抄録
The turbo-jav is a flying object used in the javelic throw in the junior Olympic games. In order to investigate the aerodynamic characteristics of the turbo-jav, we measured the drag force, lift force and pitching moment which act on the turbo-jav in a low speed wind tunnel at the flow speed up to 25 m/s. Test results show that the obtained drag coefficient, lift coefficient and moment coefficient are almost constant irrespective of the Reynolds number when the flow speed is larger than about 12.5 m/s. The dependence of these coefficients on the angle of attack is examined closely. By the use of these obtained coefficients, we have made a numerical simulation of the flight of the turbo-jav at various initial conditions corresponding to throwing experiments. The trajectories of the turbo-jav predicted by the numerical simulation were found to be comparable to those of the throwing experiments.
