强风下车—桥系统气动特性及挡风墙的影响风洞试验研究

发布时间：2018-06-03 16:36

本文选题：车-桥系统 + 测压试验　；参考：《中南大学》2014年硕士论文

【摘要】：运行于桥梁上的高速列车改变了车桥断面的气动绕流,使车-桥系统处于更为不利的风环境之中,车-桥系统气动特性及挡风墙影响的研究对保障列车安全运行及桥梁可靠服役具有十分重要的意义。在国家自然科学基金项目(51178471、51322808)的资助下,本文以缩尺比为1：25的CRH2型高速列车、京沪高铁32m简支梁桥及双侧透风式挡风墙为试验模型,依托中南大学风洞试验系统,对车-桥系统间气动特性的相互干扰及挡风墙的影响进行了风洞测压试验研究。全文内容概括如下： (1)对风洞试验的基本原理进行阐述,给出本文试验列车、简支梁、挡风墙的尺寸参数及车、桥测点布置,对本文试验方法和数据处理原理进行论述。 (2)对列车进行了风洞测压、测力两种试验方法所得结果的对比,验证了测压方法的准确性及精度,证明了用风洞测压方法研究车、桥气动特性具有可行性。研究了两车、三车试验模型对测试结果的影响,结果表明两种模型组合均能满足试验要求。在横向来流作用下,对桥梁纵、横向不同位置的列车进行了测压试验,研究单车、双车与桥梁组合状态下桥梁位置及挡风墙高度、透风率等对列车气动特性的影响,并选择了合理的挡风墙高度。 (3)对侧向来流作用下的车-桥系统进行了测压试验,研究列车气动特性的雷诺数效应、车-桥系统气动特性的相互干扰及挡风墙对车-桥系统气动特性的影响。
[Abstract]:The high-speed train running on the bridge changes the aerodynamic flow around the cross-section of the vehicle bridge, which makes the vehicle-bridge system in a more unfavorable wind environment. The study of aerodynamic characteristics of vehicle-bridge system and the influence of windshield wall is of great significance to ensure the safe operation of trains and the reliable service of bridges. Supported by the project of National Natural Science Foundation of China 51178471( 51322808), this paper takes the CRH2 high-speed train with a scale ratio of 1:25, the 32m simply supported beam bridge of Beijing-Shanghai high-speed railway and the double-side ventilated windshield wall as the test model, and relies on the wind tunnel test system of Central South University. The wind tunnel pressure measurement experiment was carried out to study the interaction of aerodynamic characteristics between vehicle and bridge system and the influence of windshield wall. The full text is summarized as follows: 1) the basic principle of wind tunnel test is expounded, the dimension parameters of train, simply supported beam, windshield wall and the arrangement of measuring points of bridge are given, and the test method and data processing principle in this paper are discussed. 2) the results of wind tunnel pressure measurement and force measurement are compared, the accuracy and accuracy of the pressure measurement method are verified, and the feasibility of using the wind tunnel pressure measurement method to study the aerodynamic characteristics of the vehicle and bridge is proved. The effects of two and three vehicle test models on the test results are studied. The results show that the two models can meet the test requirements. Under the action of lateral flow, the influence of bridge position, windshield height and air permeability on the aerodynamic characteristics of the train was studied under the condition of bridge longitudinal and lateral train pressure measurement at different positions, single cycle, double car and bridge combination, and the influence of the bridge position, the height of the windshield wall and the air permeability on the aerodynamic characteristics of the train. The reasonable height of the windshield wall is selected. In this paper, the pressure test of vehicle-bridge system under the action of lateral flow is carried out to study the Reynolds number effect of train aerodynamic characteristics, the mutual interference of vehicle-bridge system aerodynamic characteristics and the influence of windshield wall on the aerodynamic characteristics of vehicle-bridge system.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U270.11

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