The pressure coefficient for the flat plate upper surface under the expansion wave (Cp2) is a dimensionless quantity that measures the relative change in pressure on the upper surface of the plate due to the expansion wave that forms when the plate is at a small angle of attack to the supersonic or hypersonic flow.
- Pressure coefficient for upper surface (Cp2)
- Specific heat ratio (𝛾)
- Mach number for upper surface (M1)
- Ratio of static pressure upper surface to the freestream static pressure (p2/p1)