文献类型： 会议论文

第一作者： Abdellah El Aissaoui

作者： Abdellah El Aissaoui ¹ ; Frederic Lebeau ² ; Marie-France Destain ³ ; Karim Houmy ⁴ ;

作者机构： 1.National Institute of Agricultural Research, Dryland Research Center, PO Box 589 Settat 26000, Morocco

2.Gembloux Agricultural University, Mechanics and Construction Unit, 2 passage de Deportes, Gembloux 5030, Belgium

3.Gembloux Agricultural University,Mechanics and Construction Unit, 2 passage de Deportes, Gembloux 5030, Belgium

4.Agronomic and Veterinary Hassan II Institute, PO Box 6202, Rabat-Institutes, Morocco

关键词： Direct injection;control volume method;lags transport;friction losses;viscosity

会议名称： World Congress on Computers in Agriculture and Natural Resources

主办单位：

页码： 190-198

摘要： Assessment of injection lag transport and uniformity of direct injection boom sprayer is an important issue for successful variable rate spraying technology. To estimate the boom lag transport and pressure loss, a numerical model is formulated on thebasis of fluid hydrodynamic conservation equations. The software is implemented in visual basic. To solve the pressure - velocities equations, control volume finite element method (CV) is used to delimit elementary volumes of the boom. Linearization of the conservation laws is ensured by considering discrete form of the equations and calculating velocity and pressure step by step throughout the whole boom. The flow behaviour is simulated into a boom section divided into N elementary volumes, each of them including one nozzle.To test the model, three boom diameters (5, 6 and 8 mm) and two chemical viscosities (10~(-6) and 10~(-5) m~2/s) were used. Experimental trials are carried out on boom having 2.5 m length (5 nozzles) for measuring pressure gradient and lag transport. Results showed that the model can predict the pressure losses and the lag transport accurately (error within 5%) to optimize boom designs.

分类号： S126-532