全文总字数：13326字

摘要根部施药流场模拟

随着林业生产规模的发展，病虫害对树木产生巨大影响，其中根部病虫害具有寄主广泛、扩展迅速、症状隐蔽等特点，危害严重，世界范围内因林木根部病虫害造成的每年经济损失高达数千亿，研究树木根部病虫害防治对发展经济林产业、提高作业效率有重要的意义。目前根部病虫害防治的装置主要将药物喷施在土壤表面，不仅无法满足根部病虫害防治作业的需求，而且极易导致土壤施肥过量、环境污染等众多生态问题。由于技术及装备的匮乏，无法开展田间根部施药试验和应用研究，因此急需研究针对树木根部的技术和装备。本文介绍了国内外根部防治技术和装备，针对根部病虫防治的问题，设计了一种具有强度高、可多介质施放、控制出药量的根部施药装置，通过理论分析、计算机仿真分析等方法，利用流体力学软件FLUENT对根部施药流场进行模拟，研究在土壤介质中不同药液流量、不同流体物性参数以及工具入土深度等工况下药液的扩散情况，不断优化结构，达到更好的施药效果，以满足根部病虫害防治需求，提高林业生产经济效益和生态效益。

关键词：根部病虫害，流场模拟，Fluent

Root application flow field simulation

Abstract

With the development of forestry production scale, pests and diseases have had a huge impact on trees. Among them, root pests and diseases have the characteristics of extensive hosts, rapid expansion, and hidden symptoms, which are serious. The annual economic loss caused by forest root pests and diseases is as high as hundreds of billions worldwide. Research The prevention and control of tree root diseases and insect pests is of great significance to the development of the economic forest industry and the improvement of operation efficiency. The current root disease and insect control devices mainly spray drugs on the soil surface, which not only cannot meet the needs of root disease and insect control operations, but also easily leads to many ecological problems such as excessive fertilization of the soil and environmental pollution. Due to the lack of technology and equipment, it is impossible to carry out field root application experiment and application research, so there is an urgent need to study the technology and equipment for tree roots. This article introduces root control technology and equipment at home and abroad. Aiming at the problem of root disease and pest control, a root application device with high strength, multi-medium application, and control of the amount of medicine is designed. Through theoretical analysis, computer simulation analysis and other methods, the use of fluid the mechanics software FLUENT simulates the flow field of the root application, and studies the diffusion of the chemical solution under different chemical liquid flow rates, different fluid physical parameters and tool penetration depth in the soil medium, and continuously optimizes the structure to achieve better application. The effect is to meet the needs of root pest control and improve the economic and ecological benefits of forestry production.

Keywords: Root pests and diseases, flow field simulation, FLUENT

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