Experimental Study of Two-Dimensional Grid Turbulence in the Soap Films

• Main Authors: WEI SHEN KUO, 郭威伸
• Other Authors: CHIHYUNG WEN
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/51025242520037082893

碩士 === 大葉大學 === 機械工程研究所 === 87 === The experiment conducted in this soap film tunnel was to verify the double cascade theory in the two-dimensional turbulence. Flow visualization and the measurement of the velocity fluctuations was emphasized in the experiments. A traditional camera was used to visualize the wake behind the grid, with the interests in finding the evolution of the wake vorticies and the interactions between nearby vorticies. LDA was used to measure the velocity fluctuations in the turbulent flow field. The power spectra of the turbulent velocity fluctuations was analyzed and compared to the double cascade theory. The effects of compressibility on two-dimensional turbulence have also been investigated by a series of experiments. No effect has been found.