Flow regime discrimination and methodology for calculating discharge in trapezoidal sluice gates

IF 2.3 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation Pub Date : 2024-10-10 DOI:10.1016/j.flowmeasinst.2024.102710

Wanshang Meng , Lin Li , Shuaijie Zhao , Pengcheng Li

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引用次数: 0

Abstract

This study introduces a novel trapezoidal sluice gate designed for water division and flow control within irrigation networks featuring canals with trapezoidal cross-sections. Experiments were conducted on trapezoidal channels with side slopes of m = 1.5, 1.75, and 2.0, using trapezoidal sluice gates at various gate openings, upstream water depths, and downstream depths. A total of 411 experimental sets were conducted to study methodologies for discerning between free flow and submerged flow conditions and for determining discharge rates. A method was proposed to distinguish flow patterns of trapezoidal sluice gates: submerged flow occurs when the downstream channel depth (h_t) exceeds the submergence threshold (H_t'), while free flow is indicated when h_t is less than H_t'. The formula for calculating H_t' was derived, along with formulas for computing discharge rates under free flow and submerged flow conditions for trapezoidal sluice gates. The results revealed that the average relative errors of the formulas obtained through the partition method and the submergence coefficient correction method were 2.24 % and 5.37 %, respectively, demonstrating high accuracy and reliability. The scale effects on the flow regimes and formulas of discharge rates are also discussed. Findings from this study enhance the understanding of the hydraulic characteristics of trapezoidal sluice gates, which hold significant implications for the adoption and intelligent management of such gates in irrigation areas, offering a viable solution for selecting appropriate water gate configurations in irrigation systems.

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梯形水闸的水流状态判别和排水量计算方法

本研究介绍了一种新型梯形水闸，设计用于以梯形横截面渠道为特色的灌溉网络中的分水和流量控制。实验在边坡为 m = 1.5、1.75 和 2.0 的梯形渠道上进行，使用不同闸门开度、上游水深和下游水深的梯形水闸。共进行了 411 组实验，以研究区分自由流和潜流条件以及确定排水率的方法。提出了一种区分梯形水闸水流模式的方法：当下游河道水深（ht）超过淹没临界值（Ht'）时为淹没水流，而当 ht 小于 Ht' 时为自由水流。推导出了 Ht' 的计算公式，以及梯形水闸在自由流和淹没流条件下的排水率计算公式。结果表明，通过分区法和淹没系数修正法得到的公式的平均相对误差分别为 2.24 % 和 5.37 %，显示了较高的准确性和可靠性。此外，还讨论了尺度对水流状态和排泄率公式的影响。本研究的结果加深了人们对梯形水闸水力特性的理解，对灌区采用和智能管理此类水闸具有重要意义，为灌溉系统中选择合适的水闸配置提供了可行的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Flow Measurement and Instrumentation 工程技术-工程：机械

CiteScore

4.30

自引率

13.60%

发文量

123

审稿时长

6 months

期刊介绍： Flow Measurement and Instrumentation is dedicated to disseminating the latest research results on all aspects of flow measurement, in both closed conduits and open channels. The design of flow measurement systems involves a wide variety of multidisciplinary activities including modelling the flow sensor, the fluid flow and the sensor/fluid interactions through the use of computation techniques; the development of advanced transducer systems and their associated signal processing and the laboratory and field assessment of the overall system under ideal and disturbed conditions. FMI is the essential forum for critical information exchange, and contributions are particularly encouraged in the following areas of interest: Modelling: the application of mathematical and computational modelling to the interaction of fluid dynamics with flowmeters, including flowmeter behaviour, improved flowmeter design and installation problems. Application of CAD/CAE techniques to flowmeter modelling are eligible. Design and development: the detailed design of the flowmeter head and/or signal processing aspects of novel flowmeters. Emphasis is given to papers identifying new sensor configurations, multisensor flow measurement systems, non-intrusive flow metering techniques and the application of microelectronic techniques in smart or intelligent systems. Calibration techniques: including descriptions of new or existing calibration facilities and techniques, calibration data from different flowmeter types, and calibration intercomparison data from different laboratories. Installation effect data: dealing with the effects of non-ideal flow conditions on flowmeters. Papers combining a theoretical understanding of flowmeter behaviour with experimental work are particularly welcome.