Determination of the Free-Stream Density from Flight Test Data of Reentry Spacecraft

Details Determination of the Free-Stream Density from Flight Test Data of Reentry Spacecraft Determination of the Free-Stream Density from Flight Test Data of Reentry Spacecraft

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.563..373z&link_type=abstract

Proceedings of the Fifth European Symposium on Aerothermodynamics for Space Vehicles (ESA SP-563). 8-11 November 2004, Cologne,

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Two methods to infer free-stream densities from inflight measurements of Pitot pressure and flight velocity during reentry are presented that focus on the minimisation of uncertainties due to high-temperature real-gas effects and atmospheric density fluctuation. A numerical approach leads to a curve-fit function that yields the ratio pt2/q∞ for velocities between 0.5 km/s and 10 km/s and altitudes up to 90 km. An analytically derived correlation is also provided. Both techniques account for equilibrium real-gas effects thus achieving very high accuracies. Independently of potential atmospheric fluctuation, remaining errors are less than 1 % for almost the entire spectrum and less than 0.3 % for typical lifting reentry.

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