Open AccessExperiments on quasi-two-dimensional dipolar vortex streets generated by a moving momentum source in a stratified fluid
Author(s) -
Ke Chen,
You Yun-xiang,
Hu Tian-Qun,
Meiping Zhu,
Xiaoqing Wang
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.024702
Subject(s) - froude number , dimensionless quantity , vortex , physics , momentum (technical analysis) , reynolds number , mechanics , dipole , angular momentum , jet (fluid) , classical mechanics , turbulence , flow (mathematics) , quantum mechanics , finance , economics
Experiments were carried out in a stratified fluid with a momentum source modeled by a horizontally moving jet. The generation mechanism was investigated and the evolution characteristics were analyzed for the quasi-two-dimensional dipolar vortex streets generated by such a moving momentum source in the stratified fluid. The conditions of different Reynold and Froude number (Re, Fr) combinations under which the dipolar vortex street can be generated by moving momentum source were determined by use of data based on the present series of experiments. Moreover, the dependence of the dimensionless formation time and inverse dimensionless average wavelength of the dipolar vortex street on Fr for different values of Re was obtained. The results show that these parameters are independent of Re and approximately follow some exponential laws of Fr.