【摘要】 为研究下击暴流水平风速的竖向相关性，采用冲击射流装置模拟了稳态下击暴流风场，测量了不同径向位置、竖向距离、地貌条件以及射流速度下的水平风速，重点分析了水平风速的竖向相关性和相干曲线，提出了稳态下击暴流风场的相干函数模型。结果表明，相关系数随径向距离的增加而先增大后减小，最大相关系数出现在r=1.0 D_jet附近，地面粗糙度和射流风速对相关系数影响较小。相干函数与测点的竖向间距密切相关，径向位置和射流风速对相干函数影响较小，地表粗糙度的增加会降低近地测点的相干性。基于试验数据，建立了稳态下击暴流竖向相干函数模型，实现了与试验风场较好的吻合。更多还原

【Abstract】 In order to study the vertical coherence of the horizontal wind speed of downburst, the steady downburst wind field was simulated using an impinging jet device, and the horizontal wind speeds related to different radial positions, vertical distances, terrain conditions and jet velocities were measured. The vertical correlation and coherence curve of the horizontal wind speed were emphatically analyzed, and the coherence function model of the steady downburst wind field was proposed. The results show that the correlation coefficient first increases and then decreases with the increase of the radial distance, the maximum correlation coefficient appears near r=1.0 D_jet, and the ground roughness and jet wind speed have little influence on the correlation coefficient. The coherence function is closely related to the vertical spacing of the measuring points, the radial position and jet wind speed have little influence on the coherence function, and the increase of the surface roughness will reduce the coherence of the near-earth measuring point pair. Based on the test data, the vertical coherence function model of the steady-state downburst was established, which is in good agreement with that of the experimental wind field.更多还原