不同环状缝隙宽度下管道车车后断面轴向流速特性研究

Axial Velocity Characteristics of Cross Section Behind Piped Carriage with Different Width of Annular Gap

管道车车后流场作为柱系绕流流场的一部分,尾迹绕流可能会对管道车柱系结构产生影响,进而影响管道车柱系结构稳定性。为此分析了4个不同缝隙宽度下管道车车后断面的轴向流速特性。结果表明,车后断面轴向流速受管道车结构影响呈区域性分布;距离管道车一定时,环状缝隙越小,相同断面轴向速度变化幅度越剧烈;管道车车后轴向流速变化幅度沿程减小,管道车对水流的影响沿程衰减,速度大小沿程向断面平均流速靠拢。

As a part of the flow field around the cylinders, the llow tleld behind the piped carriage may nave impact on the piped carriage structure, and influences the stability of the piped carriage structure. Therefore, the axial velocity characteristics of the cross section behind the piped carriage with 4 different gap widths were analyzed. The results show that the axial velocity of the back section of the piped carriage is affected by the structure of the piped carriage and the axi aI velocity distribution of the section is regional. When the distance between the section and the piped carriage is constant, the smaller the annular gap width is, the more dramatic the axial velocity change of the same section is. The axial velocity ＂s amplitude of variation decreases along the course. The influence of the piped carriage on the water flow is attenuated a- long the course. The velocity is close to the average velocity of the cross section.