乱流遷移にかかわる円柱まわりの高周波圧力変動

概要

論文の詳細を見る
Generally, the unsteady flow features around a circular cylinder are deeply concerned with flow noises and aeroelastic vibrations of technical interests. The fluctuating pressure, especially at the transition region, is an important factor in the discussion of cavitation inception. In this report, the peculiar characteristics of pressure fluctuations about the cylinder are clarified in the subcritical and the critical region under Re=5×10^5 in our cavitation tunnel at the Tokyo Metropolitan Institute of Technology. The main experimental features are as follows. (1) In the subcritical region without the turbulent transition, the low-frequency fluctuations by Karman vortex are dominant on the shear layer behind the laminar separation. (2) In the critical region, high frequencies due to the turbulent spot of about 1〜6 kHz appear at the turbulent transition point, and these peak frequencies are proportional to the Reynolds number.
一般社団法人日本機械学会の論文
1988-12-25