Calculation of aerodynamic coefficient and windage of hard jumper considering wind attack angle

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (13) : 1-8.

SHEN Guohui¹, ZHANG Shuaiguang¹, LOU Wenjuan¹, WANG Yiwen², SONG Gang²

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Abstract

Wind tunnel tests and finite element method were used to study aerodynamic coefficient and windage of hard jumper under different wind attack angles. Variation characteristics of drag coefficient and lift one of hard jumpers with varying of wind speed and wind attack angle were analyzed. The recommended values of aerodynamic coefficient of hard jumper under different wind attack angles were given, and the windage calculation method for hard jumper system considering effects of mountain wind field was proposed. The study showed that drag coefficient of hard jumper decreases with increase in wind speed, while its lift coefficient is basically unchanged under high wind speed; drag coefficients of hard jumpers of squirrel-cage types with 2-split, 4-split, 6-split, 8-split and aluminum tube type under wind attack angles with the most significant shielding effect decrease by 53.4%, 27.4%, 25.1%, 16.7% and 57.4%, respectively compared with their maximum values; all kinds of hard jumpers have larger lift coefficients under the specific wind attack angle; the recommended values of drag coefficients and lift coefficients of various hard jumpers under different wind attack angles were given, the maximum value of drag coefficient can be taken as 1.17; the horizontal wind acceleration effect and wind attack angle have larger influences on windage response of hard jumper, increase in windage at mountain top position is the most significant.

Key words

hard jumper / wind tunnel test / windage response / drag coefficient / lift coefficient

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SHEN Guohui, ZHANG Shuaiguang1, LOU Wenjuan1, WANG Yiwen2, SONG Gang2. Calculation of aerodynamic coefficient and windage of hard jumper considering wind attack angle[J]. Journal of Vibration and Shock, 2021, 40(13): 1-8

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