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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Civil Engineering     
Influence of diversion device on unsteady aerodynamic performance of pantograph
NIU Ji-qiang, ZHOU Dan, LIANG Xi-feng, JIA Li-rong
Key Laboratory of Traffic Safety on Track, Ministry of Education, Central South University, Changsha 410075, China
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Abstract  

Unsteady aerodynamic characteristics of train with different diversion devices were simulated by delayed detached eddy simulation (DDES) method based on Spalart-Allmaras (S-A) turbulence model. Both the unsteady aerodynamic force of each pantograph components and its fluctuation characteristic were compared and analyzed. The numerical calculation method was verified by wind tunnel test. Results showed that both pantograph surface pressure distribution and flow structure around pantograph were significantly affected by bath typed diversion devices. The unsteady drag coefficient of pantograph and its spectral characteristics were improved by wing plate typed diversion device for the case of no sideslip angle. Aerodynamic performance of pantograph components was worsened by diversion devices for the case of sideslip angle. Lift force direction of some pantograph components was changed by sideslip angle. There were obvious differences among the effect of different diversion devices on lift of pantograph components. Some differences were found in the effect of different diversion devices on spectral characteristics of pantograph components, and the inappropriate diversion device would aggravate the fluctuation of the pantograph. The wing plate typed diversion device decreased the fluctuation of the aerodynamic force of the pantograph.

Published: 25 April 2017
CLC:  U 266  
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NIU Ji-qiang, ZHOU Dan, LIANG Xi-feng, JIA Li-rong. Influence of diversion device on unsteady aerodynamic performance of pantograph. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(4): 752-760.


导流装置对受电弓非定常气动特性的影响

采用基于Spalart-Allmaras（S-A）湍流模型的延时分离涡方法（DDES）对不同形式导流装置的列车非定常气动特性进行模拟,对比分析不同导流装置下受电弓各构件非定常气动力及波动特性,该算法经过了风洞验证.研究结果表明,浴盆式导流装置显著影响了受电弓及周围流场结构.无侧滑角时,翼板式改善了受电弓阻力系数及波动特性；存在侧滑角时,导流装置会恶化受电弓各构件的气动性能.侧滑角改变了受电弓部分构件的升力方向,导流装置在改变受电弓各构件升力效果方面差异明显.导流装置在改变受电弓各构件气动力频谱特性方面存在明显差异,不合适的导流装置会加剧受电弓气动力波动,而翼板式导流装置对受电弓气动力波动强度有相对较好的改善作用.

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