Calculated Thermodynamic Properties of Real Hydrogen Up to 30,000 Atmospheres and 3500 Deg K

Abstract

Isentropic data for real hydrogen are calculated in a range of pressures up to 30,000 atmospheres and temperatures up to 3500 0 K. The effects of ionization, excitation, and dissociation are considered negligible because of the relatively low temperatures and high densities involved. The effects of the intermolecular force are accounted for by fitting a virial coefficient equation to low temperature high density experimental data. These calculated data in turn are fitted to an empirical entropic equation of state. This particular equation of state is convenient for describing many thermodynamic processes.

Imperfect gas effect in real hydrogen drives

“…These calculations utilized the equations for thermodynamic properties from Ref. 4. Although this data lacks experimental verification above 600°K, it does continue the trend of the most reliably established properties of hydrogen.…”

“…For these conditions, the assumption of an ideal gas is inadequate due to the existence of large intermolecular forces. 4 Huber 5 has calculated performance of a shock tube using unheated hydrogen drivers at pressures up to 125 atm. The development of an expansion tunnel at LRC required more extensive real hydrogen driver performance calculations.…”

“…Shadowgraph pictures were taken of all test runs. 4 The test model was a flat plate 15.5 in. long and 10 in.…”