Abstract
In order to characterize water distribution with medium-sized sprinklers a number of single leg tests were conducted in no-wind conditions. The influence of sprinkler type, size and number of nozzles, jet-straightening vane (VP), working pressure, riser height and the irrigation spacing were analyzed in these tests. In a large number of main nozzles, the effect of internal “turbulence” was found when the sprinkler operated at high pressure, implying an important depletion of both discharge and throw. This phenomenon only depends upon the internal design of the main nozzle when no manufacturing defects are present. When calculating the discharge-pressure fit equation in the case of circular nozzles, the mean discharge coefficient ranged from 0.96 to 1.00. The discharge coefficient was independent of the working pressure. In radial indoor tests, higher irrigation uniformity was achieved when the sprinkler operated with double nozzle than with a single nozzle. Whether the sprinkler incorporated a jet-straightening vane within the main nozzle or was located at 2 m aboveground, farther throw was also attained. With VP, CU values decreased; whereas, at 2 m aboveground the uniformity was similar or slightly higher. These results are complemented with those achieved in a set of single sprinkler tests in windy conditions, which are shown in the accompanying article.
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