矩形截面螺旋通道内的二次流流场特性

马源 1; 曹文瑾 2; 林梅 2

doi:10.7652/xjtuxb201408021

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矩形截面螺旋通道内的二次流流场特性

更新时间：2025-07-09

- 矩形截面螺旋通道内的二次流流场特性
- Secondary Flow Characteristics in Helical Rectangular Channel
- 西安交通大学学报 2014年48卷第8期页码：122-127
- 作者机构：
  
  开封空分集团有限公司,河南,开封,475002
- 作者简介：
- 基金信息：
  
  : 2014-03-26。作者简介: 马源(1969—),女,高级工程师;林梅(通信作者),女,高级工程师。基金项目: 国家自然科学基金资助项目(51376145)
- DOI：10.7652/xjtuxb201408021
  中图分类号： TQ0211
- 网络首发：2014-08-10，
  
  纸质出版：2014
- 稿件说明：
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马源 1, 曹文瑾 2, 林梅 2. 矩形截面螺旋通道内的二次流流场特性[J]. 西安交通大学学报, 2014,48(8):122-127.

Secondary Flow Characteristics in Helical Rectangular Channel[J]. 2014, 48(8): 122-127.
马源 1, 曹文瑾 2, 林梅 2. 矩形截面螺旋通道内的二次流流场特性[J]. 西安交通大学学报, 2014,48(8):122-127. DOI： 10.7652/xjtuxb201408021.

Secondary Flow Characteristics in Helical Rectangular Channel[J]. 2014, 48(8): 122-127. DOI： 10.7652/xjtuxb201408021.

摘要

为了揭示螺旋通道横截面全流场信息

利用二维粒子图像测速仪(PIV)对高宽比为5:7的矩形截面螺旋通道第二个螺距内的5个横截面流场进行了实验测量

获得了不同雷诺数下、不同横截面的二次流瞬态流场以及涡量场图像。实验结果表明:靠近螺旋通道外壁面下角处存在低速区

并产生了一个顺时针方向的旋涡

而螺旋通道内壁上角处同样存在低速区并产生了一个旋转方向相反的小旋涡

内壁上角和外壁下角的正负涡量绝对值较大; 随着螺旋角的上升

横截面的二次流高速区速度分布由内侧逐步向外侧移动

使得外侧速度增加

其截面中心处二次流方向是自下向上流动; 流体旋转一圈半后

螺旋流动达到稳定状态。此研究结果可为螺旋通道的强化换热设计提供一定的参考。

Abstract

The flow fields of 5 cross-sections for the second pitch in a helical rectangular channel with height/width ratio of 5/7 are investigated by two-dimensional particle image velocimetry(PIV)

and the secondary flow field and vorticity field for different cross-section are analyzed under different Reynolds numbers. The transient flow characteristics of the channel cross-section are revealed. A low-speed zone exists and a large clockwise vortex is obviously observed at the lower corner of the outer wall near the helical rectangular cross-section

while a low-speed zone also exists and a small counterclockwise vortex is observed at the upper corner of the inner wall. The absolute value of both positive and negative vorticity becomes larger at the upper-corner of the inner wall surface and the lower-corner of outer wall surface. The fluid higher velocity zone gradually moves from the inner to outer region of the helical channel with the increasing helical angle. Moreover

the secondary flow at the cross-section center transmits from the bottom wall to upper wall

and the helical flow tends to be steady after one and a half spiral circles. The results provide reference for enhanced heat transfer design of helical channel.

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references

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