析,得到氧化沟第2直道内曝气转盘上游、下游流速沿程变化的数学表达式.研究结果表明:曝气转盘上游、下游流速沿垂线分布、横向分布、内外分区界限及沿程变化规律均不同,曝气转盘上游水力特性与典型明渠中弯道出流相似,曝气转盘下游水力特性与典型明渠明显不同.

The acoustic Doppler velocimeter（ADV） was employed to measure the velocity fields in the model for oxidation ditches under the simultaneous running of aeration turntables No.1 and No.2.By fitting the measured data,a mathematical expression for the distribution laws of upstream and downstream velocities of the aeration turntables in the straight way No.2 of the oxidation ditches was acquired.The results show that the variation laws of upstream and downstream velocities of the aeration turntables along the vertical and lateral directions,the district boundaries and the flows are different.The hydraulic characteristics in the upstream of the aeration turntables are similar to those of discharge flows in typically curved bend in open channels.While the hydraulic characteristics in the downstream of the aeration turntables are significantly different from those in typical open channels.