Development of 3-D Stereo PIV and Its Application to a Delta Wing

  • Kim, Beom-Seok (Graduate school, mechanical engineering department, korea maritime university) ;
  • Lee, Hyun (Graduate school, mechanical engineering department, korea maritime university) ;
  • Choi, Jang-Woon (Image Information Technology Co., Ltd.) ;
  • Kadooka, Yoshimasa (Department of computer science engineering, kanazawa university) ;
  • Tago, Yoshio (Department of computer science engineering, kanazawa university) ;
  • Lee, Young-Ho (Division of mechanical&information engineering, korea maritime university.)
  • Published : 2003.11.05

Abstract

A process of 3-D stereo particle image velocimetry(PIV)was developed for the measurement of an illuminated sliced section field of 3-D complex flows. The present method includes modeling of camera by a calibrator based on the homogeneous coordinate system, transformation of the oblique-angled image to the right-angled image, identification of 2-D velocity vectors by 2-D cross-correlation equation, stereo matching of 2-D velocity vectors of two cameras, accurate calculation of 3-D velocity vectors by homogeneous coordinate system, removal of error vectors by a statistical method followed by a continuity equation criteria, and finally 3-D display as the post processing. An experimental system was also used for the application of the proposed method. Two high speed digital CCD cameras and an Argon-Ion Laser for the illumination were adopted to clarify the time-dependent characteristics of the leading edge extension(LEX) in a highly swept shape applied to a delta wing found in modern air-fighters.