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考虑挑坎坡度、挑坎高度等9项可能影响掺气坎空腔特性的参数,按照正交设计进行数值模拟试验。在试验基础上,采用极差和方差分析手段,以掺气空腔的外空腔长度、内空腔长度、通气孔进气情况和槽口出流速度为评价指标,对影响掺气坎空腔特性的9个参数进行分析。结果表明:影响掺气坎外空腔长度的诸多因素中,缓坡平台长度是主要因素,其他因素的影响相对较小;U型槽高度对掺气空腔内空腔长度起控制性作用,其他因素影响很小;对于通气孔进气情况和槽口出流速度,9个因素的影响都相对较小。与试验建议方案比较结果表明,通过正交设计分析所选出的最优方案,其水力特性指标均优于其他方案。说明正交设计分析方法是合理的,可行的。所得成果为工程实际中掺气坎体型的设计提供了依据,对于设计行之有效的掺气设施有实际意义。
Considering the parameters such as the slope of slope and the height of the pick ridge, which may affect the cavity characteristics of aeration tank, the numerical simulation experiments were carried out according to the orthogonal design. Based on the experiment, using the range and variance analysis methods, taking the length of the outer cavity, the length of the inner cavity, the condition of the air inlet and the velocity of the outflow of the slot as evaluation indices, The nine parameters of the cavity characteristics were analyzed. The results show that among the many factors that affect the length of the outer cavity, the length of gentle slope platform is the main factor and the influence of other factors is relatively small. The height of U-shaped channel plays a controlling role in the cavity length in aerated cavity. The influence of the factors is very small; for the aeration of the air vent and the outflow velocity of the notch, the influence of the 9 factors is relatively small. Compared with the proposed test program, the results show that the hydraulic characteristics of the optimal project selected by orthogonal design are superior to other schemes. Orthogonal design analysis method is reasonable and feasible. The results obtained provide the basis for the design of aerated ridges in engineering practice and have practical significance for designing effective aerated facilities.