Affiliations: Department of Mechanical Design, Sungkyunkwan
University, 300 ChunChun-Dong, JangAn-Gu, Suwon, KyungGi-Do 440-746,
Korea | Department of Human and Engineered Environmental
Studies, School of Frontier Sciences, The University of Tokyo, 5-1-5
Kashiwano-ha, Kashiwa, 277-8563, Japan | School of Mechanical Engineering, Sungkyunkwan
University, 300 ChunChun-Dong, JangAn-Gu, Suwon, KyungGi-Do 440-746, Korea.
E-mail: hanseoko@skku.edu
Abstract: Velocity and density distributions of a high-speed and initial CO_{2}
jet flow have been analyzed concurrently by a developed three-dimensional
digital speckle tomography and a particle image velocimetry (PIV). Two
high-speed cameras have been used for the tomography and one for the PIV since
a shape of a nozzle for the jet flow is bilaterally symmetric and the starting
flow is fast and unsteady. The speckle movements between no flow and CO_{2} jet
flow have been obtained by a cross-correlation tracking method so that those
distances can be transferred to deflection angles of laser rays for density
gradients. The three-dimensional density fields for the high-speed CO_{2} jet flow
have been reconstructed from the deflection angles by the real-time tomography
method, and the two-dimensional velocity fields have been calculated by the PIV
method concurrently and instantaneously.
