Two methods for calculating the blowing force of a fine gas column on a vertical stationary flat plate are provided,namely the momentum theorem method and the kinetic energy theorem method,and the ideas of reference frame switching and Galilean velocity transformation in the latter solution are pointed out.At the same time,it is also pointed out that the physical premise of these two methods is that the fine gas column is an ideal fluid with a relatively small speed of flow.As a comparison,an expression for the blowing force of wind on a circular vertical stationary plate is analyzed and compared with the blowing force of a fine gas column on a vertical stationary plate.It is pointed out that the significant difference lies in the difference in physical mechanism-there is a round about flow phenomenon when the wind interacts with the plate,and the wind is no longer an ideal fluid,and there are obvious signs of turbulence inside it after the roundabout flow.
关键词
细气柱/垂直静止平板/吹力/风/理想流体/绕流
Key words
fine gas column/vertical stationary flat plate/blowing force/wind/ideal fluid/round about flow
维普
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