円形速度バイアスを用いる流れ場の三次元計測法

概要

論文の詳細を見る
In this paper, a new technique to measure the instantaneous three-dimensional velocity of flow is introduced. Velocity vectors of flow are obtained by measuring the three-dimensional movements of tracer particles suspended in the fluid. By introducing a refractor on the TV camera lens, the image of the tracer particle is displaced corresponding to the distance between the TV camera and tracer particle. Upon rotating the refractor at high speed during the TV camera exposure, spiral streaks of moving particles appear on an image since the circular shift is added to the movement of tracer particles. Each spiral streak contains three-dimensional information on the moving particle since the size of the streak is inversely proportional to the distance of the particle from the camera. The location and size of the spiral streak in the image are related to the three-dimensional location of the particle, and the pitch and size variations of the streak are related to the three-dimensional velocity of the tracer particle. We applied the technique to the measurement of three-dimensional water flow in the test tank and obtained satisfactory results.
一般社団法人日本機械学会の論文
1996-02-25