Kai Gao
ABSTRACT
In order to analyze the influence of the structural parameters of the water jet system of the lotus root digger on harvesting efficiency, this paper determines the main factors affecting the harvesting performance based on the principle of a "submerged" water jet for the nozzle outlet shape, outlet area, jet direction, and target distance. Using CFD simulation, it simulates the effect of the velocity distribution, jet impact force, and jet distribution on the harvesting development of the two-nozzle water jet hitting the water layer under different jet angles and target distances. The influence of the jet distribution on the harvesting effect when the water jet hits the water layer at different spray angles and target distances was simulated under different nozzle structure parameters. The results show that the performance of a round outlet nozzle is better than that of an oval, rectangular, and square outlet, and when the outlet size is set at 15∼16mm and the jet velocity is about 20m/s, the scouring effect is better and it can ensure that the couplings are not broken; when double nozzles are used, with the spray angle of 20∼30° and the target distance of 200mm, the effective scouring area of the jet is more extensive and the scouring effect is better.
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