过渡流下钝体绕流特性的可视化实验对比

发布时间：2018-05-21 14:53

本文选题：粒子图像测速 + 过渡　；参考：《化工学报》2016年S1期

【摘要】：为解明钝体绕流机理,设计了开式低速循环水槽,建立了钝体绕流实验平台。采用粒子图像测速法(PIV)和染色法,对钝体绕流特性进行实验研究。采用INSIGHT 4G进行全面调控。通过检测水槽不同高度激光面上的流动状态验证实验台稳定性。将PIV及染色法所得数据与已有模拟及实验结果进行对比,验证了实验方法正确性。选取过渡流下特定钝体(圆柱)进行周期研究,探寻钝体绕流周期性。并分析圆柱、方柱绕流在不同Reynolds数下的流动特性异同。实验表明:Re=200时,在一个周期内,圆柱周围正涡、负涡周期性脱落,正涡逐渐形成、增强、消散,负涡也在对应的位置循环发展。通过圆、方柱流动实验对比可知,圆柱绕流分离点不固定而方柱绕流分离点固定,位于其前后锐边上。
[Abstract]:In order to understand the mechanism of the flow around the blunt body, an open low speed circulating flume was designed, and an experimental platform for the flow around the blunt body was established. Particle image velocimetry (PIV) and staining method were used to study the flow characteristics of blunt body. Adopt INSIGHT 4G to carry on overall regulation. The stability of the experimental platform was verified by detecting the flow state on the laser surface at different heights. The validity of the experimental method is verified by comparing the data obtained by PIV and the staining method with the existing simulation and experimental results. The periodic study of a specific blunt body (cylinder) under transitional flow is carried out to find out the periodicity of the flow around the obtuse body. The characteristics of flow around cylinder and square cylinder under different Reynolds numbers are analyzed. The experimental results show that in one period, the positive vortex around the cylinder shedding periodically, the positive vortex gradually forms, strengthens and dissipates, and the negative vortex circulates in the corresponding position. By comparing the flow experiments of circular and square columns, it can be seen that the separation points around the cylinder are not fixed and the separation points around the square column are fixed, which is located at the sharp edge of the cylinder.
【作者单位】：南通大学机械工程学院;
【基金】：国家自然科学基金项目(51476080)~~
【分类号】：O357.5

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