音響加振を受けた混合層に関する研究 : 第2報,渦の合体に伴う三次元かく乱の発達過程

概要

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An experimental study was conducted to investigate the effects of acoustic waves on the growth of three-dimensional perturbations in a plane mixing layer using a novel experimental technique in a towing tunnel. The mixing layer in the transitional regime at Re_m ≈ 100 based on the momentum thickness was investigated by means of flow visualization/flying hot-wire technique. We found that vortex pairing in the mixing layer excited with a subharmonic mode prevents (or delays) the rapid growth of three-dimensionality. In contrast, delayed pairing with a fundamental mode can result in significant growth of three-dimensionality prior to the pairing, where the rollers are bent in the spanwise direction due to the secondary instability of the elliptic vortex. These results are in good agreement with the observations of simulated mixing layers at Re_m=112. The mechanisms responsible for the growth of three-dimensionality during pairing are described.
社団法人日本機械学会の論文
1995-06-25