Flow Past a Square Prism with Cut-Corners (Effect of the Angle of Attack)

• UEDA Yoshiaki

  Graduate School of Engineering, Hokkaido University

• KURATA Mitsuo

  Department of Mechanical Engineering, Setsunan University

• KIDA Teruhiko

  Graduate School of Engineering, Osaka Prefecture University

• IGUCHI Manabu

  Graduate School of Engineering, Hokkaido University

Abstract

This study aims to investigate drag reduction of a square prism with cut-corners for nonzero values of the angle of attack α. Selected cutout dimensions are mainly (i) c₁/a = c₂/a = 0.00, (ii) c₁/a = 0.15 and c₂/a = 0.05 and (iii) c₁/a = 0.15 and c₂/a = 0.25. The flow patterns are visualized by using a vortex particle method for Re = 200, and experimentally a hydrogen-bubble (for Re = 4000) and an oil-flow (for Re = 10000) techniques. In addition, the hydrodynamic force on the prism is experimentally measured with either a digital manometer (for pressure coefficient C_p) or a force transducer (for drag and lift coefficients C_D and C_L).Results for some kinds of flow patterns and the measured hydrodynamic coefficients were given with respect to the angle of attack α. Within the present conditions, the cutout dimension of (iii) c₁/a = 0.15 and c₂/a = 0.25 achieves the effective drag reduction in the range 0°<img src="/jstage/pub/jjsem/images/abstractGraphics/12_s23_2.jpg"/> α <img src="/jstage/pub/jjsem/images/abstractGraphics/12_s23_1.jpg"/>14° although this dimension unfortunately causes the oscillation of the gallop at about α = 10°.

Journal

• Journal of the Japanese Society for Experimental Mechanics

  Journal of the Japanese Society for Experimental Mechanics 12 (Special_Issue), s23-s28, 2012

  The Japanese Society for Experimental Mechanics

Keywords

• Square Prism
• Angle of Attack
• Hydrogen-Bubble Technique
• Oil Flow Technique
• VorLex Particle Method

Details

• CRID: 1390282680166717184
• NII Article ID: 10031047648
• NII Book ID: AA11822914
• DOI: 10.11395/jjsem.12.s23
• ISSN: 18844219
• ISSN: 13464930
• NDL BIB ID: 023982080
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I023982080
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed