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

Abstract

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.

Structural design and performance characteristics of the fluidic sprinkler application technology for saving irrigation water: a review

“…The afore- mentioned parameters used by previous authors were relatively smaller and could not generate enough pressure to rotate the sprinkler efficiently. Other studies further worked on the design parameters, such as the shape, size, and angle of signal air hole, to improve the working performance of fluidic sprinkler (Wang et al, 2012;Liu et al, 2013;Chen et al, 2022;Xu et al, 2022). Table 1 presents nozzle sizes and corresponding pressures of different sizes of the fluidic sprinkler.…”