邓锷,杨伟超,尹荣申,张平平.横风下高速列车驶入隧道时瞬态气动性能研究[J].湖南大学学报:自然科学版,2019,(9):69~78
横风下高速列车驶入隧道时瞬态气动性能研究
Study on Transient Aerodynamic Performance of High-speed Trains when Entering into Tunnel under Crosswinds
  
DOI:
中文关键词:  隧道  横风  高速列车  气动荷载  瞬变效应
英文关键词:tunnel  crosswind  high-speed train (HST)  aerodynamic load  transient change effect
基金项目:
作者单位
邓锷,杨伟超,尹荣申,张平平 (中南大学 土木工程学院湖南 长沙 410075) 
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中文摘要:
      针对列车高速驶入隧道时流场的三维、非定常及可压缩湍流等特性,建立了精细化的隧道-列车-空气三维CFD数值模型,对比分析洞口有无横风条件下列车驶入隧道过程中车体周边的瞬态流场结构、压力分布,并研究横风条件下车体的5项气动荷载(气动横向力、气动升力、倾覆力矩、偏航力矩和点头力矩)指标的瞬变特性以及风速和车速变化对其最大瞬变幅值的影响情况.研究结果表明:当列车在横风环境下驶入隧道,洞外部分车体两侧流场结构和压力分布差异显著,而洞内部分差异较小,从而引发列车进洞前后车体压差突变;列车在进洞过程中,车体的各项气动荷载均存在瞬变效应,且尾车同时呈现出倾覆、“上跳”、“蛇形”摆动以及“点头”等行为;风速变化对尾车偏航力矩变化幅值影响较显著,而车速变化对头车偏航力矩变化幅值影响较显著.
英文摘要:
      Considering the three dimensional unsteady compressible turbulent characteristics of the flow field when a high-speed train (HST) enters the tunnel, a refined 3D CFD numerical model of tunnel-train-air was built to analyze the transient flow field structure and pressure distribution in the process of HST entering into tunnel under the conditions of crosswind and without crosswind comparatively. The transient change characteristics of the five aerodynamic loads (i.e. aerodynamic side force, lift force, rolling moment, yawing moment and nodding moment) of the train body under crosswind and the influence of wind and vehicle speeds on its maximum variation amplitudes were studied. The main results can be summarized as follow: When a HST enters into tunnel under crosswind environment, flow field structure and pressure distribution on both sides of the train body outside the tunnel have an obvious dissimilarity, and it's smaller inside the tunnel, which causes the sudden change of the train body pressure difference before and after the HST entering the tunnel. In the process of HST entering the tunnel, there are transient change effects in various aerodynamic loads of the train body, and the tail carriage presents capsizing,“jumping”,“snake-like” swing and “nodding” behavior at the same time. The change of the wind speed has a significant effect on the variation amplitude of the tail carriage yawing moment, while the change of the train speed has a significant effect on the variation amplitude of the head carriage yawing moment.
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