142
P. Liu
Fig. 2.77 Long-range ballistic missile
Fig. 2.78 US pre-researched SR-72 hypersonic vehicle (Mach 6)
and the smaller the density ratio before and after the shock wave. For
example, for the high Mach flow with complete gas, the density ratio
before and after the positive shock wave is about 1/6, while the density
ratio of the real gas in the reentry flight of Apollo spacecraft is about
1/20. According to the conservation of mass, the shock wave is close
to the surface. In this case, with the help of the boundary layer theory,
the order of magnitude analysis of the physical quantities of convective
animals can be carried out and the approximate theory of thin shock layer
can be established.
P. Liu
Fig. 2.77 Long-range ballistic missile
Fig. 2.78 US pre-researched SR-72 hypersonic vehicle (Mach 6)
and the smaller the density ratio before and after the shock wave. For
example, for the high Mach flow with complete gas, the density ratio
before and after the positive shock wave is about 1/6, while the density
ratio of the real gas in the reentry flight of Apollo spacecraft is about
1/20. According to the conservation of mass, the shock wave is close
to the surface. In this case, with the help of the boundary layer theory,
the order of magnitude analysis of the physical quantities of convective
animals can be carried out and the approximate theory of thin shock layer
can be established.