Influence of Height of Dome on Aerodynamic Characteristics of Pantograph under Cross Wind
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摘要: 建立接触网-受电弓-导流罩-列车整体模型，基于分离涡模拟方法，研究了橫风作用时不同导流罩高度下受电弓非定常气动特性，分析了涡量、流线、气动荷载等的变化规律。结果表明：导流罩高度为100 mm时分离涡向橫风背风侧偏转显著，导流罩高度增加为400 mm时对受电弓下部杆件、车体连接处等作用增强；导流罩高度为200 mm时横风作用产生的绕流场偏转的效应明显得到改善，流场分布在纵向呈较好的对称性，其阻力系数的增幅远小于受电弓所受横向力的降幅，同时大幅降低了倾覆力矩和侧偏力矩，故在恶劣的风环境下采用200 mm高度的导流罩是可取的。研究结果对横风作用下导流罩高度对受电弓气动特性的影响研究具有重要意义。Abstract: The whole model of catenary-pantograph-shroud-train is established. Based on the method of separated vortex simulation, the unsteady aerodynamic characteristics of the pantograph with different height shroud under the action of cross wind are studied, and the variation laws of vorticity, streamline and aerodynamic load are analyzed. The simulation results show that when the height of the shroud is 100 mm, the separation vortices deflect significantly to the leeward side of the crosswind; and when the height of the shroud is 400 mm, the effects on the lower bars of the pantograph and the joints of the car body are enhanced; when the height of the shroud is 200 mm, the effect of the crosswind on the deflection of the flow field is obviously improved, and the distribution of the flow field is symmetrical in the longitudinal direction, and the increase of the resistance coefficient is much smaller than that of the pantograph. The reduction of the transverse force on the pantograph greatly reduces the overturning moment and the side deflection moment, so it is advisable to use a 200 mm height deflector in the harsh wind environment. These results are significant to the study of the influence of the shroud height on the aerodynamic characteristics of the pantograph under cross wind action.
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Key words:
- high-speed train pantograph /
- shroud /
- crosswind /
- flow field /
- separated vortex simulation
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表 1 100 mm和200 mm导流罩各参数比较
高度/mm Cx Cz Cy Mx Mz My 100 平均值 0.816 0.578 0.410 0.554 0.651 0.758 最大值 0.994 0.762 1.131 1.021 1.880 1.335 最小值 0.647 0.169 0.437 0.437 0.623 0.521 平均振幅 0.082 0.109 0.068 0.062 0.116 0.791 200 平均值 0.830 0.500 0.049 0.042 0.890 0.124 最大值 1.335 0.652 0.072 0.051 1.192 0.176 最小值 0.658 0.385 0.031 0.031 0.073 0.023 平均振幅 0.106 0.049 0.011 0.006 0.093 0.026 
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