Comparisons of Spray Characteristics between Non-circular and Circular Nozzles with Rotating Sprinklers

IF 0.8 4区农林科学 Q4 AGRICULTURAL ENGINEERING

Applied Engineering in Agriculture Pub Date : 2022-01-01 DOI:10.13031/aea.14688

Rui Chen, Hong Li, Jian Wang, Xin Guo, Z. Song

{"title":"Comparisons of Spray Characteristics between Non-circular and Circular Nozzles with Rotating Sprinklers","authors":"Rui Chen, Hong Li, Jian Wang, Xin Guo, Z. Song","doi":"10.13031/aea.14688","DOIUrl":null,"url":null,"abstract":"HighlightsExperiments were conducted to investigate the hydraulic performance of the solid-set rotating sprinkler.The effects of nozzle shape and working pressure on the droplet characteristics and kinetic energy of the rotating sprinkler were analyzed.The circular nozzle has a large wetting radius and large droplet size.Use of a non-circular nozzle could result in higher irrigation uniformity and lower kinetic energy imparted to the soil surface by water droplets under low working pressures.Abstract. Reducing the working pressure of sprinklers can effectively reduce sprinkler irrigation energy requirements. However, the reduction in working pressure and variation of nozzle shape inevitably lead to changes in the hydraulic performance of the sprinkler. To evaluate the spray characteristics of selected non-circular (the shape of the nozzle opening was asymmetric) and circular nozzles at low pressure, experiments were conducted to investigate the effects of working pressure, nozzle shape, and nozzle diameter on flow rate, radius of throw, water application rate, droplet size, droplet velocity of the rotating sprinkler, and kinetic energy of the water droplets impacting on the soil surface. The coefficients of irrigation uniformity were calculated for the non-circular and circular nozzles under different rectangular sprinkler spacing and working pressures. The results show that the flow rates of the non-circular and circular nozzles were equal under the same working pressure and with the same nozzle size, while the throw radius of the circular nozzle was longer than that of the non-circular nozzle. The circular nozzle produced a larger droplet size than the non-circular nozzle did. Since the droplet size and kinetic energy per unit droplet volume increased along the radius of throw, and the peak water application rate of the circular nozzle was located near the perimeter of the radius of throw, the peak specific power impact on the soil surface by the water droplets of the circular nozzle was greaterspecifically, 1.26 to 1.97 times that of the non-circular nozzle. With the increase in working pressure, the peak values of specific power and water application rate decreased. The irrigation uniformity coefficients of the non-circular and circular nozzles were more than 85% within the recommended pressure range of the manufacturer when the sprinkler spacing was less than 11 m. It was easier to obtain higher irrigation uniformity and lower impact kinetic energy under low working pressure when using a non-circular nozzle. Keywords: Application rate, Irrigation uniformity, Kinetic energy, Sprinkler irrigation, Working condition.","PeriodicalId":55501,"journal":{"name":"Applied Engineering in Agriculture","volume":"1 1","pages":""},"PeriodicalIF":0.8000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Engineering in Agriculture","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.13031/aea.14688","RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"AGRICULTURAL ENGINEERING","Score":null,"Total":0}

引用次数: 6

Abstract

HighlightsExperiments were conducted to investigate the hydraulic performance of the solid-set rotating sprinkler.The effects of nozzle shape and working pressure on the droplet characteristics and kinetic energy of the rotating sprinkler were analyzed.The circular nozzle has a large wetting radius and large droplet size.Use of a non-circular nozzle could result in higher irrigation uniformity and lower kinetic energy imparted to the soil surface by water droplets under low working pressures.Abstract. Reducing the working pressure of sprinklers can effectively reduce sprinkler irrigation energy requirements. However, the reduction in working pressure and variation of nozzle shape inevitably lead to changes in the hydraulic performance of the sprinkler. To evaluate the spray characteristics of selected non-circular (the shape of the nozzle opening was asymmetric) and circular nozzles at low pressure, experiments were conducted to investigate the effects of working pressure, nozzle shape, and nozzle diameter on flow rate, radius of throw, water application rate, droplet size, droplet velocity of the rotating sprinkler, and kinetic energy of the water droplets impacting on the soil surface. The coefficients of irrigation uniformity were calculated for the non-circular and circular nozzles under different rectangular sprinkler spacing and working pressures. The results show that the flow rates of the non-circular and circular nozzles were equal under the same working pressure and with the same nozzle size, while the throw radius of the circular nozzle was longer than that of the non-circular nozzle. The circular nozzle produced a larger droplet size than the non-circular nozzle did. Since the droplet size and kinetic energy per unit droplet volume increased along the radius of throw, and the peak water application rate of the circular nozzle was located near the perimeter of the radius of throw, the peak specific power impact on the soil surface by the water droplets of the circular nozzle was greaterspecifically, 1.26 to 1.97 times that of the non-circular nozzle. With the increase in working pressure, the peak values of specific power and water application rate decreased. The irrigation uniformity coefficients of the non-circular and circular nozzles were more than 85% within the recommended pressure range of the manufacturer when the sprinkler spacing was less than 11 m. It was easier to obtain higher irrigation uniformity and lower impact kinetic energy under low working pressure when using a non-circular nozzle. Keywords: Application rate, Irrigation uniformity, Kinetic energy, Sprinkler irrigation, Working condition.

查看原文本刊更多论文

旋转喷头非圆形喷嘴与圆形喷嘴的喷雾特性比较

通过实验研究了固置式旋转喷头的水力性能。分析了喷嘴形状和工作压力对旋转喷头液滴特性和动能的影响。圆形喷嘴的润湿半径大，液滴尺寸大。采用非圆形喷头可以获得更高的灌溉均匀性和较低的工作压力下水滴传递给土壤表面的动能。降低洒水器的工作压力，可以有效降低洒水灌溉的能量需求。然而，工作压力的降低和喷头形状的变化必然导致喷头水力性能的变化。为评价所选非圆形(喷嘴开口形状不对称)和圆形喷嘴在低压下的喷雾特性，通过试验研究了工作压力、喷嘴形状和喷嘴直径对旋转喷头的流量、抛射半径、施水量、液滴大小、液滴速度以及水滴撞击土壤表面动能的影响。计算了不同矩形喷头间距和工作压力下非圆形和圆形喷头的灌溉均匀性系数。结果表明:在相同的工作压力和喷嘴尺寸下，非圆形喷嘴和圆形喷嘴的流量相等，但圆形喷嘴的甩射半径大于非圆形喷嘴;圆形喷嘴比非圆形喷嘴产生更大的液滴尺寸。由于液滴大小和单位体积动能沿抛射半径增大，且圆形喷嘴的施水量峰值位于抛射半径周长附近，因此圆形喷嘴水滴对土壤表面冲击的峰值比功率更大，为非圆形喷嘴的1.26 ~ 1.97倍。随着工作压力的增大，峰值比功率和耗水量均呈下降趋势。当喷淋间距小于11 m时，非圆形和圆形喷嘴的灌溉均匀性系数在厂家推荐压力范围内均大于85%。采用非圆形喷嘴时，在较低的工作压力下更容易获得较高的灌溉均匀性和较低的冲击动能。关键词:施用量，灌溉均匀性，动能，喷灌，工况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Applied Engineering in Agriculture 农林科学-农业工程

CiteScore

1.80

自引率

11.10%

发文量

审稿时长

6 months

期刊介绍： This peer-reviewed journal publishes applications of engineering and technology research that address agricultural, food, and biological systems problems. Submissions must include results of practical experiences, tests, or trials presented in a manner and style that will allow easy adaptation by others; results of reviews or studies of installations or applications with substantially new or significant information not readily available in other refereed publications; or a description of successful methods of techniques of education, outreach, or technology transfer.