background: engineering
background & motivation
| Supersonic flows past an axisymmetric base
are fundamental but important for many engineering problems, such as
a rocket, re-entry capsule, aerospike nozzle, reusable launch vehicle,
etc. The pressure that establishes itself at the base of a projectile,
whether powered or not, is almost always noticeably lower than that
of the free-stream. |
reusable launch vehicle at JAXA/ISAS. |
This pressure which is determined by the flow field behind the base causes significant
base drag, and the aerodynamics performances of these vehicles are considerably
influenced. Unsteady pressure fluctuation at the base sometimes loses dynamic
stability of a vehicle. Therefore, accurate estimations of base flows and
a resulting force acting on the base are important issues for many engineering
problems, such as for the design of these vehicles. Furthermore, the knowledge
of base flows lies in the ability to control the near wake flow interactions
such that base drag can be reduced and vehicle stability and control can be
enhanced.
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