The pressure ratio across the wave (p2/p1) is a measure of the change in pressure that occurs when a fluid flows across a wave, such as a shock wave or an expansion wave. The pressure ratio is defined as the ratio of the pressure behind the wave (p2) to the pressure ahead of the wave (p1). The pressure ratio depends on the type, strength, and orientation of the wave, as well as the properties and speed of the fluid.
- Pressure ratio across the wave (p2/p1)
- Specific heat ratio (𝛾)
- Mach number of the flow ahead of the shock (M1)
- Wave angle (β) in rad