Effect of aspect ratio of a triangular prism on wake field

JIANG Yurong; JIANG Jianhua; BAO Feng

doi:10.7638/kqdlxxb-2018.0015

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Effect of aspect ratio of a triangular prism on wake field

更新时间：2026-05-28

- Effect of aspect ratio of a triangular prism on wake field
- Vol. 37, Issue 6, Pages: 901-907(2019)
- 作者机构：
  
  厦门大学航空航天学院,福建,厦门,361005
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2018.0015
  CLC： V211.76
- Published：2019
- 稿件说明：
移动端阅览
江裕荣, 江建华, 鲍锋. 三棱柱尺度比对尾流场的影响[J]. 空气动力学学报, 2019, 37(6): 901-907.

JIANG Yurong, JIANG Jianhua, BAO Feng. Effect of aspect ratio of a triangular prism on wake field[J]. 2019, 37(6): 901-907.
江裕荣, 江建华, 鲍锋. 三棱柱尺度比对尾流场的影响[J]. 空气动力学学报, 2019, 37(6): 901-907. DOI： 10.7638/kqdlxxb-2018.0015.

JIANG Yurong, JIANG Jianhua, BAO Feng. Effect of aspect ratio of a triangular prism on wake field[J]. 2019, 37(6): 901-907. DOI： 10.7638/kqdlxxb-2018.0015.

摘要

应用粒子成像测速技术（Particle Image Velocimetry，PIV）对不同柱体截面尺度比

（

=3.8、1.9、1.2、0.9、0.7）的三棱柱在雷诺数

=500条件下的尾流场进行定量测量。对尾流场进行定常和非定常分析，同时结合本征正交分解法和时间空间关联法，研究尺度比

对尾流场相干结构以及尾流场中涡街稳定运输区和涡街流向运输速率的影响。研究发现，三棱柱尺度比

的减小对尾流宽度、尾涡形成长度都有明显的促进作用，但旋涡脱落变慢，非定常性变弱。分析各阶模态对湍动能的贡献，发现随着尺度比

的减小，高阶模态湍动能占比之和有所增加。这就导致尾流场愈加不稳定，涡街稳定运输区域、涡街流向输运速率均减小。同时尾流宽度增大，尾流场阻力系数

增大。

Abstract

The wake field of a triangular prism is studied quantitatively in this paper by using particle image velocimetry (PIV) measurement

with different aspect ratios

(

=3.8

1.9

1.2

0.9

and 0.7) at a Reynolds number

=500. On the basis of steady and unsteady analyses

proper orthogonal decomposition (POD) and time-space cross correlation method are performed to analyse the influence of aspect ratios

on the coherent structure of the wake field

the steady-state transport zone

and vortex streamwise transport rate. The results show that

an increase in the width of the wake flow and the length of the wake vortex is gene

rally related to a decrease in aspect ratio

leading to vortex shedding slowing down and the unsteadiness of wake field weakening. A POD was performed to analysis the contribution of each mode on turbulent kinetic energy. It was found that the sum of high-order modal kinetic energy increased at low aspect ratio

with unstable wake field

decreased the steady-state transport zone and vortex streamwise transport rate. As a result

drag force coefficient increased with the increase in the width of the wake flow.

关键词

Keywords

references

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