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文章主要研究氧化沟直段水力特性,并与典型明渠理论对比。采用声学多普勒测速仪(ADV)测量氧化沟模型内流速场,通过对测量数据的拟合分析,得到氧化沟直段流速沿垂向分布、横向分布及沿程变化规律,对水流的流速分布进行对比分析,提出有关氧化沟流场的理论成果(内区流速分布符合对数分布。外区流速分布开始偏离对数分布而趋于二次抛物线分布,用二次抛物线分布能较好地拟合实际分布规律,对内、外分区界限的变化规律进行拟合分析,得到分区界限距渠底的相对高度的统一表达式),与典型明渠理论进行对比,得出氧化沟流场分布及沿程变化与典型明渠明显不同。氧化沟内垂线流速分布存在明显的分区结构,内区流速分布规律与典型明渠中相似,外区流速分布规律与典型明渠中差别很大。
The paper mainly studies the hydraulic characteristics of straight section of oxidation ditch and compares it with the typical open channel theory. Acoustic Doppler velocimeter (ADV) was used to measure the velocity field in the oxidation ditch model. Through the fitting analysis of the measured data, the flow velocity in the straight section of the oxidation ditch along the vertical distribution, lateral distribution and variation along the path was obtained. The theoretical results of the oxidation ditch flow field are proposed (the flow velocity distribution in the inner region accords with the logarithmic distribution, the flow velocity distribution in the outer region begins to deviate from the logarithmic distribution and tends to be a quadratic parabola distribution, Fitting the actual distribution law and fitting the analysis of the variation rule of the inner and outer zoning boundaries and obtaining the uniform expression of the relative height between the zoning boundaries and the bottom of the canal), comparing with the typical open channel theory, The changes along the way are obviously different from the typical open channels. The vertical distribution of velocities in the oxidation ditch has obvious zoning structure. The velocity distribution in the inner zone is similar to that in a typical open channel. The distribution of velocity in the outer zone is quite different from that in a typical open channel.