“台风”的空气动力特征：稳定还是不稳定？

Aerodynamic Characteristics of Eurofighter Typhoon

Perfection in airframe performance can give the pilot battle-winning edge, providing that airframe is part of the Eurofighter Typhoon Weapon System. 

Eurofighter Typhoon has a foreplane/delta configuration which is, by nature, aerodynamically unstable.

The instability of the aircraft is derived from the position of a theoretical “pressure point” on the longitudinal axis of the aircraft. This is calculated from the contribution to lift from each of the aircraft components (the wings, the canards, fuselage etc). If the pressure point is in front of the centre of gravity on the longitudinal axis, the aircraft is aerodynamically unstable and it is impossible for a human to control it.

With the Eurofighter Typhoon, in subsonic flight the pressure point lies in front of the centre of gravity, therefore making the aircraft aerodynamically unstable, and is why Eurofighter Typhoon has such a complex Flight Control System – computers react quicker than a pilot.

When Eurofighter Typhoon crosses into supersonic flight, the pressure point moves behind the centre of gravity, giving a stable aircraft.

The advantages of an intentionally unstable design over that of a stable arrangement include greater agility – particularly at subsonic speeds - reduced drag, and an overall increase in lift (also enhancing STOL performance).

 

所有跟帖： 

• 文中的“稳定”和“不稳定”，指的是“静”的 -TBz- ♂ (90 bytes) () 05/29/2012 postreply 17:25:52