低旋流数旋进射流流场结构演变的POD分析

付豪; 何创新; 刘应征

doi:10.11729/syltlx20210006

低旋流数旋进射流流场结构演变的POD分析

付豪^{1, 2},
何创新^{1, 2, ,},
刘应征^{1, 2}

1.
上海交通大学机械与动力工程学院叶轮机械研究所，上海　200240
2.
上海交通大学燃气轮机研究院，上海　200240

基金项目: 上海市自然科学基金（20ZR1425700）

详细信息

作者简介:
付豪: （1995-），男，湖北武汉人，博士研究生。研究方向：流场PIV测量技术与射流研究。通信地址：上海市闵行区上海交通大学机械与动力学院C楼315（200240）。E-mail：fuhao950823@sjtu.edu.cn

通讯作者:
何创新: E-mail：chuangxin.he@sjtu.edu.cn

中图分类号: V211.71
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出版历程
- 收稿日期: 2021-01-19
- 修回日期: 2021-03-01
- 网络出版日期: 2021-08-25
- 刊出日期: 2021-08-30

POD analysis of the dynamic structures of a low swirl number precessing jet

FU Hao^{1, 2},
HE Chuangxin^{1, 2, ,},
LIU Yingzheng^{1, 2}

1.
Turbomachinery Research Institute, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai　200240, China
2.
Institute of Gas Turbine, Shanghai Jiao Tong University, Shanghai　200240, China

摘要

摘要: 利用粒子图像测速技术（PIV）对雷诺数Re = 4.5×10⁴的低旋流数旋进射流流场进行了实验测量，并利用本征正交分解（POD）方法对测得的流场进行分解，提取流场中含能大尺度结构。针对3种不同旋流数（S = 0、 0.26和0.41），对比分析了POD分解得到的空间模态以及用POD模态重构后的脉动速度场的变化规律。POD分析得到的结果表明：旋进导致流体交替地从腔体一侧沿着壁面流出，从另一侧流入；旋进刚发生时，上游剪切层内的旋涡结构尚未完全破坏，它们会一直向下游发展直至旋进起始点附近后，开始随着主流一起偏转，而下游剪切层内的大尺度结构被完全破坏；随着旋流数的增加，旋进以及射流的自身振荡被加强，从而导致流场结构更加复杂、大尺度旋涡结构被破坏。
- POD分析 /
- 低旋流数 /
- 旋进射流 /
- 动态结构
Abstract: The flow field of a low swirl number precessing jet at Reynolds number Re = 4.5×10⁴ is measured using particle image velocimetry （PIV） and the dynamics of the large-scale flow structures are examined further using the proper orthogonal decomposition（POD） analysis. The spatial modes obtained by POD and the fluctuating velocity field obtained by POD reconstruction at three swirl numbers, i.e., S = 0, 0.26 and 0.41, are compared and analyzed. The POD results show that the precession induces an alternating flow, switching between outflow from one side of the chamber along the chamber wall and inflow from another side. When the precession occurs, the vortex structures in the upstream shear layers have not broken down completely. They will develop downstream until approaching the starting point of the precession and then deflect with the mainstream. However, the large-scale structures in the downstream shear layers are completely destroyed. As the swirl number increases, the region affected by the precession moves upstream, and the orderly vortex structures in the shear layers break down.
- POD analysis /
- low swirl number /
- precessing jet /
- dynamic structures

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图 1 实验装置示意图和几何尺寸

Fig. 1 Schematic diagram of the experimental setup and geometric sizes

下载: 全尺寸图片幻灯片

图 2 POD模态前十阶特征值

Fig. 2 Eigenvalues of the first ten POD modes

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图 3 旋流数 S = 0 时区域Ⅰ内的前六阶模态

Fig. 3 The first six POD modes in zone Ⅰ at swirl number S = 0

下载: 全尺寸图片幻灯片

图 4 原始流场（a）-（d）及重构脉动速度场（e）-（h）云图（旋流数 S = 0，区域Ⅰ）

Fig. 4 Contour plot of (a)-(d) the original field and (e)-(h) the recon-structed fluctuating velocity field (swirl number S = 0, zone Ⅰ)

下载: 全尺寸图片幻灯片

图 5 旋流数 S = 0 时区域Ⅱ内的前六阶模态

Fig. 5 The first six POD modes in zone Ⅱ at swirl number S = 0

下载: 全尺寸图片幻灯片

图 6 原始流场（a）-（d）及重构脉动速度场（e）-（h）云图（旋流数 S = 0，区域Ⅱ）

Fig. 6 Contour plot of (a)-(d) the original field and (e)-(h) the recon-structed fluctuating velocity field (swirl number S = 0, zone Ⅱ)

下载: 全尺寸图片幻灯片

图 7 旋流数 S = 0.26 时区域Ⅰ内的前六阶模态

Fig. 7 The first six POD modes in zone Ⅰ at swirl number S = 0.26

下载: 全尺寸图片幻灯片

图 8 原始流场（a）-（d）及重构脉动速度场（e）-（h）云图（旋流数 S = 0.26，区域Ⅰ）

Fig. 8 Contour plot of (a)-(d) the original field and (e)-(h) the recon-structed fluctuating velocity field ( S = 0.26, zone Ⅰ)

下载: 全尺寸图片幻灯片

图 9 旋流数 S = 0.26 时区域Ⅱ内的前六阶模态

Fig. 9 The first six POD modes in zone Ⅱ at swirl number S = 0.26

下载: 全尺寸图片幻灯片

图 10 原始流场（a）-（d）及重构脉动速度场（e）-（h）云图（旋流数 S = 0.26，区域Ⅱ）

Fig. 10 Contour plot of (a)-(d) the original field and (e)-(h) the recon-structed fluctuating velocity field ( S = 0.26, zone Ⅱ)

下载: 全尺寸图片幻灯片

图 11 旋流数 S = 0.41 时区域Ⅰ内的前六阶模态

Fig. 11 The first six POD modes in zone Ⅰ at swirl number S = 0.41

下载: 全尺寸图片幻灯片

图 12 原始流场（a）-（d）及重构脉动速度场（e）-（h）云图（旋流数 S = 0.41，区域Ⅰ）

Fig. 12 Contour plot of (a)-(d) the original field and (e)-(h) the recon-structed fluctuating velocity field ( S = 0.41, zone Ⅰ)

下载: 全尺寸图片幻灯片

图 13 旋流数 S = 0.41时区域Ⅱ内的前六阶模态

Fig. 13 The first six POD modes in zone Ⅱ at swirl number S = 0.41

下载: 全尺寸图片幻灯片

图 14 原始流场（a）-（d）及重构脉动速度场（e）-（h）云图（旋流数 S = 0.41，区域Ⅱ）

Fig. 14 Contour plot of (a)-(d) the original field and (e)-(h) the recon-structed fluctuating velocity field (S = 0.41, zone Ⅱ)

下载: 全尺寸图片幻灯片

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