Abstract:Aiming at the problems of high resistance, high energy consumption of traction in subsoiling, low operation efficiency, cultivated layer restoration and soil remediation, an active lubricating drag reduction scheme for curved subsoiler for low water content and high compactness farming soil was proposed. Firstly, on the basis of the three-dimensional model of the curved subsoiler obtained by three-dimensional scanning, the interaction between the subsoiler and the soil particles during the operation of the curved subsoiler was analyzed by the discrete element method, and the maximum friction contact surface of the subsoiler body was determined as the active lubrication drag reducing surface. Secondly, the idea of active lubricating drag reduction was proposed, and the body fluid distribution and body surface texture of earthworm were used for reference. To form the active lubrication and drag reducing curved subsoiler, the surface configuration in the form of groove, the structure of the lubricating surface such as throttle hole and the pumping system of the lubricating medium were designed on the maximum friction contact surface of the subsoiler surface and the subsoiler tip, respectively. Finally, the operation speed and lubricating fluid flow rate were used as the test factors, and the horizontal operation resistance was the main indicator. Field tests were carried out under two soil conditions. The test results showed that in the brown soil environment, when the operating speed was 3km/h and the lubricating fluid flow rate was 12L/min, the drag reduction rate could reach 13.48%. In the saline-alkali environment, when the operating speed was 1.87km/h and the lubricating fluid flow rate was 12L/min, the drag reduction rate could reach 19.87%. It was preliminarily proved that the active lubricating drag reduction operation mode had a good drag reduction effect in the soil with low moisture content and high compactness.