通过水力跃迁提高曝气效率的溶解氧实验研究

IF 2.3 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation Pub Date : 2024-10-16 DOI:10.1016/j.flowmeasinst.2024.102715

Saikat Mondal , Rajib Das , Subhasish Das , Sanchayan Mukherjee

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引用次数: 0

摘要

水中的溶解氧 (DO) 水平对水质和支持水生生物至关重要。水力跃迁是指水流从超临界状态向亚临界状态的快速变化，在河床坡度突变处可见，如河流或运河的泄洪道基部。与传统系统相比，水力跃迁能有效地将空气中的氧气混合到水中，并通过在水流中夹带气泡来改善氧气的传输，从而提供一种经济有效的曝气方法。这项实验研究的目的是调查水力跃层参数的曝气性能，并建立测量曝气（或传氧）效率的关键相关性。研究确定了传质效率、跃层高度、跃层长度、序深比、排水量、入口弗劳德数和河床坡度之间的关系。为了研究这些关系的性质，在矩形倾斜水槽中进行了一系列实验，以测试五种不同排水量和五种不同光滑河床坡度的强制沉没式水力跃层的曝气性能。跃流前的入口弗劳德数从 2.18 到 8.23 不等。实验观察证实，传质效率与跃层控制参数之间存在正相关关系。在实验过程中，发现转移效率在 9.4 % 到 34 % 之间变化。这项研究包括估算水力跃迁带来的最佳传输效率，这可以帮助水利工程师建造能够振兴任何退化溪流的结构。

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Experimental investigation of dissolved oxygen improving aeration efficiency by hydraulic jumps

The dissolved oxygen (DO) level in water is vital for water quality and supporting aquatic life. Hydraulic jumps involve rapid flow changes from super-critical to sub-critical, visible at abrupt bed slope shifts, like at spillway bases in rivers or canals. The hydraulic jump efficiently mixes oxygen from air into water and offers a cost-effective method of aeration by entraining air bubbles in the stream to improve oxygen transfer compared to traditional systems. The objective of this experimental research is to investigate the aeration performance with hydraulic jump parameters and establish correlations crucial to measuring aeration (or transfer) efficiency. Relationships between transfer efficiency, jump height, jump length, sequent depth ratio, discharge, inlet Froude number, and channel bed slope were determined. To investigate the nature of such relationships, a series of experiments were conducted in a rectangular tilt flume to test the aeration performance of forced submerged hydraulic jumps with five different discharges and five different smooth bed slopes. The inlet Froude number before the jump varied from 2.18 to 8.23. Experimental observation confirms a positive relationship between transfer efficiency and jump control parameters. During experimentation, transfer efficiency was found to vary between 9.4 % and 34 %. This research includes estimating the optimal transfer efficiency due to hydraulic jumps, which can help hydraulic engineers in building structures that can revitalize any degraded stream.

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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.