In order to consider the trajectory of the Turbojav, a wind tunnel test was performed using Magnetic Suspension and Balance System (MSBS), and the longitudinal three-component force was measured. The flight trajectory of the Turbojav was calculated from the measured aerodynamic force, and the throwing conditions were optimized using NSGA-II. It was found that the point where the flight distance of the Turbojav strongly depends on the initial speed and the point where the optimum release angle is around 40 deg are similar to those of the competition spear. On the other hand, the Turbojav had a large pitching moment, so the angle of attack during flight tended to converge to 0 deg, and it was found that the flying distance was less affected by the initial angle of attack compared to the competition spear. Based on these facts, in the Turbojav practice, the main focus should be to provide a larger initial velocity at a projection angle near 40 deg, and by throwing consciously at an angle of attack near 0 deg, the flight distance will be maximized. It can be a useful exercise for the Javelin sport as well.
抄録全体を表示