粒子画像の相互相関を用いた噴流内ガス流動計測

概要

論文の詳細を見る
Particle image velocimetry (PIV) for measuring velocity vectors in a turbulent flow is developed based on high-speed photographs obtained by means of a laser light-sheeting method. The velocity vector is estimated by calculating a two dimensional cross-correlation coefficient between two photos which have a small time interval. Characteristics of turbulent eddies in a nitrogen jet are clarified from the obtained vorticity distribution, and from the distributions of strain rate and divergence which are calculated from the velocity distribution. In addition, the accuracy of PIV is assessed using the simulated image. The result shows that to suppress an error due to appearance and disappearance of particles, it is necessary to distribute particles uniformly in the test section, whereas to suppress errors due to random motions and rotational motions, it is necessary to distribute the particle heterogeneously.
1996-01-25