Abstract:Both dynamic water pressure spraying and intermittent spraying based on pulse width modulation have significant regulating effects on the hydraulic characteristics of sprinkler spraying. In order to give full play to the technical advantages of dynamic water pressure and intermittent spraying, dynamic water pressure and intermittent pulse spraying synchronously were realized through compressed air energy storage regulation. Based on this, a dynamic water pressure intermittent pulse spraying device was developed. The hydraulic performance indexes of sprinkler irrigation under the condition of dynamic water pressure intermittent pulse spraying were measured and calculated. The results showed that under the dynamic water pressure intermittent pulse spraying mode, the working pressure of the sprinkler head presented a threestage change trend of “rapid rise—fluctuation decrease—rapid decline”, and the flow rate of the sprinkler head was decreased by 70.23%~82.77% compared with that of constant pressure continuous spraying. The radial irrigation intensity showed a bimodal distribution, and the peak intensity was about 12.7%~33% of that under continuous spraying. Compared with continuous spraying, the distribution uniformity of spraying water was slightly decreased (5.8%~14.1%), and can be further improved by optimizing the operating parameters. The impact intensity of water droplets on the surface soil was decreased significantly, and the peak kinetic energy intensity was decreased by 50.6%~70.9%. The results showed that the dynamic water pressure intermittent pulse spraying can flexibly improve the hydraulic performance index and had great application potential.