大气边界层风场的风洞模拟

发布时间：2018-04-25 09:13

本文选题：大气边界层 + 风洞　；参考：《北京交通大学》2013年硕士论文

【摘要】：在风洞中正确模拟大气边界层的流场特性,是风洞实验结果可信的必要条件,也是风工程研究的重要前期工作。北京交通大学风洞实验室目前已经建成,在实验室中正确的模拟出大气边界层的特性势在必行。风洞中模拟大气边界层的方法有主动模拟方法和被动模拟方法两种。主动模拟方法有振动翼栅、多风扇风洞等。尖劈—粗糙元被动模拟技术是目前大气边界层风洞模拟使用的主要技术,得益于其取材方便、使用方便和经济的特点。本文通过研究整理大气边界层的模拟技术的相关理论资料并实践,采用尖劈—粗糙元模拟技术模拟出了规范中规定的四类地貌。主要工作总结如下： (1)对风洞模拟实验进行了设计,包括尖劈、粗糙元和挡板的设计和加工,制定了详细的实验方案和数据处理方法。 (2)通过大量对比实验,整理出了风场模拟的基本思路和尖劈、粗糙元、挡板布置方式对风场模拟的影响机理。对风场模拟中的衰减现象、温度和采样频率等其他影响因素进行了分析研究。 (3)对湍流积分尺度计算方法和脉动风速功率谱估计方法进行了整理总结,确定了本文的所采用的计算方法,模拟了风洞风场实测结果的湍流积分尺度剖面和脉动风速功率谱。
[Abstract]:The correct simulation of the flow characteristics of the atmospheric boundary layer in the wind tunnel is a necessary condition for the experimental results of the wind tunnel. It is also an important prophase work of the wind tunnel research. The Beijing Jiaotong University wind tunnel laboratory has been built now. It is imperative to correctly simulate the characteristics of the atmospheric boundary layer in the laboratory.
There are two methods to simulate the atmospheric boundary layer in the wind tunnel. There are active simulation methods and passive simulation methods. Active simulation methods have vibratory winged grid, multi fan wind tunnel and so on. The wedge rough element passive simulation technology is the main technique used in the air boundary layer wind tunnel simulation at present, benefiting from its convenience, convenience and economy.
In this paper, through the research and practice of the relevant theoretical data of the simulation technology of the atmospheric boundary layer, the four types of geomorphology specified in the specification are simulated by the wedge - rough element simulation technology. The main work is summarized as follows:
(1) the wind tunnel simulation experiment was designed, including the design and processing of the wedge, rough element and baffle. Detailed experimental plans and data processing methods were worked out.
(2) through a large number of contrast experiments, the basic ideas of wind field simulation and the influence mechanism of the splitting, rough element and baffle layout on the wind field simulation are sorted out. The attenuation phenomena, the temperature and the sampling frequency in the wind field simulation are analyzed and studied.
(3) the calculation method of the turbulence integral scale and the estimation method of the pulsating wind power spectrum are summarized, and the calculation method used in this paper is determined. The turbulence integral scale section and the pulse wind power spectrum of the wind tunnel wind field are simulated.

【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU317;P425

【参考文献】