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The purpose of present paper is to examine experimentally the drag reduction of the bluff bodies due to the cutout of the rectangular shape at the front edges of the square prism. The drag, the base-pressure, Strouhal number and the pressure distribution in the case of the rectangular cutout of various dimensions were measured and the visualization of the flow past the body was performed by means of the hydrogen babbles. The root mean square distribution of the velocity fluctuation was also measured by hot wire anemometer. The present experiment shows: (1) The distincture pattern of drag reduction for the cutout dimensions was shown by the contour of drag. (2) It shows that there is a case where the drag of the square prism is smaller than that of the circular cylinder and its case exists for wide reigns of cutout dimension. (3 ) As the minimum pressure of the edge of the cutout decrease, the absolute of the base-pressure decrease.

Effect of Cutout at Front Edges to Drag Reduction of Square Prism.