PIV measurement of step cavity with driven flow

J. Ocean Eng. Technol. 1998;12(1):113-119.

구동류를 갖는 계단 캐비티의 PIV계측

조대환,김진구,이영호

목표해양대학교 기관공학부,옥천전문대 기계과,한국해양대학교 기계,냉동,자동차공학부

Keywords: Unsteady Flow, High Reynold number, Channel Cavity Flow, PIV, Image Processing

핵심용어: 비정상유동, 고레이놀즈수, 채널캐비티흐름, 입자영상유속계, 영상처리

Abstract

An experimental study was carried out in a three-dimensional cubic cavity driven by 2-dimensional plane Poiseuille flow for three kinds of Reynolds number, $10^4$, 3 $ imes$ $10^4$ and 5 $ imes$ $10^4$ based on the cavity width and cavity inlet mean flow velcoity. Instant simultaneous velocity vectors at whole field were measured by 2-D PIV system. Laser based illumination and two-frame grey-level cross correlation algorithm are adopted. Severe unsteady flow fluctuation within the cavity are remarkable at above Re = 3 $ imes$ $10^4$ Reynolds numbers and sheared mixing layer phenomena are also found at the region where inlet driving Poiseuille flow is collided with the clock-wise rotating main primary vortex at upper center area. Instant velocity profiles reveal that deformed forced vortex formation is observed throughout the separate two areas.