Boundary layer simulation in the short test section of wind tunnel by the passive method

According to the properties of the first test section of XNJD-1 wind tunnel in Southwest Jiaotong University,a boundary layer with strong turbulence was simulated in the wind tunnel for class C terrain by passive method.A series of wind tunnel tests were carried out to adjust flow field.For the final layout of boundary layer,mean wind speed profile,turbulence profile and wind spectrum agree with the required goals.The effects of mean wind speed and height on the aerodynamic characteristics of wind speed field are discussed.And the turbulence integral scale is calculated.It is noted that fluctuation of wind in structural frequency range should be paid more attention to in boundary layer simulation.And turbulence intensity should be just regarded as an overall index.