Zhuk Volodymyr, Matlai Ivan, Zavoiko Bohdan, Popadiuk Ihor, Pavlyshyn Vitaliy, Mysak Ihor, Mysak Pavlo
Institute of Civil Engineering and Building Systems, Lviv Polytechnic National University, 12, S. Bandery Str., Lviv 79013, Ukraine E-mail:
Institute of Civil Engineering and Building Systems, Lviv Polytechnic National University, 12, S. Bandery Str., Lviv 79013, Ukraine.
Water Sci Technol. 2023 Aug;88(3):738-750. doi: 10.2166/wst.2023.234.
The accurate assessment of discharge coefficients for different types of water inlets is crucial for minimizing modelling errors in drainage systems thus reducing the risk of flooding in adjacent areas. This study experimentally investigated the hydraulic characteristics of gully grate inlets with water seal and horizontal outflow, with nominal outlet pipe diameters of 100 and 150 mm, using a laboratory setup that meets the requirements of a special European regulation. Transition depths from the weir to the orifice mode were determined, and it was found that the perforated grates significantly increased the hydraulic resistance compared to the bar grates, resulting in a corresponding decrease in the discharge capacity of gully inlets. Power-law relationships between the weir discharge coefficient and gauge head were obtained for both bar and perforated grate inlets, as well as between the discharge coefficient and Froude number at the perimeter of grate inlets. These findings provide important insights for optimizing the design and performance of water inlets, particularly in the weir mode, which is critical for the proper functioning of drainage systems.
准确评估不同类型进水口的流量系数对于最大限度地减少排水系统中的建模误差从而降低相邻区域洪水风险至关重要。本研究使用符合欧洲一项特殊法规要求的实验室装置，对具有水封和水平流出的雨水蓖进水口的水力特性进行了实验研究，其标称出口管径为100毫米和150毫米。确定了从堰流模式到孔口模式的过渡深度，结果发现与棒条式格栅相比，多孔格栅显著增加了水力阻力，导致雨水蓖进水口的排水能力相应降低。获得了棒条式和多孔格栅进水口的堰流流量系数与测压水头之间的幂律关系，以及格栅进水口周边的流量系数与弗劳德数之间的幂律关系。这些发现为优化进水口的设计和性能提供了重要见解，特别是在堰流模式下，这对排水系统的正常运行至关重要。
