Downburst outflow under different angles of jet tilt based on physical simulation

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (11) : 215-222.

LI Bo1,2, LI Ruoqi1, TIAN Yuji1,2, LI Peng1, YANG Qingshan2,3

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Abstract

The downburst wind field is generated by physical simulator, and the effects of jet tilt on the characteristics of downburst including the wind speeds and pressure are studied. The results show that the downburst wind field has both horizontal and vertical wind. When the jet tilt exists, the downburst wind field no longer presents symmetry. The peak value of vertical wind velocity on the rear side of the jet outflow is greater than that on the forward side, and the vertical wind velocity on the rear side increases with the increase of angle of jet tilt. When the angle of jet tilt reaches 20°, the vertical wind velocity on the rear side can be increased by 67% compared with that without jet tilt. The peak value of horizontal wind velocity on the forward side is greater than that on the rear side, and the horizontal wind velocity on the forward side increases slightly with the increase of the angle of jet tilt. When the angle of jet tilt reaches 20°, the horizontal wind velocity on the forward side can be increased by 50% at most compared with that without jet tilt, and the peak value of the rear side decreases rapidly. The pressure in the area below the outflow increases with the jet tilt, and the other positions are not affected by the jet tilt.

Key words

downburst / physical simulation / jet tilt / horizontal speed / vertical speed / pressure

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LI Bo1,2, LI Ruoqi1, TIAN Yuji1,2, LI Peng1, YANG Qingshan2,3. Downburst outflow under different angles of jet tilt based on physical simulation[J]. Journal of Vibration and Shock, 2023, 42(11): 215-222

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