He-Neレーザを利用したスペックル写真法による二次元流速分布の測定と可視化 : 第2報,円軸円筒クェット流れへの適用と主として速度方向に関する測定精度

概要

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The laser speckle photography technique has the advantage of obtaining a whole instantaneous two-dimensional velocity distribution as the vector quantity. However, there have been few reports on the measuring accuracy of this technique. Furthermore, most of these reports employed a high-power laser, e.q. an argon laser or a ruby pulse laser, as a light source. In this study, a He-Ne gas laser is employed in order to enhance the validity of the technique. This technique is applied to the coaxial cylindrical Couette flow to discuss the measuring accuracy of the velocity vector, especially the velocity direction. The measuring results agree with the analytical solution within ±10 % at the local scalar quantity of the velocity ν_θ(γ)=0.01〜0.40 m/s, and within ±2 degrees in the velocity direction.
一般社団法人日本機械学会の論文
1988-08-25