Development of CAFV System for the Gas Dynamics

CAFV (Computer Sided Flow Visualization) system for gas dynamics has been developed and is applied to analyze three-dimensional structures of the flow field visualized using laser-induced fluorescence of I2 seeded in Ar. The flow field is visualized by many laser sheets and photographed two-dimensionally by a highly sensitive vidicon camera. These image data are stored up in a personal computer in order to record three-dimensional information on the entire flow field. For the purpose of suppressing the noise, an image datum is made from the averaging of many frame data. From the image data, the pictures at arbitrary cross sections (CT; Computer Tomography) are reproduced on the monitor by the personal computer. The propriety and effectiveness of this system are verified through the results applied to two flow fields, i. e., the free jet expanding into the vacuum chamber and an interacting flow field between the skimmer and the free jet.