PIV를 이용한 다양한 배열에서 2원주 주위의 유동장 가시화

The characteristics of the flowfields around two circular cylinders in various arrangements were investigated by PIV. In tandem arrangement, the Strouhal numbers measured in the rear region of the cylinder of wake side were decreased with the space ratios, the flow between two cylinders was almost stagnated and the closer to upstream cylinder, the larger the width of the stagnated region was. The direction of vortex between two cylinders was opposed each other with the small difference(α＝±1.0°) of the attack angle α. In side by side arrangement, the flow velocity between two circular cylinders were increased with the space ratios.