Isentropic Flow Calculator
Calculate thermodynamic properties across an isentropic flow. Isentropic flow is a flow process where entropy remains constant, which occurs in ideal compressible flow with no heat transfer or friction.
Isentropic Flow Results
Enter values and select calculation mode to compute isentropic flow properties.
Isentropic Flow Theory
What is Isentropic Flow?
Isentropic flow is a compressible fluid flow where entropy remains constant. This occurs when:
- The flow is adiabatic (no heat transfer)
- The flow is reversible (no viscous effects or friction)
- No shock waves are present
- The fluid can be modeled as a perfect gas
Key Properties and Terminology
- Stagnation properties: Values when flow is brought to rest isentropically (denoted with subscript ₀)
- Area ratio (A/A*): Ratio of local area to the critical area where M=1
- Mach angle (μ): Angle of Mach waves in supersonic flow, calculated as sin⁻¹(1/M)
- Prandtl-Meyer function (ν): Maximum angle through which supersonic flow can turn in expansion
Applications
Nozzle Design
Isentropic flow relations are used in designing rocket and jet engine nozzles to properly expand supersonic exhaust flow.
Wind Tunnel Testing
Used to calculate flow conditions in different parts of supersonic and hypersonic wind tunnels for aerodynamic testing.
Supersonic Inlets
For designing efficient inlets for supersonic aircraft that slow down air with minimum total pressure loss.
Open Source & Transparent
This tool is open source and the underlying logic is fully transparent. You can view the source code, understand the calculations, and even contribute improvements to make it better for everyone.
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