ターボジャブの空力特性の計測

（軸回り回転が与える影響）

抄録

The “turbo-jav” is used for the javelic throw in the Junior Olympic Games and in the National Sports Festival for People with Disabilities. To improve the record in these flowing events, it is important to elucidate the flight characteristics of the turbo-jav. We have measured the aerodynamic characteristics of the turbo-jav in the wind tunnel tests at the wind speed U up to 25 m/s for various angles of attack α. In the present study, we report the drag coefficient, the lift coefficient and the pitching moment coefficient for the turbo-jav thus obtained for 0 ≤ α ≤ 25 o, as well as our recent measurements in support interface free by the Magnetic Suspension and Balance System (MSBS) at Tohoku University for 10 ≤ U ≤ 40 m/s at small α (-5 o ≤ α ≤ 5 o). We also present the wind tunnel tests for the rolling turbo-jav model at the frequency of 0 to 20 rps. It was found that the obtained aerodynamic coefficients oscillate in time but their averaged values are almost independent of the rolling frequency.