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Fig. 2.54 Development of wing leading-edge vortex
1. One-dimensional steady compressible flow and its equations
The problem of incompressible flow is more complicated than that of
compressible flow. In the incompressible flow, the change in density and
temperature caused by velocity difference is small, so the density and
temperature can be regarded as constant approximately, so the parameters
of gas flow are only velocity and pressure. However, in the compressible
flow, the larger velocity difference causes a greater change in density and
temperature, which has a significant impact on the flow. At this time,
the parameters of airflow are velocity, pressure, density, and temperature.