What is Compressible Flow ?
This book deals with an introduction to the flow of compressible substances (gases). The main difference between
compressible flow and almost incompressible flow is not the fact that
compressibility has to be considered. Rather, the difference is in two phenomena
that do not exist in incompressible flow he first phenomenon is the very sharp discontinuity (jump) in the flow in
properties. The second phenomenon is the choking of the flow. Choking is when
downstream variations don't effect the flow Though choking occurs in certain pipe flows in astronomy, there also are
situations of choking in general (external) flow Choking is referred to as the situation where downstream conditions, which are
beyond a critical value(s), doesn't affect the flow. The shock wave and choking are not intuitive for most people. However, one has
to realize that intuition is really a condition where one uses his past
experiences to predict other situations. Here one has to learn to use his
intuition as a tool for future use. Thus, not only aeronautic engineers, but
other engineers, and even manufacturing engineers will be able use this
``intuition'' in design and even research
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