【作者】 宋瑞斌；

【导师】 郭文华；

【作者基本信息】 中南大学 ， 土木工程， 2011， 硕士

【摘要】 随着我国高速铁路的发展和列车车速的日益提高,列车空气动力学问题越来越受到重视。高速列车在桥梁上运行时的空气动力作用不仅是一个关系高速列车安全运行的重要工程技术问题,而且也是关系到旅客乘坐舒适性的问题,因此,研究高速列车在桥梁上运行时相互气动特性具有重要意义。针对高速列车在桥梁上运行时的气动特性问题,本论文以三维不可压缩的Navie-Stokes方程和RNGκ-ε两方程湍流模型为基础,采用有限体积法和动网格技术建立了列车空气动力学数值计算模型,综合桥梁、轨道板等因素,研究了不同风环境下列车在桥梁上运行时的相互气动特性。主要概括为以下几个方面：(1)建立高速列车——桥梁系统三维仿真模型,对比了静网格格模型和动网格模型的计算结果,二者结果相差不大,但动网格模型更加与列车实际运行相符,所以本文模拟列车运行采用动网格技术。(2)按照风洞实验的要求,利用静网格技术模拟1：20缩尺比模型下列车在不同位置时对桥梁节段的气动性能影响,总结分析其各气动系数的变化规律；此外还研究了列车在不同风偏角工况下,列车气动系数的变化规律。(3)研究列车在桥梁上运行时的相互气动特性。分别研究了列车车速和侧风风速对列车在桥梁上运行时的相互气动特性影响,同时对比了列车在迎风侧和背风侧运行时的气动力系数,研究了不同梁高对列车运行的气动性能影响,最后研究得出了列车气动力系数随风偏角的变化规律,为风作用下列车通过桥梁时的动力响应及行车安全性、舒适性研究提供基础数据。(4)研究了静风和不同侧风速度下列车等速会车时列车和桥梁的相互气动特性,总结对比了各气动力系数的变化规律和原因。更多还原

【Abstract】 With the development of high speed railway and train speed, The aerodynamic characteristics of train/vehicles are being getted increasingly serious. The aerodynamic characteristics of high speed trains on bridge become an important engineering problem not only related to running safety, but also related to passenger riding comfort of vehicles. Therefore, it is greatly significant to study the aerodynamic characteristics of vehicle and bridge when trains run on the bridge.For the issue of aerodynamic characteristics of high-speed train running on the bridge, based on 3-D steady and incompressible Navier-Stokes equation, and RNGκ-εturbulence model, this thesis establishes a dynamic simulation model of high-speed trains with the help of the Finite Volume Method(FVM) and the dynamic grid technology, then study the aerodynamic characteristics of vehicles and bridge, considering the factors of bridge and rail board. The main contents and achievements of this thesis are as follows:1.The high-speed train and bridge system dynamic model is established. Compared the result of static gird model with dynamic gird model, both results have little difference. But dynamic gird model is more consistent with the train actual operation. Therefore, the simulation method of train-bridge system model uses dynamic grid technology.2.According to the requirement of wind tunnel experiments, the aerodynamic characteristics of bridge section are calculated through simulating the scale 1:20 model using static grid technology, then this thesis summarizes and analyses the trend of change of the aerodynamic coefficients; Additional, it is also being studied the changing regularity aerodynamic coefficients of vehicles in different wind yaw angle.3.The aerodynamic characteristics of vehicle and bridge are analyzed when trains run on the bridge.the aerodynamic characteristics of each other are calculated in different train speed or crossing wind speed, meanwhile, the aerodynamic coefficients of trains located in the windward and leeward are compared and the aerodynamic characteristics of trains running in different high beam are discussed, finally, this thesis presents the changing regularity of aerodynamic coefficients of vehicles in different wind yaw angle, which can provide for the studying of dynamic responses of train moving on bridge under the crossing wind and analyzing running safety and riding comfort of vehicles.4.A simulation analyzes on the aerodynamic characteristics of each other when two high-speed trains passing each other researched by dynamic grid technology in the static wind and different velocity of crossing wind, then this thesis summarizes the changing regularity of aerodynamic coefficients of vehicles.更多还原