Influence of a Fixed Water Dispersion Device on Jet Dispersion and Range From an Impact Sprinkler

Li, Hong; Issaka, Zakaria; Jiang, Yue; Tang, Pan; Chao, Chen

doi:10.1002/ird.2352

Cited by 13 publications

(8 citation statements)

References 26 publications

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“…The nozzle elevation angle is an important structural parameter of the nozzle, as discussed in Section 3.2. The nozzle spray range increases with the nozzle diameter and nozzle working pressure, which is consistent with the conclusions in previous research (Li et al, 2019). However, the degree of influence of the nozzle elevation angle on the spray range is asymmetrically distributed over the interval of variation.…”

Section: Resultssupporting

confidence: 92%

Modelling the spray range of rotating nozzles based on modified ballistic trajectory equation parameters

Zhang

Liu

Zhu

et al. 2023

Irrigation and Drainage

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The nozzle spray range is an important parameter in the design of sprinkler systems because it affects the wetted area and water application rate. In this study, the jet deformation parameter kjet, which can measure the mass and shape of the jet microelement, was investigated, and a spray range prediction model for a rotating nozzle was established based on the modified ballistic trajectory equation. A comparison verified the accuracy of the model, and the degree of influence of different factors on the spray range was analysed. The results showed the following: (1) The dimension of the jet deformation parameter kjet is the length L, which is a function of the nozzle diameter, working pressure and nozzle elevation angle. (2) The maximum mean absolute error and root mean square error of the current model at a nozzle elevation angle of 24° were 2.038 and 1.603, respectively, representing a maximum increase in prediction accuracy of 87% and 86.7%, respectively, over other models at the same angle. (3) A sensitivity analysis revealed that the factor with the greatest impact on the nozzle spray range was the nozzle diameter, and the smallest was the nozzle mounting height. (4) The maximum nozzle spray range was positively related to the nozzle diameter and working pressure, and the nozzle elevation angle varied at approximately 30° when the maximum range was reached. This study provides a reference for the design of sprinkler systems and the development of rotating nozzles.

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Section: Resultssupporting

confidence: 92%

Modelling the spray range of rotating nozzles based on modified ballistic trajectory equation parameters

Zhang

Liu

Zhu

et al. 2023

Irrigation and Drainage

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“…When the operating pressure is greater than 150 kPa and h = 1 mm, the jet's atomization degree increases gradually with the spray distance, which will help the sprinkler achieve an even spray with only a slight loss of sprinkler pattern radius. These findings are consistent with those reports by Issaka (2019); Issaka et al (2020); and Li et al (2019), where the effect of a water dispersion device on sprinkler irrigation performance was investigated. They obtained the optimal insertion depth of the water dispersion device, which allowed not only the operating pressure of the sprinkler head to be reduced but also the uniformity of the water distribution to be improved on the premise of a small sprinkler pattern radius reduction.…”

Section: Discussionsupporting

confidence: 93%

“…The influence of different NSWDD shapes on the breakup of the impinging jet under low pressure was studied by Issaka (2019), and a water entry depth of 4.5 mm was found to yield the optimal sprinkler hydraulic performance. An experimental study was carried out by Li et al (2019) on the water entry depth and jet diffusion angle of the NSWDD under low pressure using high‐speed photography, and the conclusion was reached that the jet diffusion angle increases with increasing water entry depth. The effect of an impact sprinkler and rotary damping sprinkler on impact jet breakup was studied by Issaka et al (2020) under low pressure, and the jet atomization range of the impact sprinkler was found to be much more extensive than that of the rotary damp sprinkler when an NSWDD was used.…”

Section: Introductionmentioning

confidence: 99%

Effects of the depth of the needle‐shaped water dispersion device inserted into the jet on the jet breakup of sprinklers

Pan

Jiang

2023

Irrigation and Drainage

Self Cite

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Needle‐shaped water dispersion devices (NSWDDs) can break the jet and make the sprinkler spray evenly even under low working pressure. However, an inappropriate selection of the depth at which the NSWDD is inserted into the jet will affect the sprinkler pattern radius. To study the effect of the NSWDD insertion depth on the jet breakup, the jet structure, atomization, vorticity, static pressure and velocity distribution are studied using a combination of the lattice Boltzmann method and high‐speed photography. The results show that as the insertion depth increases, the jet structures gradually evolve from liquid films to ligaments, causing the diffusion angle of the jet to increase. Under the same operating pressure, the degree of jet atomization increases with increasing insertion depth. Meanwhile, the velocity pulsation degree on the central axis gradually increases, which will cause the jet to have a shorter air travelling distance. As the insertion depth and the radial position distance from the nozzle outlet increase, the velocity on the radial line first exhibits a symmetrical distribution, then an asymmetric one and finally a symmetric one again. The results can fill the gap in previous research on the effects of the NSWDD on jet breakup.

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“…Up till now, with the rapid development of computational fluid mechanics (CFD) [15][16][17][18][19][20], many researches about the pressure pulsation and TLF have been carried out simultaneously, but those kinds of literature mostly focus on the flow structure of TLF and tip leakage vortex and there are few reports about the relationship between TLF and pressure pulsation. For instance, Liu et al [21][22][23] conducted numerical simulations for a mixed-flow pump with different tip clearances using a commercial CFD code to study the tip leakage vortex structure and trajectory.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Pressure Pulsation in a Mixed-Flow Pump with Different Tip Clearances Based on Wavelet Analysis

Shi

et al. 2020

Shock and Vibration

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In order to investigate the effect of various impeller tip clearances on the pressure pulsation in a mixed-flow pump, the energy performance test and pressure pulsation experiment of a mixed-flow pump with different tip clearances are studied simultaneously. The pressure pulsation signals at impeller inlet, middle, and oulet are processed and analyzed by the wavelet transform. The results show that the change of tip clearance can affect the head and efficiency of mixed-flow pump. Under designed flow rate, when the tip clearance increases from 0.2 mm to 1.1 mm, the head and efficiency decrease by 18.1% and 11.6%, respectively. Due to the strong influence of blade passing frequency (BPF) at impeller middle, the period of pressure pulsation curve is about 1/4 of impeller rotation period. At impeller inlet, the low-frequency pulsation with energy concentration is the main disturbance frequency, and, with the increase of tip clearance, not only does the high-value region of wavelet spectrum expand to low-frequency direction but also it is easy to form second-order peaks in the time-averaged wavelet curve. At impeller outlet, affected by BPF and rotor-stator interaction (RSI), the high-frequency disturbance in RSI area decreases first and then increases. The wavelet coherence demonstrates the stable low-frequency disturbances in comparison to others and it will affect the flow field at impeller middle.

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Influence of a Fixed Water Dispersion Device on Jet Dispersion and Range From an Impact Sprinkler

Cited by 13 publications

References 26 publications

Modelling the spray range of rotating nozzles based on modified ballistic trajectory equation parameters

Modelling the spray range of rotating nozzles based on modified ballistic trajectory equation parameters

Effects of the depth of the needle‐shaped water dispersion device inserted into the jet on the jet breakup of sprinklers

Experimental Study of Pressure Pulsation in a Mixed-Flow Pump with Different Tip Clearances Based on Wavelet Analysis

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