风障对高速公路桥梁段和路堤段区域气流场的影响
发布时间：2018-11-13 13:58
【摘要】：本论文研究的内容属于国家自然科学基金项目—“高速公路建设对区域气流场影响的研究”(51178033)的一部分。随着国家高速公路网的完善,作为防止车辆受强侧风作用侧翻的重要设施——风障近年来逐步受到重视。高速公路及其行驶的车流改变了所在区域原有相对稳定的气流场。随着风障的投入使用,使原本复杂的周边气流场分布变得更为复杂。外来气流如机动车尾气、扬尘等污染物在复杂的气流场中的扩散变得更加不可预知。不同类型的风障的减风作用和对所在区域气流场的影响又不相同。因此,研究风障对高速公路桥梁段和路堤段区域气流场的影响很有意义。 本文主要的研究内容有： (1)按照相关规范要求建立高速公路路堤和桥梁计算模型。考虑计算域尺寸、网格划分方式、边界条件、方程离散格式、选取的湍流模型、结果收敛条件等因素建立高速公路桥梁段和路堤段区域流场计算模型。 (2)高速公路桥梁段区域气流场的模拟和数值计算。采用动网格方法模拟车辆行驶过程,分析了车辆行驶对无风障时桥梁区域气流场的影响、不同透风率的风障对桥梁区域气流场的影响、不同高度的风障对桥梁区域气流场的影响。 (3)高速公路路堤段区域气流场的模拟和数值计算。采用动网格方法模拟车辆行驶过程,分析了不同高度的风障对公路路堤区域气流场的影响、不同透风率的风障对公路路堤区域气流场的影响。 本文的研究工作将为高速公路桥梁段和路堤段选取风障参数及研究使用风障后的区域气流场变化提供参考。
[Abstract]:The content of this paper is a part of the project of National Natural Science Foundation, "the influence of highway construction on regional airflow field" (51178033). With the improvement of national highway network, wind barrier, as an important facility to prevent vehicles from overturning by strong crosswind, has been paid more and more attention in recent years. The freeway and its traffic flow change the original relatively stable airflow field in the area. With the application of wind barrier, the distribution of airflow field around the original complex becomes more complicated. The diffusion of pollutants such as motor vehicle exhaust, dust and other pollutants in complex airflow field becomes more unpredictable. The effects of different types of wind barriers on the regional airflow field are different. Therefore, it is significant to study the influence of wind barrier on the airflow field of highway bridge and embankment. The main research contents of this paper are as follows: (1) the calculation model of expressway embankment and bridge is established according to relevant specifications. Considering the dimension of calculation domain, grid division, boundary condition, discrete scheme of equation, selected turbulence model and convergence condition of the result, the flow field calculation model of highway bridge and embankment region is established. (2) Simulation and numerical calculation of airflow field in highway bridge section. The moving grid method is used to simulate the driving process of the vehicle. The influence of the vehicle driving on the flow field in the bridge area without wind barrier is analyzed, and the influence of the wind barrier with different air permeability on the air flow field in the bridge area is analyzed. The influence of wind barrier at different heights on the airflow field in bridge area. (3) Simulation and numerical calculation of airflow field in expressway embankment region. The moving grid method is used to simulate the driving process of the vehicle. The influence of wind barrier at different heights on the air flow field in the embankment area and the influence of the wind barrier with different air permeability on the air flow field in the embankment area are analyzed. The research work in this paper will provide a reference for the selection of wind barrier parameters in the bridge section and embankment section of the expressway and the study of the regional air flow field changes after the use of the wind barrier.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：O35;U417
本文编号：2329344
[Abstract]:The content of this paper is a part of the project of National Natural Science Foundation, "the influence of highway construction on regional airflow field" (51178033). With the improvement of national highway network, wind barrier, as an important facility to prevent vehicles from overturning by strong crosswind, has been paid more and more attention in recent years. The freeway and its traffic flow change the original relatively stable airflow field in the area. With the application of wind barrier, the distribution of airflow field around the original complex becomes more complicated. The diffusion of pollutants such as motor vehicle exhaust, dust and other pollutants in complex airflow field becomes more unpredictable. The effects of different types of wind barriers on the regional airflow field are different. Therefore, it is significant to study the influence of wind barrier on the airflow field of highway bridge and embankment. The main research contents of this paper are as follows: (1) the calculation model of expressway embankment and bridge is established according to relevant specifications. Considering the dimension of calculation domain, grid division, boundary condition, discrete scheme of equation, selected turbulence model and convergence condition of the result, the flow field calculation model of highway bridge and embankment region is established. (2) Simulation and numerical calculation of airflow field in highway bridge section. The moving grid method is used to simulate the driving process of the vehicle. The influence of the vehicle driving on the flow field in the bridge area without wind barrier is analyzed, and the influence of the wind barrier with different air permeability on the air flow field in the bridge area is analyzed. The influence of wind barrier at different heights on the airflow field in bridge area. (3) Simulation and numerical calculation of airflow field in expressway embankment region. The moving grid method is used to simulate the driving process of the vehicle. The influence of wind barrier at different heights on the air flow field in the embankment area and the influence of the wind barrier with different air permeability on the air flow field in the embankment area are analyzed. The research work in this paper will provide a reference for the selection of wind barrier parameters in the bridge section and embankment section of the expressway and the study of the regional air flow field changes after the use of the wind barrier.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：O35;U417
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