磁力支持天秤装置を用いたターボジャブの空力特性計測

抄録

The aerodynamic coefficients of the turbo-jav (a short javelin for junior or disabled athletes) up to 26 degree angle of attack were obtained using Magnetic Suspension and Balance System (MSBS). Ordinary thin models are susceptible to interference caused by mechanical supports. However, MSBS can eliminate the support interference because the model is floating supported by magnetic force instead of mechanical supports. Drag, lift force and pitching moment coefficients were measured in the wind tunnel tests at the wind speed 25 m/s (Re = 6.4 × 10⁴) from 0 to 26 degrees angle of attack. This experiment agreed well with the results of the calculation using ANSYS FLUENT. Especially for pitching moments, the present measurement agreed the calculation better than the previous results using mechanical supports. It suggested that the results using MSBS was more reliable. In addition, the experimental results suggested that the aerodynamic characteristics of the turbo-jav depended on the fins of the turbo-jav but not on the rotation angle around air flow axis of the turbo-jav.