Computation of Drag of a Ballistic Reentry Body at Various …
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Fig. 10 Cumulative C D distribution for typical Mach numbers
in the nose and the first cone from subsonic to hypersonic Mach numbers. The drag
due to flare is very low in subsonic Mach number. The flare contribution to drag
initially increases with Mach number reaches a maximum at M = 1.8 and falls at
hypersonic Mach number. The base drag is indicated as a vertical jump at the vehicle
end. The deceleration level of a ballistic reentry body is a function of drag and mass
of the object. Table 1 shows the deceleration levels for various Mach numbers in ‘g’
Mass of the configuration is taken as 508 kg [5]. It is observed that the deceleration
level is the highest at hypersonic Mach number. It is also observed that the standards
are less than one at M = 0.8 to 0.5.
Table 1 Decelaration variation for various Mach numbers
Mach
Deceleration in ‘g’
Mach
Deceleration in ‘g’
0.3
1.13
1.05
2.29
0.5
0.921
1.2
2.98
0.7
0.85
1.8
2.99
0.8
0.889
2
3.59
0.9
1.31
3
4.87
0.93
1.52
5
7.36
0.95
1.69
6
8.81
0.98
1.99