Stagnation Properties Calculator (Compressible Flow) implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t5-066

Effect

Computation or source lookup only

Input and validation requirements

The stated pressure formula is undefined at γ=1 because the denominator γ−1 vanishes. The calculator needs explicit validation and rejection for this input.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "static_temperature_K": 288.15,
    "static_pressure_Pa": 101325,
    "mach_number": 0.8,
    "gamma": 1.4
  },
  "expected_outputs": {
    "stagnation_temperature_K": 325.0332,
    "stagnation_pressure_Pa": 154453.75
  },
  "working": "T0/T = 1 + ((1.4−1)/2)(0.8)^2 = 1 + 0.2×0.64 = 1.128. T0 = 288.15×1.128 = 325.0332 K. P0/P = 1.128^(1.4/(1.4−1)) = 1.128^3.5 ≈ 1.524340. P0 = 101325×1.524340 ≈ 154453.75 Pa."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json