Intensity Calculation and Development Law of Local Secondary Flow in Helical Tubes
[1]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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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
44
Number of periods:
2023 04
Page number:
29-34
Column:
Public date:
2023-06-01
- Title:
- Intensity Calculation and Development Law of Local Secondary Flow in Helical Tubes
- Keywords:
- Dean vortex; Dean number; local secondary flow intensity; spiral tube; finite volume method
- CLC:
- TK172
- 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.
- References:
- -
- Similar References:
Memo
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Last Update:
2023-06-30
