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1Experimental investigation of the aerodynamics of a large industrial building with parapet显示文摘The aerodynamic performance of a roof depends significantly on its shape and size,among other factors.For instance,large roofs of industrial low-rise buildings may behave differently compared to those of residential homes.The main objective of this study is to experimentally investigate how perimeter solid parapets can alter the flow pattern around a low-rise building with a large aspect ratio of width/height of about 7.6,the case of industrial buildings/shopping centers.Solid parapets of varied sizes are added to the roof and tested in an open-jet simulator in a comparative study to understand their impact on roof pressure coefficients.Roof pressures were measured in the laboratory for cases with and without parapets under different wind direction angles(representative of straight-line winds under open terrain conditions).The results show that using a parapet can alter wind pressures on large roofs.Parapets can modify the flow pattern around buildings and change the mean and peak pressures.The mean pressure pattern shows a reduction in the length of the separation bubble due to the parapet.The parapet of 14%of the building’s roof height is the most efficient at reducing mean and peak pressures compared to other parapet heights.Aly Mousaad Aly Matthew Thomas Hamzeh Gol-Zaroudi 2021Advances in Aerodynamics2021,3,1:0
2微型无人机发展现状及未来趋势显示文摘针对微型无人机的发展现状和未来趋势进行了综合评述。首先,在梳理国内外微型无人机发展现状的基础上,详细介绍了国内外微型无人机典型研究项目及研究成果。然后,从机载设备微型化、低雷诺数气动设计和复杂环境自主导航与避障技术三个方面总结了关键技术研究现状。最后,对微型无人机的未来趋势进行了展望。研究结果表明,微型无人机在机载设备微型化方面已有一定进展,但机载设备综合化和通用化程度还有待提高;在低雷诺数气动设计方面还需进一步探究微型仿生无人飞行器高升力、长续航、低噪声和跨介质飞行机制;在复杂环境自主导航与避障方面需提高算法的环境通用性和适用性。龚静 冯笛恩 夏林 2023飞行力学2023,41,5:0
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