Measurement of aerodynamics forces acting on a javelin by using a magnetic suspension balance system

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  • 磁力支持天秤によるヤリの実物大模型に働く空気力の測定

Abstract

<p>Using the world’s largest 1-m MSBS (Magnetic Suspension and Balance System) and low-turbulence wind tunnel at Tohoku University, we successfully measured the aerodynamics force acting on a non-spinning women’s javelin with no supporting rod. The primary advantage of the MSBS is the complete elimination of any support, which can interference with the measurements. The advantage of the world's largest 1m-MSBS at Tohoku University is that it is possible to employ a real javelin at relatively high AoA. A women’s javelin was used for the wind tunnel tests. It was found that the drag and the Lift increase with increasing the angle of attack up to 18 °. The pitching moment increases up to about 9 °, and it decreases up to 18 °. The pitching moment becomes negative above 12 °. The nose-up rotation was determined as positive. We also confirmed the support interferences with using a pseudo supporting rod. The tip of the pseudo supporting rod was set at the distance of 2 mm away from the surface of the javelin at the angle of attack of 0 °.It was confirmed that there are some differences between the aerodynamics forces with the pseudo supporting rod and those without it. The absolute aerodynamic forces without the pseudo supporting rod become smaller.</p>

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