Investigation of the flow mechanisms in an axial fan with casing treatment at different Reynolds numbers

Jiangbin Zhao, Ziliang Li, Qiaodan Luo, Xingen Lu, Ge Han and Mingyang Wang

Energy, 2025, vol. 323, issue C

Abstract: This study investigates the effects of Reynolds number (Re) and axial slot casing treatment (ASCT) on the performance and internal flow mechanisms of a single-stage fan using a validated numerical method. The effect of Re and ASCT on the performance of the fan are studied. A dimensionless loss analysis method based on the first law of thermodynamics is adopted to quantitatively assess the flow loss inside the fan. The results show that there are significant differences in the flow field and efficiency at different Re due to differences in the boundary layer thickness and the spanwise separation degree. The difference between the boundary layer and secondary flow losses is the main reason for the efficiency discrepancy at different Re. The thicker boundary layer at low Re and the more severe secondary flow make the loss caused by the velocity gradient more significant. The broadening of the stall margin is attributed to the bleed and injection of the secondary flow caused by the recirculation of the ASCT. The ASCT has a significant effect on the inner loss of the rotor but no obvious effect on the stator. The source distribution of the loss is almost unaffected by the ASCT.

Keywords: Reynolds number; Casing treatment; Flow mechanism; Flow loss mechanism; Quantitative loss analysis (search for similar items in EconPapers)
Date: 2025
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544225014318
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:323:y:2025:i:c:s0360544225014318

DOI: 10.1016/j.energy.2025.135789

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().