摘要
基于同步测压技术,以京沪高速铁路典型高架桥和CRH2列车为背景,研究风屏障对典型车桥组合状态下列车的风压分布和各面气动力分布特征的影响,以分析风屏障的气动影响机理,并从流体力学角度进行解释。研究结果表明:风屏障对上游列车气动特性影响较大,下游列车由于处于尾流中,受之影响较小;设置风屏障后,上游列车由于迎风面风压由正变负,使得该面的侧力与背风面相反,故使总体侧力减小,车顶平均风压显著减小,使得车顶升力约增大50%,背风面和车底风压变化较小;风屏障透风率及高度取值需根据具体环境进行优化,并需注意防风效果并不与减小平均风速等同。
Abstract
Based on the simultaneous pressure measurement, models of CRH2 type train and 32m pre-stressed concrete simply supported box beam viaduct at Beijing-Shanghai high-speed rail line are manufactured with geometric scale of 1:25, the influence of wind barrier on aerodynamic forces of each face and pressure distribution for vehicle under representative combination cases of model vehicles on double tracks on the model viaduct are investigated, according to which the aerodynamic influence mechanism of wind barrier can be analyzed, and the mechanism is interpreted from the perspective of hydrodynamics. Results show that the influence of wind barrier on the aerodynamic characteristics of upstream vehicle is significant, while the downstream vehicle is less affected because of it is in the wake. After the wind barrier are installed, the wind pressure on the windward side of upstream vehicle changes from positive to negative, which result in that the direction of lateral force on the windward side is opposite to that on leeward side, making the overall lateral force decreases. The lift on the roof increases about 50% because of the mean wind pressure decreases significantly, while the pressure on both the leeward side and underbody change slightly. Both porosity and height of wind barrier need to be optimized according to the specific environment, and people should pay attention to that windbreak effect is not equal to reduce the mean wind speed.
关键词
风屏障 /
车桥组合 /
气动特性 /
风洞试验
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Key words
wind barrier /
combination of vehicle and bridge /
aerodynamic characteristic /
wind tunnel test
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何旭辉;邹云峰;杜风宇.
风屏障对高架桥上列车气动特性影响机理分析[J]. 振动与冲击, 2015, 34(3): 66-71
HE Xu-hui;ZOU Yun-feng;DU Feng-yu.
Mechanism analysis of wind barrier on aerodynamic characteristics influence of the train on viaduct[J]. Journal of Vibration and Shock, 2015, 34(3): 66-71
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脚注
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