Trial manufacture of an inscribed 240 polyhedron type dynamic atmospheric pressure sensor in the planetary boundary layer

行星边界层内接240多面体型动态大气压力传感器的试制

• 批准号: 09650625
• 负责人: KATSURA Junji
• 金额: $ 1.22万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650625/
• 关键词: atmospheric pressure; planetary boundary layer; natural wind; atmospheric turbulence; quasi-steady; wind pressure measurement; 気圧変動; 気圧計測; 乱流スケール; 流形形成長さ

A hollow globe with small protuberances and holes on the surface acts as a dynamic pressure sensor by measuring the wind force and does as a reference pressure sensor by modifing the intenal pressure. On the surface of globe there are 361 holes at the center of each protuberance which is evenly arranged in accordance with the geometric position of the 122 vertexes (including one for conducting tube) and the 240 triangle gravity centers of the inscribed 240 polyhedron.The internal pressure of the hollow globe evenly perforated was successfully divided into the approaching wind effect and the reference atmospheric pressure, utilizing the omnidirectionality for the internal pressure and the drag force against wind direction change. The 300 times scale ratio of the globe size to the length scale of turbulence kept a quasi-steady state, and so a uniform stream in a wind tunnel was available to measuring the pressure and drag coefficients. Although the apparatus had a small defect for the measurement of the drag force, it worked well under the limited conditions of the horizontal dynamic pressure and a long duration of time. It was found that the reference pressure fluctuation during several minutes was often stronger in the test field than that of the wind pressure.The result of the research is presented at the 10 th International Conference on Wind Engineering held in Copenhagen with the title "On a reference pressure detecter and an example of field data in a natural wind".

利用空心地球仪作为动态压力传感器，通过改变球内压力来实现参考压力传感器的功能。在地球仪的表面上，每个凸起的中心有361个孔，这些孔按照122个顶点的几何位置均匀地排列（包括导管）和内接240多面体的240三角形重心，成功地将均匀开孔空心地球仪的内压分解为逼近风效应和参考大气压力，利用内压的全方位性和阻力对抗风向变化。地球仪的尺度与湍流长度尺度的300倍比例尺保持准稳态，因此风洞中的均匀流可用于测量压力和阻力系数。虽然该装置在拖曳力测量方面存在一定的缺陷，但在水平动压和长时间的限制条件下，仍能正常工作。在哥本哈根举行的第10届国际风工程会议上，以“在自然风中的参考压力探测器和现场数据的例子”为题，介绍了这一研究结果。