Theoretical Foundations of Water-Conducting Belt Design for Wide Coverage Sprinklers Using Numerical Simulation

Abstract

Improvement of wide-coverage sprinkler technical level requires provision of high irrigation productivity and quality with the minimum cost of construction, rational use of water and energy. It is necessary to maintain the required flow-pressure characteristics regardless of sprinkler external operating conditions and the length of the water supply belt. The article discusses the possibility of mathematical modeling application for a wide sprinkler design. The studies showed that during the calculation it is possible to get by with the finite equations without resorting to the differential equations of fluid motion theory with variable mass. The obtained dependences served as the basis for the development of water-conducting belt calculation methods for a wide-sprinkler. A numerical simulation of the water supply belt operation of the KASKAD sprinkler is presented with standard values for the pipeline diameters and the variable length of the sprinkler. Numerically obtained graphs of the flow rate and the required pressure dependences on water supply belt length for two design options: with a sector end sprinkler and an end longrange sprinkler operating from a booster pump. By eliminating the length of the water supply belt for the considered two design options, they designed the flow-discharge characteristics of the sprinkler. They presented an example of a constructive solution selection for the water-conducting belt of a sprinkler according to flow-pressure characteristics.

Technological solutions are environmentally friendly safe watering with wide-ranging sprinkler machines

“…The optimal value of the norm for watering, depending on the total number of sectors and the sector number, is determined from the expression [9,[11][12][13]:…”

Technical and technological Solutions for environmentally safe Irrigation with wide-reach Sprinklers

“…It was found that with a specific precipitation power of 0.002-0.056 W per 1 m 2 , soil erosion is not observed, and with an increase in this indicator from 0.056 to 0.12 W/m 2 , destruction and water erosion of the soil are insignificant [10].…”

“…Studies of scientists [1][2][3][4][5][6][7][8][9][10] have established that the average intensity of rain at the beginning of the DM "Frigate" varies from 0.05 to 0.10 mm/min and reaches 0.45 mm/min at the end of the car when calm and increases to 0.6...0.8 mm/min with wind. The average actual rain intensity varies along the pipeline from 1.5 to 2.6 mm/min.…”

“…Thus, rain with a specific energy not exceeding 0.12 W per 1 m 2 will be optimal for sprinkler machines, from the point of view of erosive action [10].…”

The influence of spatial heterogeneity of the properties of agricultural fields on productivity

“…The simplified approach was primarily due to the lack of technical and technological capabilities, appropriate digital technologies, and sensor systems. Nevertheless, modern domestic and foreign researchers have proven the relatively low effectiveness of this approach [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”