When irrigating, sprinklers are important equipment. The quality of the nozzle directly affects the quality of the project. For a good sprinkler, it requires not only good mechanical performance (simple layout, reliable operation), but also good hydraulic performance, that is, it can meet the main technical requirements of sprinkler irrigation (the combined sprinkler irrigation intensity is less than the soil’s allowable sprinkler irrigation intensity, and the diameter of the water droplets is small. The impact of water droplets on soil and crops is small, and the sprinkler combination will distribute the water evenly in the future), and it is the most energy-saving. These requirements are often contradictory or mutually restrictive, so before we choose sprinklers, we should deeply understand the relationship and influencing factors between various hydraulic parameters, so as to choose sprinklers reasonably and make them better meet the production needs.
The primary hydraulic parameters of the rotary sprinkler are: operating pressure, spray volume, range, water distribution pattern, sprinkler intensity and droplet impact strength (or droplet diameter or atomization target).
Generally speaking, we expect the starting pressure and the maximum pressure range of the nozzle to be as wide as possible to adapt to different conditions. Under the same working pressure, the flow rate of the nozzle should be larger, which means that the water head loss in the nozzle needs to be as small as possible, that is, the flow channel in the nozzle should be lubricated and smooth. In fact, the nozzle flow is usually determined by actual measurement. Under the same conditions, the larger the required range, the better, in order to reduce system investment. Secondly, once the nozzle is selected, its parameters can also be directly checked by the relevant product samples. When choosing a sprinkler, you should first consider whether the hydraulic function of the sprinkler can be adapted to the irrigation crops and soil conditions, that is to say, the amount of sprinkler irrigation required to reach the goal of the primary technical factor. In addition, the requirements of combined sprinkler irrigation intensity and uniformity are not only related to the type of sprinklers, but also closely related to the combination method of sprinklers and the combined I coral distance. Therefore, the determination of the three must be carried out simultaneously.