Analysis of vortical flow field in a propeller fan by LDV measurements and LES—Part II: Unsteady nature of vortical flow structures due to tip vortex breakdown

Choon Man Jang, Masato Furukawa, Masahiro Inoue

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

The unsteady nature of vortex structures has been investigated by a large eddy simulation (LES) in a propeller fan with a shroud covering only the rear region of its rotor tip. The simulation shows that the tip vortex plays a major role in the structure and unsteady behavior of the vortical flow in the propeller fan. The spiral-type breakdown of the tip vortex occurs near the midpitch, leading to significant changes in the nature of the tip vortex. The breakdown gives rise to large and cyclic movements of the tip vortex, so that the vortex impinges cyclically on the pressure surface of the adjacent blade. The movements of the tip vortex cause the leading edge separation vortex to oscillate in a cycle, but on a small scale. The movements of the vortex structures induce high-pressure fluctuations on the rotor blade and in the blade passage.

Original languageEnglish
Pages (from-to)755-761
Number of pages7
JournalJournal of Fluids Engineering, Transactions of the ASME
Volume123
Issue number4
DOIs
Publication statusPublished - Dec 2001

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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