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Abstract: The parametric design model of the screw shaft with variable diameter and variable pitch is established under the condition of ensuring even flow rate of material, and an example of engineering application of parametric design of screw shaft is given. By utilizing the mixture theory based on mean weighting function of area, a 3D analysis model of material flow under the drive of the designed screw shaft is built. Through numerical simulation and analysis, the influence of the working speed and diameter-to-pitch ratio of the screw shaft upon the three-dimensional flow and mixing effect of the material is researched, the relation between the working speed of screw shaft and the material conveying performance is discussed, and the distribution cloud figure of the mean weighting function of the area of screw axial flow field, at the same time, the corresponding conclusion are obtained, and which provides a theoretical basis for the structure design of screw shaft with variable diameter and variable pitch. The screw shaft with variable diameter and variable pitch produced by utilizing the contents of this research has been applied in enterprises.
Key words: Screw conveyor Variable diameters Variable pitches Mixing effect Parametric model Performance simulation
CLC No:
TH224
国家自然科学基金(50475143)、湖南省教育厅(04C654)和湘潭大学博士启动基金(06QDZ16)资助项目.
Received
20070606,
received
in
revised
form
20071220
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