Turbulent near-wakes of periodic array of square blocks on a plate

Shiki Okamoto, Kazumi Tsunoda, Tomohide Katsumata, Nobuaki Abe, Masamichi Kijima

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This paper describes the experimental study of the flow structure past square blocks located on a ground plate with various spacings. The experiment was carried out in a circuit type wind tunnel of a 200 × 200 mm working section and 2000 mm in length at a Reynolds number of 990, which is based on the free-stream velocity and the height of block. The test blocks, side length D = 23 mm and height H = 5 mm, were aligned at a regular spacing S in a square array on the lower wall of the test section, and the spacing was systematically varied to provide S/H = 2, 3, 5, 7, 10, and 13. The mean velocity and turbulence intensities were measured by a laser Doppler velocimeter (LDV). It was found that the spacing ratio S/H = 7 is optimum to augment the turbulence intensity near the ground plate when the repeated blocks are aligned in a square array.

Original languageEnglish
Pages (from-to)211-218
Number of pages8
JournalInternational Journal of Heat and Fluid Flow
Volume17
Issue number3
DOIs
Publication statusPublished - 1996 Jun

Fingerprint

turbulent wakes
near wakes
Turbulence
spacing
Laser Doppler velocimeters
Flow structure
Wind tunnels
Reynolds number
turbulence
laser doppler velocimeters
Networks (circuits)
free flow
wind tunnels
Experiments

Keywords

  • Laser Doppler velocimeter (LDV)
  • Reattachment
  • Square block
  • Turbulence
  • Turbulent flow
  • Velocity distribution

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

Turbulent near-wakes of periodic array of square blocks on a plate. / Okamoto, Shiki; Tsunoda, Kazumi; Katsumata, Tomohide; Abe, Nobuaki; Kijima, Masamichi.

In: International Journal of Heat and Fluid Flow, Vol. 17, No. 3, 06.1996, p. 211-218.

Research output: Contribution to journalArticle

Okamoto, Shiki ; Tsunoda, Kazumi ; Katsumata, Tomohide ; Abe, Nobuaki ; Kijima, Masamichi. / Turbulent near-wakes of periodic array of square blocks on a plate. In: International Journal of Heat and Fluid Flow. 1996 ; Vol. 17, No. 3. pp. 211-218.
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