Spray simulation method based on cloud simulation of droplets

Abstract

The invention discloses a spray simulation method based on cloud simulation of droplets. The spray simulation method includes the steps: adopting a three-dimensional stereo camera to acquire three-dimensional point cloud data of plant bodies, and simulating actual crop plants through a point cloud deleting method and coordinate transformation processing; describing spray droplet particle motion trajectories through Lagrangian trajectory description operators under the conditions of determining nozzle type, nozzle coordinates and spray technology parameters; designing a point cloud intersection algorithm of the spray droplet particle motion trajectories and the plants and judging whether the droplets drop on the plant bodies or not and calculating drop point positions thereof; according to requirements of spray operation speed, constantly changing the space coordinates of a nozzle to complete dynamic simulation till a stop condition is reached, outputting droplet deposition rate, and optimizing spraying height. By the spray simulation method, visual operation indexes of spray operation can be analyzed, and the optimal spraying operation height is achieved by taking the effective deposition rate of the droplets as an objective function, so that certain reference is offered to reduce application amount of pesticides during an actual plant protection process.

Description

technical field [0001] The invention relates to a spray method, in particular to a spray simulation method based on fog droplet cloud simulation. Background technique [0002] In order to ensure stable and increased grain production, farmers often use rough plant protection spraying methods in the field, so that a large amount of chemical agents cannot be accurately applied to crop targets, and excessive chemical agents cause serious environmental and food safety problems. [0003] He Xiongkui of China Agricultural University and others have done a lot of research on the issue of "determining the influence of spray technical parameters on spray effect" in the laboratory environment. The experiments have proved the influence of spray technical parameters of fan nozzles on spray effect, especially for fog The drift resistance of the droplet has a significant effect. [0004] The large-scale industry software Ansys Fluent includes a particle simulation system. Scholars at home...

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Problems solved by technology

[0004] The large-scale industry software Ansys Fluent includes a particle simulation system. Scholars at home and abroad use this software to simulate droplets to assist in the design of sprayers. Applications are often limited

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