If you kick the ball hard enough for the airflow over the surface to become turbulent, then the drag force remains small and the ball will really fly.
如果你踢球的力量足够大，使得球表面的气流形成湍流，则阻力会很小，你很可能踢成高射炮。
2
However, when the airflow is turbulent, the boundary layer sticks to the ball for longer.
然而，当气流为湍流时，边界层维持时间较长。
3
According to the law of conservation in the state of turbulent flow, the differential equation describing the airflow temperature distribution in drifting tunnel is derived.