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通过刚性模型风洞测压试验,研究了风向沿马鞍低点连线时菱形马鞍屋盖表面的风压特性.首先给出了屋盖表面的平均及脉动风压分布,通过脉动风压谱,从微观角度阐述了迎风前缘附近旋涡从生成、发展直到最后破裂的过程,进而解释了迎风前缘易损区域的平均及脉动风压分布机理.分析马鞍高点附近的风压谱形状,发现结构对于来流的干扰作用在风压脉动上体现为高频脉动.此后用测点风压时程的三、四阶矩对风压的非高斯特性进行描述并给出了划分高斯、非高斯区的标准,在此基础上对马鞍屋盖表面进行了分区.通过研究脉动风压谱,发现风压非高斯特性是由于来流的分离运动及结构对来流的干扰作用引起的,且前者引起的非高斯特性较后者更为显著.
Through the wind tunnel pressure measurement test, the wind pressure characteristics of diamond saddle roof surface when the wind direction is connected along the saddle low point are studied.At first, the distribution of average and fluctuating wind pressure on roof surface is given, From the microscopic point of view, the process of vortices from the formation and development to the final rupture near the front of the forward windward is explained, and then the mean and fluctuating wind pressure distributions in the vulnerable area of the forward windward are explained. The interference of the structure to the incoming flow is reflected in the pulsation of the pressure pulsation, and then the non-Gaussian characteristics of the air pressure are described by the moments of third and fourth moments of the measuring pressure time of the measuring point. Area standard, and then the surface of the saddle roof is zoned.By studying the fluctuating wind pressure spectrum, it is found that the non-Gaussian wind pressure is caused by the isolated movement of the incoming stream and the disturbance of the structure to the incoming stream, and the former The resulting non-Gaussian characteristics are more significant than the latter.