| 释义 |
Magnus effect|ˈmægnəs ɛˈfɛkt|
[Named after Heinrich G. Magnus (1802–70), German scientist, who first described it.]
The effect of rapid spinning on a cylinder or sphere moving through a fluid in a direction at right angles to the axis of spin, which results in a sideways force at right angles to both the direction of motion and the axis of spin and towards the side where the peripheral motion of the body is in the opposite direction to its overall motion.
1921tr. Cranz & Becker's Handbk. Ballistics I. 314 A quantitative theory of the deviation of a sphere under the influence of the adhering air (Magnus effect) was attempted..by Tait. 1925Flight 8 Jan. 14/1 It does not appear to be until quite recently that the idea of applying the Magnus effect has occurred to anyone. 1943R. C. Binder Fluid Mech. xi. 143 The Flettner rotor, which employs the Magnus effect, has been applied to the propulsion of marine vessels. Vertical cylinders are extended some distance above the deck. Each cylinder is rotated about its axis by a small motor, and an air force is produced for moving the craft. 1973Sci. Amer. Apr. 121/2 The drag of the turbulent wake and the sidewise forces of the Magnus effect (the name given the transverse forces produced by the flow pattern around a spinning ball) are carefully considered. They are at the heart of baseball, tennis, golf and high-quality soccer. |