500
P. Liu
Fig. 7.68 Shark fin winglets
is very magical. The car can accommodate five people, but its drag coefficient is 7–8 times higher than that of a huge fuselage that can accommodate
150 people, this is an aerodynamic achievement. For the fuselage of different
aspect ratios, in the 1950s, German aerodynamicist D.Küchemann (Prandtl’s
student, 1911–1976), Theodore von Kármán (1881–1963) et al. carried out
systematic research and obtained many results of great value.
In daily life, people also use the knowledge of aerodynamic drag reduction. For example, when riding a bicycle, if there is a headwind, in order to
reduce the drag, people will consciously bend the waist down to achieve the
purpose of reducing the windward area. Although the big helmet worn by
the racing athlete looks a bit clumsy, wearing such a helmet can reduce the
drag. Compared with not wearing the helmet, the drag is reduced. At the
P. Liu
Fig. 7.68 Shark fin winglets
is very magical. The car can accommodate five people, but its drag coefficient is 7–8 times higher than that of a huge fuselage that can accommodate
150 people, this is an aerodynamic achievement. For the fuselage of different
aspect ratios, in the 1950s, German aerodynamicist D.Küchemann (Prandtl’s
student, 1911–1976), Theodore von Kármán (1881–1963) et al. carried out
systematic research and obtained many results of great value.
In daily life, people also use the knowledge of aerodynamic drag reduction. For example, when riding a bicycle, if there is a headwind, in order to
reduce the drag, people will consciously bend the waist down to achieve the
purpose of reducing the windward area. Although the big helmet worn by
the racing athlete looks a bit clumsy, wearing such a helmet can reduce the
drag. Compared with not wearing the helmet, the drag is reduced. At the