Simulation and optimum design of small fan for animal house by CFD

In order to improve the aerodynamics performance of the fan in animal house, the extractor for animal house (model: 400-4-2) has been taken as the optimization object, and the Computational Fluid Dynamics (CFD) method was used to analyze the airflow nearby the whole extractor. The FreescaX5 3D scanner was used to collect data and reconstruct 3D model of the prototype fan. Then, the prototype fan model was optimized by CFD simulation to investigate the performance and defects of the prototype fan, and thereby to propose the improvement scheme. The simulation results of flow field near the blade showed that the performance of fan was influenced by the impeller numbers, the bending direction and the blade shape. In the numerical simulation, when the wind speed was used as the evaluation standard, the parameters of the optimized fan are as follows, the blade number is 7, the blade bending direction is forward bending, the blade tip angle and root angle is 9.5° and 58.0° respectively, and the blade cross-section shape is streamlined with small airfoil curvature. The air volume of the optimized fan increased by 3.86% when the optimized fan is compared with the prototype fan at the same power. (paper)