风洞短试验段中基于被动技术的大气边界层模拟

针对西南交通大学XNJD-1风洞第一试验段的特点,采用被动模拟装置,通过多次流场校测、反复试凑,成功地在风洞中模拟了C类地表情况下的高湍流度大气边界层,实测平均风速剖面、湍流度剖面及风谱特性等与目标值较为吻合.此外,还对比讨论了平均风速和离地高度等因素对风场特性影响, 并计算了湍流积分尺度.研究表明边界层调试过程中应重点考查气流在对应结构卓越频段范围内的脉动情况,而仅将湍流度作为参考指标.

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.