Research for Suction Control on Roof Wind Pressure of Low-rise Building

—With the application of boundary layer theory, the N-S equation in the boundary layer of the wall is simplified in this research. Combined with the boundary conditions, the relationship between the wall pressure gradient and the velocity gradient near the wall is obtained, therefore the roof pressure characteristics and the location of the separation point are analyzed. The rigid model of low-rise building with flat roof was fabricated. The combination of wind tunnel test and theory is utilized to analyze the distribution characteristics of roof pressure. The suction device is designed to complete the wind tunnel pressure test of the low-rise building model under active suction. The influence of the suction position on the roof wind pressure is studied, and the mechanism of the suction-to-wall turbulence control is proposed. Research results show that the arrangement of the suction device in the separation bubble area has a significant influence on the average wind pressure coefficient of the roof, which can greatly reduce the suction of the roof.