low-pressure drop size distribution characterization of impact sprinkler jet nozzles with and without aeration

Xiang, Qingjiang; Qureshi, Waqar; Tunio, Mazhar Hussain; Xu, Zhengdian; Lakhiar, Imran Ali

doi:10.1016/j.agwat.2020.106458

Cited by 13 publications

(13 citation statements)

References 36 publications

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“…Furthermore, from the perspective of the entire jet trajectories of low‐pressure sprinklers, the areas near the sprinkler and end of the jet were not good spraying areas due to the substantial proportion of small droplets that easily evaporated. Meanwhile, there were also some large droplets at the end of the jet that could inevitably produce strong kinetic energy (King & Bjorneberg, 2011; Xiang et al, 2021). Thus, the first half of the jet might be a suitable spraying area for crop growth and soil and water conservation.…”

Section: Results and Analysismentioning

confidence: 99%

“…Note: Droplet diameters are divided into six ranges of 0-1, 1-2, 2-3, 3-4, 4-5 and 5-6 mm for statistics droplets that easily evaporated. Meanwhile, there were also some large droplets at the end of the jet that could inevitably produce strong kinetic energy (King & Bjorneberg, 2011;Xiang et al, 2021). Thus, the first half of the jet might be a suitable spraying area for crop growth and soil and water conservation.…”

Section: Radial Droplet Diameter Distributionmentioning

confidence: 99%

“…Sprinkler performance is commonly evaluated by droplet diameter and kinetic energy, which are related to irrigation efficiency, soil conservation and crop growth. (Ge et al, 2020;Xiang et al, 2021). Droplets with small diameters are susceptible to wind drift and evaporation losses and can be significantly affected by wind (Molle et al, 2012;Play an et al, 2005;Sadeghi et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comprehensively evaluating and modelling droplet diameters and kinetic energies of low‐pressure sprinklers

Hui

Zheng

Meng

et al. 2022

Irrigation and Drainage

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Proper droplet diameter and kinetic energy can effectively reduce the risk of soil erosion during low-pressure sprinkler irrigation. In this study, we comprehensively evaluated the radial distributions of droplet diameter, velocity, kinetic energy, kinetic energy per unit droplet volume, and specific power for three common low-pressure sprinklers, i.e. Nelson D3000, R3000 and Komet KPT, with two operating pressures (103 and 138 kPa) and three nozzle outlet diameters (3.97, 5.95 and 7.94 mm). Additionally, the relationships between these droplet characteristic parameters were analysed. Overall, the maximum values of five characteristic parameters were observed at the end of the jet under various treatments. Although R3000 had a larger droplet diameter (0.10-6.42 mm) and kinetic energy (1.08 Â 10 À10 -8.59 Â 10 À3 J) distribution range than D3000 and KPT, the D3000 specific power (mean value of 0.4274 W m À2 ) was the highest of the three sprinklers. Therefore, KPT was suggested more in low-pressure sprinkler irrigation than in the other two sprinklers because its application rates were reduced along the radial direction. In addition to selecting a suitable sprinkler type for minimizing specific power, determining a reasonable sprinkler spacing was also significant (P < 0.01). Furthermore, a universal specific power model with an appropriate accuracy (RMSE = 0.011 W m À2 , NRMSE = 29%) was proposed. This study provides a key basis for the selection and combination of low-pressure sprinklers.droplet diameter, kinetic energy, low-pressure sprinklers, specific power, universal model Résumé Un diamètre de gouttelettes et une énergie cinétique appropriés peuvent réduire efficacement le risque dérosion des sols lors de l'irrigation par aspersion à basse pression. Dans cette étude, nous avons évalué de façon complète les distributions radiales du diamètre des gouttelettes, de la vitesse, de l'énergie cinétique, de l'énergie cinétique par unité de volume des gouttelettes, et de la puissance spécifique pour trois sprinklers courants à basse pression, à savoir Nelson D3000, R3000 et Komet KPT, avec deux pressions de fonctionnement (103 et 138 kPa) et trois diamètres de sortie de la buse (3,97, 5.95 et 7.94 mm). De plus, Article title in French: Evaluation et modélisation complètes des diamètres de gouttelettes et des énergies cinétiques des sprinklers basse pression.

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Section: Results and Analysismentioning

confidence: 99%

Section: Radial Droplet Diameter Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comprehensively evaluating and modelling droplet diameters and kinetic energies of low‐pressure sprinklers

Hui

Zheng

Meng

et al. 2022

Irrigation and Drainage

View full text Add to dashboard Cite

show abstract

“…Herein, the average application depth was 11-35 mm, which was divided into five grades (15,20,25,30, and 35 mm) (deviation, 6 1 mm). Each level of the optimal speed mode, CU value, and speed distribution based on the motion state of the sprinkler on the y-axis is shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…The CU value is a key index 12 for evaluating the hydraulic performance of motion irrigation using irrigation equipment 13 and the combined irrigation of the sprinklers. 14 However, they are affected by working conditions 15 and natural environmental factors, such as temperature and humidity. 16,17 Many researchers have explored the relationship of the working conditions between the CU value and average application depth when there are other irregular factors in the experiment by establishing a calculation model.…”

Section: Introductionmentioning

confidence: 99%

A two-directional calculation model for the combination uniformity coefficient of an impact sprinkler

Xiang

et al. 2022

Advances in Mechanical Engineering

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An impact sprinkler loaded on a remote control trailer can be used for motion to improve the efficiency of a single Hard Hose Traveler in small and medium-sized irregular fields. Herein, a model for calculating the combination uniformity coefficient (CU) was established in the square test area under two-directional motion. The accuracy of the irrigation uniformity model was verified using the test data of application depth ( hn). The results revealed that the nozzle diameter, speed of sprinkler motion ( v), and motion methods can significantly impact the average application depth ([Formula: see text]) and the CU value of sprinkler irrigation performance. The motion methods included uniform motion and a constant speed combination motion. The highest CU values were recorded when the primary and secondary nozzle diameters were 10.5 and 4.5 mm, respectively (overall value, about 81.7%). The CU value gradually decreased with the increasing v value of the sprinkler. The CU value was higher under the constant speed combination motion than the uniform motion. The [Formula: see text] value gradually decreased with increasing v value. The [Formula: see text] value was classified based on the water requirement of different crops. The optimal CU value corresponding to each grade of the [Formula: see text] value was obtained in different schemes of the combination of sprinkler speeds. This research guides the realization of variable spraying of a Hard Hose Traveler and the intelligent uniform motion of the sprinklers.

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Hydraulic performance of the rotational damping sprinkler: Analysis of the force acting on diffuser tooth I

Pan

Jiang

et al. 2023

Irrigation and Drainage

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Improving water distribution uniformity is crucial for the development of high‐performance irrigation sprinklers, and the diffuser's tooth length greatly influences water distribution. Five diffusers with varying tooth I lengths were designed and researched. The expressions for the force acting on tooth I, the hydraulic performance of the sprinkler and the combination uniformity were obtained analytically and experimentally. The results showed that the tooth I force is affected by the working pressure, the ratio between the plate outlet area and the riser pipe flow area, tooth width, entry water depth, trajectory angle and tooth I slope surface angle. Moreover, the components of the tooth I force acting in the vertical, radial and circumferential directions increase with the tooth I length and working pressure. The necessary condition for normal diffuser operation is that the force in the aforementioned three directions should be greater than 0.37, 0.57 and 0.28 N, respectively. Furthermore, when the working pressure is increased by 50 kPa, hereby reducing the rotation time by 10 min and the tooth I length by 1 mm, its water distribution and combination uniformity are optimal. This study provides a basis for designing and operating diffusers and improving sprinkler hydraulic performance.

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low-pressure drop size distribution characterization of impact sprinkler jet nozzles with and without aeration

Cited by 13 publications

References 36 publications

Comprehensively evaluating and modelling droplet diameters and kinetic energies of low‐pressure sprinklers

Comprehensively evaluating and modelling droplet diameters and kinetic energies of low‐pressure sprinklers

A two-directional calculation model for the combination uniformity coefficient of an impact sprinkler

Hydraulic performance of the rotational damping sprinkler: Analysis of the force acting on diffuser tooth I

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