風洞実験における低流速測定を目的としたリング流速計の試作 : 流体工学,流体機械

概要

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A vortex anemometer measures the free stream velocity U utilizing the fact that vortex shedding frequency f_v is nearly proportional to the velocity U. In this work, In order to enable to apply it to the low velocity range in wind tunnel experiments, a vortex anemometer was devised using a ring as the vortex generating bluff body. A wind tunnel and a water tunnel were used to obtain the relationship between the Strouhal number St and Reynolds number Re. Results of water tunnel and wind tunnel experiments correlated well and gave a function St(Re) in an extensive Re range. Experiments using three rings with geometrically similar configurations to the prototype ring mentioned above, but with different dimensions, showed universality of the function St(Re). A function for the relationship between f_v and U is proposed from the function St(Re), so that the ring-type anemometer has a higher reliability in a low velocity range where the Pitot-static tube and a manometer system can not be applied. Since it has a very simple configuration, the size can be made small enough to be an alternative of a standard Pitot-static tube.
一般社団法人日本機械学会の論文
2001-05-25