ASTM E637 – 05 Calculation of Stagnation Enthalpy

This test method calculates the stagnation enthalpy from experimental observations of stagnation-point heat transfer and stagnation pressure using heat transfer theory. The values expressed in SI units should be considered the standard.

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ASTM E637 – 05 aims to give a standard computation of an aerodynamic simulation device’s stagnation enthalpy using heat transfer theory and measured stagnation point heat transfer and pressure measurements. For ablation calculations, the stagnation enthalpy acquired using this test method provides a consistent set of data and heat transfer and stagnation pressure.

Procedure

The equation calculates the stagnation enthalpy with the required constants for the Mach number, shape factor, and test gas.

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Data

q √ R/P_t2 = K_i (H_e – H_w)

Where q is stagnation-point heat transfer rate, W/m² (or Btu/ft²·s), P_t^₂ is model stagnation pressure, Pa (or atm.), R is hemispherical nose radius, m (or ft.), He is stagnation enthalpy, J/kg (or Btu/lb.)

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