# Isentropic Flow Calculator

This model converts between static and total states for a calorically-perfect gas. It incorporates the usual isentropic relations; however, it makes no representations about the spatial scale of the flow or whether it is internal or external (so does not represent the spatial aspects of quasi-1D duct flows, for example the area ratio). Also this model solves some special situations where there is incomplete information about both states.

Press **⏎** to see the model. Try your own inputs or the examples below. Refresh your browser to clear results.

## Mach number and static state

- Choose a Mach number of 0.5 M = 0.5
**⏎**. The model infers temperature ratio and other ratios. These ratios express the difference between the total and static state of the fluid. - To find the total state of the fluid, assert the static temperature and pressure, such as T = 300
**⏎**K and P = 1**⏎**bar. The model then uses the ratios calculated in step 1 to infer the total state.

Key results are the total state Total **⏎ **and the static state Static **⏎**.

## Total state and a static state variable

- Choose a total temperature of 2020 K Total.T = 2020
**⏎**and total density of 5 kg/m³ Total.r = 5**⏎**. - Now choose the desired property for the static state, such as a temperature of 500 K T = 500
**⏎**.

## Advanced: Mixed states and a branch

- Choose a static temperature of 200 K T = 200
**⏎**and mass flow rate per unit area of 100 kg/m²/s G = 100**⏎**. - Now choose the desired total pressure, such as 10 bar Total.P = 10
**⏎**. - Finally, choose which branch of the solution to solve for dP = false
**⏎**.