Flow distortion in a circular-to-rectangular transition duct

Jiun-Jih Miau, Tzong-Shyng Leu, Jung-Hua Chou, S. A. Lin, J. J. Miau

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Experiments were made for three circular-to-rectangular transition ducts with different transition lengths at Reynolds numbers which ranged from 4 × 103 to 2 × 104. The Reynolds number is based on the inlet boundarylayer thickness and a reference freestream velocity measured upstream of the transition duct. The results indicate that the major driving force for flow in the duct to behave three dimensionally is the cross-streamwise pressure gradient, which results from the contoured wall. A three-dimensional separation bubble was found to occur on the diverging wall at Re = 4 × 103, but disappeared at higher Reynolds numbers when the boundary layer upstream of the geometrical deformation section was turbulent. The secondary flow pattern developed at the exit cross-sectional plane was mapped out in detail by a three-dimensional velocity measurement technique. The results further indicated that the development of the secondary flow in the corner region was mainly caused by the mean-flow distortion effect.

Original languageEnglish
Pages (from-to)1447-1456
Number of pages10
JournalAIAA journal
Volume28
Issue number8
DOIs
Publication statusPublished - 1990 Jan 1

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Ducts
Reynolds number
Secondary flow
Pressure gradient
Velocity measurement
Flow patterns
Boundary layers
Experiments

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

Miau, Jiun-Jih ; Leu, Tzong-Shyng ; Chou, Jung-Hua ; Lin, S. A. ; Miau, J. J. / Flow distortion in a circular-to-rectangular transition duct. In: AIAA journal. 1990 ; Vol. 28, No. 8. pp. 1447-1456.
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Flow distortion in a circular-to-rectangular transition duct. / Miau, Jiun-Jih; Leu, Tzong-Shyng; Chou, Jung-Hua; Lin, S. A.; Miau, J. J.

In: AIAA journal, Vol. 28, No. 8, 01.01.1990, p. 1447-1456.

Research output: Contribution to journalArticle

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AU - Miau, Jiun-Jih

AU - Leu, Tzong-Shyng

AU - Chou, Jung-Hua

AU - Lin, S. A.

AU - Miau, J. J.

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