风送式超低量喷雾装置内流场数值模拟研究/The numerical simulation study of the inner flow in the air-

2018-12-25 18:37:58

flow 流场 inner low 喷雾



低容量喷雾和风送远射程喷雾技术是近年来世界植保机械领域研究的新技术。其独特的优点是省工、省药、费用低,对农药的剂型、气象条件要求不严格等。但我国在此领域与发达国家还有很大差距,主要体现在施药工效低和农药有效利用率低等。因此积极开展我国施药器械和施药技术的基础理论研究,尽快提高我国农药使用技术水平便成为当务之急。
CFD ( Computational Fluid Dynamics)技术发展到今天,已逐渐作为一种新手段而日益受到重视并得以广泛地应用和发展,并在诸如航空航天等高科技领域中得到了众多工程实践的证实。CFD技术对这些领域中流动、传热、燃烧、化学反应、多相流等问题的高精度数值预测使其在越来越多的工程中得到推广和应用。
本文基于6WC-30Y-G型车载式超低容量喷雾机的喷雾装置,结合喷雾装置流场区域内流场的湍流特性,建立合适的湍流模型。基于CFD通用软件FLUENT,确定了一套喷雾装置内流场的数值模拟方法。
首先,从理论上分析雾滴破碎的机理,找出影响雾滴尺寸和均匀性的主要因素。
其次,针对喷雾装置内流场的流动情况,建立合适的湍流模型,并寻找合理的数值求解算法。结合喷雾区域流场的流动状态对喷雾装置内流场数值模拟的过程及关键问题进行了阐述。
第三,利用FLUENT软件对喷雾装置内流场进行模拟分析。通过对起涡器和喷筒选取不同的参数,分别进行模拟分析,比较模拟结果找到最优的起涡器参数,给喷雾装置的设计提供理论依据。



Ultra-low vloume spraying and long-range air-assisted spraying are the new technologices arisen recently in the field of plant protection equipment. Its special merits: saving labor and drug, low cost, timely preventing and curing, and being not strict to the sorts of drug and weather condition etc, which have made these new technologies walk in the first rank in the field of plant protection equipment. But our country trailed the developed country in the field, about the lower efficiency of crop-dusting and utilize. So developing plant protection equipment actively and studying crop-dusting technology are urgent affairs.
Since CFD (Computational Fluid Dynamics) Technology was invented, it has been attached great importance as a new technique and has been greatly developed. Due to being proved true by the high precise numerical forecasts of flow, heat transference, combustion, chemical reaction, multiphase flow in many engineering practices in high technology industry such as aviation spaceflight etc, the numerical simulation increasingly becomes popularized and adopted in many other engineering industries.
The paper based on the 6WC-30Y-G model truck-mounted ultra-low vloume sprayer and united the turbulent speciality of inner flow field in the area of spraying field, establish the right turbulent model and numerical simulation method based the CFD commercial software FLUENT.
Firstly, the paper analyse the theory of fogdrop fragmentation and find the primary factors about affecting fogdrop sizes and uniformity.
Secondly, establish the right turbulent model and find logical numerically solving arithmetic aimed at the inner flow. Integrating the flow condition in the spraying inner flow field, expound the numerical simulation process and key problems.
The third, use the FLUENT software simulate the inner flow of the air-assisted hydraulic ultra-low vloume sprayer device. Through selecting the different parameter of the seirl lamina and nozzle, simulate the inner flow, and find the best parameter campared to each other. So the results provide the academic gist for the application of the air-assisted hydraulic ultra-low vloume sprayer device.