摘要
为了研究冰棱对覆冰导线气动力及驰振稳定性的影响。应用FLUENT中的SST k-w湍流模型对三维五冰棱覆冰导线绕流场进行数值模拟分析，将三维五冰棱覆冰导线模型沿展向方向分为5个节段，监控全攻角下节段3的阻力系数、升力系数，并分析不同风速、冰棱长度、相邻冰棱间距等对气动力参数产生的影响，根据Den Hartog理论计算得到驰振力系数，并判定覆冰导线的振稳定性。结果表明：冰棱覆冰导线形态对覆冰导线流体绕流特性有极大的影响，其绕流场呈现明显的周期性；冰棱覆冰导线气动力参数受风攻角影响较大，阻力系数最大值与最小值相差2.55，升力系数最大值与最小值相差5.83；风速、冰棱长度、相邻冰棱间距等因素对冰棱覆冰导线气动力参数影响有限；覆冰导线部分驰振力系数小于零（＜0），冰棱覆冰导线处于非稳定状态，冰棱覆冰导线出现驰振舞动概率极大。
Abstract
Here, to study influences of ice crystal on aerodynamic force and galloping stability of iced conductor, the SST k-w turbulence model in the software FLUENT was used to simulate the flow field around a 3-D iced conductor with 5icicles. The 3-D iced conductor model with 5icicles was divided into 5 segments along its spanwise direction. The drag coefficient and lift coefficient of segment 3 at full wind attackangle were monitored. The influences of wind speed, length of icicle and distance between adjacent icicles on aerodynamic parameters of the conductorwere analyzed. Galloping force coefficient was calculated according to Den Hartog theory, and the vibration stability of the iced conductor was determined.Results showed that the shape of the iced conductor has a great influence on characteristics of fluid flow around it, and the flow field around itis obviously periodic; aerodynamic parameters of the iced conductor are more largely affected by wind attack angle, the difference between the maximum and minimum drag coefficient is 2.55, and the difference between the maximum and minimum lift coefficient is 5.83; wind speed, icicle length and distance between adjacent icicles have limited influence on aerodynamic parameters of the iced conductor; galloping force coefficient forparts of the iced conductor is less than zero (<0), the iced conductor is in an unstable state, and its galloping probability is very high.
关键词
冰棱 /
覆冰导线 /
气动力 /
舞动
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Key words
ice crystal /
iced conductor /
aerodynamic force /
galloping
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祝贺，王刚，郭鑫.
冰棱对三维覆冰导线气动力特性影响研究[J]. 振动与冲击, 2021, 40(1): 212-217
ZHU He, WANG Gang, GUO Xin.
Influences of ice crystal on aerodynamic characteristics of a 3D iced conductor[J]. Journal of Vibration and Shock, 2021, 40(1): 212-217
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