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叶片式抛送装置工作时,高速旋转的抛送叶轮所产生的空气流在出料管协助输送物料。为了提高输送效率,采用计算流体力学软件Fluent对叶片式抛送装置内部的三维气流流场进行了模拟,获得了抛送装置出料管气流流场的基本特征。并对出料管处气流速度的模拟值与试验值进行了比较,检验了数值模拟的可靠性。同时,对出料管高度、截面形状等结构参数的不同变化作了对比模拟,得出出料管高度越大,管内气流速度分布越均匀,但平均气流速度越小,可见出料管高度太大不利于输送物料;圆形截面出料管内气流速度分布较均匀且平均气流速度略大,较方形截面和矩形截面管更有利于输送物料。
When the blade throwing device is in operation, the air flow generated by the high-speed rotating throw impeller assists in conveying material in the discharge tube. In order to improve the conveying efficiency, the 3D fluid flow field inside the blade-type throwing device was simulated by the computational fluid dynamics software Fluent, and the basic characteristics of the flow field of the ejector ejecting tube were obtained. The simulation results of the air velocity at the discharge pipe were compared with the experimental values to verify the reliability of the numerical simulation. At the same time, the simulation of different changes of the structure parameters such as the height of the discharge pipe and the cross-sectional shape of the discharge pipe is made. The higher the discharge pipe height is, the more uniform the air velocity distribution in the pipe is, but the smaller the average air flow velocity is, Greatly detrimental to the delivery of materials; circular cross-section of the material flow velocity distribution of the tube more uniform and the average velocity slightly larger than the square cross-section and rectangular cross-section tube is more conducive to the delivery of materials.