Analysis of the Influence of the Channel Layout and Size on the Hydraulic Performance of Emitters

Du, Peisen; Li, Zhiqin; Wang, Cuncai; Ma, Junsheng

doi:10.3390/agriculture12040541

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…We analyzed the simulation results of the emitter flow field under each structural parameter in the range of 5 to 15 mH 2 O inlet pressure, calculated the flow coefficient k and flow state index x, and fitted to obtain the pressure-flow relationship curve. The pressure-flow relationship curve slope for each emitter at different working pressures was calculated according to [44]:…”

Section: Results and Analysismentioning

confidence: 99%

Hydraulic Performance and Energy Dissipation Mechanism Analysis of the Tesla-Shaped Emitter

Hao

et al. 2023

Energies

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In this paper, a tesla-shaped emitter is proposed based on the structure of the “tesla valve” as the source of inspiration, so that the water flow in the channel would produce a variety of energy dissipation phenomena, such as diversion, hedging, and mixing, to explore the hydraulic performance and energy dissipation mechanism of the tesla-shaped emitter. The channel structure parameters were taken as factors, and 16 groups of orthogonal tests were arranged. Based on CFD technology, the pressure–flow relationship curve slope, flow ratio between the main channel and secondary channel, flow field, and head loss of the emitter were calculated and analyzed for different combinations of structural parameters. Based on a significance level α = 0.05 test, the main channel inlet section length (L3) had a significant impact on the curve slope, and the secondary channel length (L1) and main channel inlet section length (L3) had a significant impact on the flow. The multiple linear regression mathematical models between the channel structure parameters and the curve slope and the flow were constructed. The larger the ratio between the main channel and the secondary channel flow, the better the hydraulic performance of the emitter. The channel unit loss coefficient increased linearly with the increase of the emitter inlet pressure, and its value ranged from 4.5769 to 8.1716, with an excellent energy dissipation effect. The hedge mixing of the water flow was the core of the energy dissipation of the tesla-shaped emitter. By appropriately increasing the inlet size of the main channel and other elements to increase the main channel flow and optimize the flow ratio between the main channel and the secondary channel, the mixing was improved, which consequently improved the hydraulic performance of the emitter.

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Section: Results and Analysismentioning

confidence: 99%

Hydraulic Performance and Energy Dissipation Mechanism Analysis of the Tesla-Shaped Emitter

Hao

et al. 2023

Energies

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“…Clogging primarily occurs in the emitters of subsurface drip irrigation systems and is caused by particle blockage, deposition from chemical reactions between fertilizers, and the aggregation of microorganisms in confined spaces [74]. Regular flushing or periodic flushing can effectively prevent clogging in pipelines and emitters [75]. The anticlogging performance of emitters depends on factors such as channel shape, dimensions, materials, and other factors.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Hotspots in Subsurface Drip Irrigation Research Using CiteSpace

et al. 2023

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To investigate the research hotspots and development trends of subsurface drip irrigation (SDI) over the past 20 years, this study analyzed relevant literature from the Web of Science Core Collection spanning from 2002 to 2022. The data were visualized using CiteSpace, showcasing the publication volume trends, countries, keywords, cited references, authors, and affiliated institutions. Based on 1079 articles, the annual publication volume showed an overall upward trend. The United States had the most extensive research coverage and highest publication volume, whereas China had the fastest growing publication rate in recent years. However, relatively little cooperation occurred among research teams and institutions. Over time, research topics became increasingly diverse, with water conservation and yield increases being the primary research objectives. In addition to improving irrigation and fertilizer use efficiency, SDI has also been applied in research on the safe utilization of unconventional water resources (wastewater and salt water) and the optimization of soil conditions. Among these, aerated irrigation technology—aimed at improving root growth in the rhizosphere—may become a new branch of SDI research. Currently, the main research focus in the field of SDI is the diffusion and distribution of water in the crop root zone, for which Hydrus model simulation is a particularly important method.

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“…Celik et al [14] conducted experimental and CFD analysis of the flow characteristics of labyrinth-channel emitters and found that the channel's corner structure could improve the hydraulic performance of the emitter. Du et al [15] found that changing the flow path of the emitter from one inlet and one outlet to one inlet and two outlets resulted in better hydraulic performance. Patil et al [16] studied labyrinth emitters with five different tooth shapes and found that the tooth structure has a greater effect on the vortex in the flow field, and pointed out that a reasonable boundary structure can increase the energy dissipation in the channel.…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis of the Influence of Structural Parameters on the Hydraulic Performance of the Novel Y-Shaped Emitter

et al. 2023

Agriculture

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As a key component of a drip irrigation system, the performance of drip irrigation emitters is determined by the flow channel structures and parameters. In this paper, a novel Y-shaped labyrinth-channel emitter was proposed, and the influence of the hydraulic performance was researched under different waist-arc angles (α) and ratios of crown height to chord length (a:b). The flow characteristics and energy dissipation mechanisms of water in the emitter were analyzed by using fluid dynamics software. The analysis showed that, keeping the ratio of crown height to chord length unchanged and with an increase in the waist-arc angle from 90° to 180°, the pressure-drop ratio before and after the water flow through the vortex area increased, and the hydraulic performance of the emitter was improved, specifically: the design flow could be reduced by 6.02–26.7%, and the slope of the curve could be reduced by 9.83–28.1%. The smaller the ratio of crown height to chord length, the weaker the influence of waist-arc angle was on the design flow and hydraulic performance. Keeping the waist-arc angle unchanged, there was a decrease in the ratio of crown height to chord length from 6:30 to 1:30, the vortex strength inside the emitter channel increased, and the hydraulic performance was improved: the design flow could be reduced by 7.56–23.5%, and the slope of the curve could be reduced by 5.43–20.5%. The bigger the waist-arc angle, the weaker the influence of the ratio of crown height to chord length was on the design flow and the hydraulic performance, even to the point of having no effect. When the Y-shaped emitter was close to the pressure-flow curve slope of the commonly-used triangular-channel emitter, the hydraulic performance of the two was similar, and the former could increase the channel width by 25%, as compared to the latter, or shorten the channel length by 44.3%. The results showed that the Y-shaped emitter had better hydraulic performance compared with the triangular-flow-channel emitter commonly used today. Therefore, the Y-shaped emitter has broad application prospects in water-saving irrigation.

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Analysis of the Influence of the Channel Layout and Size on the Hydraulic Performance of Emitters

Cited by 4 publications

References 14 publications

Hydraulic Performance and Energy Dissipation Mechanism Analysis of the Tesla-Shaped Emitter

Hydraulic Performance and Energy Dissipation Mechanism Analysis of the Tesla-Shaped Emitter

Analysis of Hotspots in Subsurface Drip Irrigation Research Using CiteSpace

Mechanism Analysis of the Influence of Structural Parameters on the Hydraulic Performance of the Novel Y-Shaped Emitter

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