Experimental study on surface pressure and flow structure around a triangular prism located behind a porous fence

Cheol Woo Park, Sang Joon Lee

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Flow structure around porous wind fences and the rear coal stockpile model embedded in an atmospheric boundary layer was investigated experimentally by measuring the surface pressure and flow velocity. The experiments were carried out in a closed-return type subsonic wind tunnel with various oncoming atmospheric boundary layers. Various front fences with different porosity and a back fence of porosity ε=40% were tested. The fence and prism models were both 40 mm high; the Reynolds number based on the model height (h) and free stream velocity was about Re = 3.9 × 104. The velocity field around the prism model and surface pressures were measured using the single-frame double-exposure particle image velocimetry system and an electronic pressure scanner, respectively. As a result, the mean pressure and pressure fluctuations on the model surface were strongly affected by the porosity of front fence. The wind fence with porosity ε=40-50% seems to be effective for attenuating the pressure fluctuations on the prism surface. A back fence behind the prism model reduces pressure fluctuations largely on the leeward surface of the prism, compared with the single front fence case. When a wind fence of porosity ε=40% is installed in front of the prism, the speed of bleed-flow behind the fence is largely reduced down to 1/3 compared with no fence case.

Original languageEnglish
Pages (from-to)165-184
Number of pages20
JournalJournal of Wind Engineering and Industrial Aerodynamics
Volume91
Issue number1-2
DOIs
StatePublished - Jan 2003

Keywords

  • Particle image velocimetry (PIV)
  • Porosity
  • Surface pressure
  • Triangular prism
  • Wind fence

Fingerprint

Dive into the research topics of 'Experimental study on surface pressure and flow structure around a triangular prism located behind a porous fence'. Together they form a unique fingerprint.

Cite this