軸対称物体から放出される三次元渦の過渡特性 : ライトシート掃引法による三次元可視化画像

概要

論文の詳細を見る
Three-dimensional flow visualization of a vortex-generating region behind a conical axisymmetric body was conducted in a hydraulic flume using computer image-processing techniques. In order to obtain three-dimensional images, a light sheet set normal to the free-stream direction is swept mechanically in the longitudinal direction with periodic motion, and a series of cross-sectional images at very short time intervals of 1/30 second for each sweep were digitized by a video digitizer and input into the computer data storage. Then the time coordinate of each cross-sectional image is converted to a spatial coordinate obtained from the phase information of the sweep to create quasi-instantaneous three-dimensional image data. From the time variation of the three-dimensional images, transitional characteristics of flow behind the body were clarified. In particular, the switching mechanism of issuing direction of spoon-type vortex at Reynolds number of 300 was clarified.
一般社団法人日本機械学会の論文
1994-04-25