[1]吴金星,徐 耀,李松歌,等.螺旋管内局部二次流的强度计算及演变规律[J].郑州大学学报(工学版),2023,44(04):29-34.[doi:10.13705/j.issn.1671-6833.2023.04.002]
　WU Jinxing,XU Yao,LI Songge,et al.Intensity Calculation and Development Law of Local Secondary Flow in Helical Tubes[J].Journal of Zhengzhou University (Engineering Science),2023,44(04):29-34.[doi:10.13705/j.issn.1671-6833.2023.04.002]
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螺旋管内局部二次流的强度计算及演变规律()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
44
期数:
2023年04期
页码:
29-34
栏目:
出版日期:
2023-06-01

文章信息/Info

Title:
Intensity Calculation and Development Law of Local Secondary Flow in Helical Tubes
作者:
吴金星;  徐 耀;  李松歌;  肖嘉邦;  马宇翔
郑州大学 机械与动力工程学院,河南 郑州 450001

Author(s):
WU Jinxing;  XU Yao;  LI Songge;  XIAO Jiabang;  MA Yuxiang
School of Mechanical and Power Engineering, Zhengzhou University, 450001, Zhengzhou, Henan

关键词:
迪恩涡;  迪恩数;  局部二次流强度;  螺旋管;  有限体积法
Keywords:
Dean vortex;  Dean number;  local secondary flow intensity;  spiral tube;  finite volume method
分类号:
TK172
DOI:
10.13705/j.issn.1671-6833.2023.04.002
文献标志码:
A
摘要:
为了掌握螺旋管内二次流强度的变化规律,对螺旋管内局部二次流强度及演变规律进行了研究,提出了 无量纲数 H 作为局部二次流强度指标。通过数值模拟得到 H 的体积平均值 H m ,与描述整体二次流强度的迪恩数 进行对比。结果显示,在不同的雷诺数、曲率、螺距下,H m 与迪恩数的相关系数约为 1,且呈现较好的正比关系,说 明 H 能够准确计量局部二次流强度。 同时,探究了几何参数对螺旋管内的二次流演变规律的影响。 依据二次流的 强度,管内流动可分为发展段、过渡段和稳定段:二次流在发展段迅速增强;在过渡段出现最大值;在稳定段呈小幅 度周期性波动。 雷诺数增大会显著增大二次流强度,但是不影响二次流在 3 个阶段出现的位置。曲率的增大会略 微增大二次流的强度,且延长了二次流达到稳定段的路程。螺距对二次流的强度和演变规律影响非常小。
Abstract:
In order to grasp the variation law of secondary flow in helical tube, the local intensity and development law of secondary flow in helical tube were studied, and the dimensionless helical intensity H was proposed as the local secondary flow intensity index. By means of numerical simulation, the average volume of H H m is taken and compared with the Dean number describing the overall secondary flow intensity. The results show that under different Reynolds numbers, curvature and pitch, the correlation coefficient between H m and Dean number is about 1, and there is a good proportional relationship, indicating that H can accurately measure the intensity of local secondary flow. At the same time, the influence of geometric parameters on the development law of secondary flow in the helical tube is explored. According to the intensity of secondary flow, the flow in the helical tube can be divided into development stage, transition stage and stable stage. The secondary flow increases rapidly in the development stage, reaches its maximum value in the transition stage, and fluctuates periodically in the stable stage. The increase of Reynolds number will significantly increase the intensity of secondary flow, but will not affect the location of secondary flow three stages. The increase of curvature will slightly increase the intensity of the secondary flow and extend the distance of the secondary flow to the stable stage. The pitch has little influence on the intensity and development of secondary flow.
更新日期/Last Update: 2023-06-30