折线型实用堰流量系数试验研究
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摘要
折线实用堰作为低堰,因其结构简单,施工方便,在中小型水利工程和农业工程中应用广泛,但对其泄流能力的研究尚不够充分,因此有必要对折线实用堰过流能力影响因素进行试验研究。根据经验从堰型设计入手,运用水力学相关知识,分别对矩形实用堰和梯形实用堰堰流进行试验研究。通过分析水流流速、上游堰高、堰坎厚度、上下游堰坡、堰型和堰后出流对堰流流量系数的影响及其流量系数变化规律。得出结论:堰坎厚度、上下游堰坡、堰型、堰后出流是堰流流量系数的主要影响因素,影响其泄流能力。结果可为低坝等工程设计提供参考。
As a low Weir, the broken line practical Weir is widely used in small and medium water conservancy projects and agricultural projects because of its simple structure and convenient construction, but the research on its discharge capacity is not enough. Therefore, it is necessary to study the influence factors on the overcurrent capacity of practical broken line Weir. Based on the experience of Weir design, the flow of rectangular and trapezoidal Weir is studied by using the knowledge of hydraulics. The influence of flow velocity, upstream Weir height, Weir dam thickness, upstream and downstream Weir slope, Weir type and post-Weir discharge on Weir flow coefficient and its variation law are analyzed. It is concluded that the thickness of Weir sill, upstream and downstream Weir slope, Weir type and post-Weir discharge are the main influencing factors of Weir discharge coefficient, which affect the discharge capacity of Weir. The results can provide reference for low dam engineering design.
As a low Weir, the broken line practical Weir is widely used in small and medium water conservancy projects and agricultural projects because of its simple structure and convenient construction, but the research on its discharge capacity is not enough. Therefore, it is necessary to study the influence factors on the overcurrent capacity of practical broken line Weir. Based on the experience of Weir design, the flow of rectangular and trapezoidal Weir is studied by using the knowledge of hydraulics. The influence of flow velocity, upstream Weir height, Weir dam thickness, upstream and downstream Weir slope, Weir type and post-Weir discharge on Weir flow coefficient and its variation law are analyzed. It is concluded that the thickness of Weir sill, upstream and downstream Weir slope, Weir type and post-Weir discharge are the main influencing factors of Weir discharge coefficient, which affect the discharge capacity of Weir. The results can provide reference for low dam engineering design.
引文