稳态下击暴流风场竖向空间相关性试验研究

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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 speed under different radial positions, vertical distances, terrain conditions and jet velocities was 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, and the maximum correlation coefficient appears near r=1.0Djet, 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 is established, which is in good agreement with the experimental wind field.

Key words： downburst impinging jet horizontal wind speed correlation coefficient coherence function

Received: 31 July 2023 Published: 28 May 2024

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I10/230

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