2026-03-09T15:33:36Z https://miyazaki-u.repo.nii.ac.jp/oai

oai:miyazaki-u.repo.nii.ac.jp:00006194 2024-07-10T23:31:27Z 73 73:36 73:36:330 73:36:330:469

ランダム位相法において入力周波数が乱流スケールに及ぼす 影響に関する観察 Observation of the Effect of Input Frequencies on Turbulent Scale by Random-Phase Method 若松, 祐亮 31437 ワカマツ, ユウスケ Wakamatsu, Yusuke Shin, B. 31439 申, 炳録 シン, ビョンロク Shin, Byeongrog 若松, 祐亮 31437 ワカマツ, ユウスケ Wakamatsu, Yusuke Shin, B. 31439 申, 炳録 シン, ビョンロク Shin, Byeongrog Multi-fan wind tunnel Integral scale Control of turbulent scale Random-phase method Control of turbulence intensity and scale is fundamentally important in the study of turbulence. In this study, we used a random-phase method to investigate the effect of input frequencies on the turbulent scale. The method makes use of shear layers generated between the outfows from adjacent ducts, and is realized high intensity (12-16%) and large integral scale (0.6-0.7m). It is known that the vortex size depends on the size of the lattice in studies using lattice turbulence, while there is no equivalent in the random phase method. This study aims to clarify the dominant parameter for the integral scale in the random phase method, and examines its dependence using turbulence with different frequencies. As experimental results the scale depended on the frequencies of the input velocity signal. Thus, it is expected that the scale might be controlled by the frequencies. departmental bulletin paper 宮崎大学工学部 Faculty of Engineering, University of Miyazaki 2020-09 VoR application/pdf 宮崎大学工学部紀要 49 29 32 Memoirs of Faculty of Engineering, University of Miyazaki AA00732558 05404924 https://miyazaki-u.repo.nii.ac.jp/record/6194/files/Engineering_49_p29.pdf http://hdl.handle.net/10458/00010067 https://miyazaki-u.repo.nii.ac.jp/records/6194 jpn