Impact Pressure - Isentropic Flow

Isentropic Flow

In isentropic flow the ratio of total pressure to static pressure is given by:

where:

is total pressure

is static pressure

is the ratio of specific heats

is the freestream Mach number

Taking to be 1.4, and since

Expressing the incompressible dynamic pressure as and expanding by the binomial series gives:

where:

is dynamic pressure