發(fā)布時間：2018-11-13 13:58

【摘要】：本論文研究的內容屬于國家自然科學基金項目—“高速公路建設對區(qū)域氣流場影響的研究”(51178033)的一部分。隨著國家高速公路網(wǎng)的完善,作為防止車輛受強側風作用側翻的重要設施——風障近年來逐步受到重視。高速公路及其行駛的車流改變了所在區(qū)域原有相對穩(wěn)定的氣流場。隨著風障的投入使用,使原本復雜的周邊氣流場分布變得更為復雜。外來氣流如機動車尾氣、揚塵等污染物在復雜的氣流場中的擴散變得更加不可預知。不同類型的風障的減風作用和對所在區(qū)域氣流場的影響又不相同。因此,研究風障對高速公路橋梁段和路堤段區(qū)域氣流場的影響很有意義。 本文主要的研究內容有： (1)按照相關規(guī)范要求建立高速公路路堤和橋梁計算模型�？紤]計算域尺寸、網(wǎng)格劃分方式、邊界條件、方程離散格式、選取的湍流模型、結果收斂條件等因素建立高速公路橋梁段和路堤段區(qū)域流場計算模型。 (2)高速公路橋梁段區(qū)域氣流場的模擬和數(shù)值計算。采用動網(wǎng)格方法模擬車輛行駛過程,分析了車輛行駛對無風障時橋梁區(qū)域氣流場的影響、不同透風率的風障對橋梁區(qū)域氣流場的影響、不同高度的風障對橋梁區(qū)域氣流場的影響。 (3)高速公路路堤段區(qū)域氣流場的模擬和數(shù)值計算。采用動網(wǎng)格方法模擬車輛行駛過程,分析了不同高度的風障對公路路堤區(qū)域氣流場的影響、不同透風率的風障對公路路堤區(qū)域氣流場的影響。 本文的研究工作將為高速公路橋梁段和路堤段選取風障參數(shù)及研究使用風障后的區(qū)域氣流場變化提供參考。
[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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：O35;U417

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本文編號：2329344