Shock tube measurements of the equation of state of argon
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1997 by the American Institute of Aeronautics and Astronautics. All rights reserved. We have investigated the equation of state (EOS) of argon at elevated temperatures and pressures using a new shock tube method. Temperatures in the range 1300 to 1900 K, and pressures from 60 to 300 atm were generated behind reflected shock waves in test gas mixtures of argon with trace amounts of CO and H2 added. Density was determined using pressure and shock speed measurements and the shock relations. Temperature was determined by modeling the 4.7(1 infrared emission from the fundamental vibrational band of CO. The experimentally-determined argon P-p- T data points are in good agreement with the static-cell data of LeCocq (1960) and the EOS formulation of Stewart-Jacobsen (1989). Based on these results, the suitability of using the ideal, Peng-Robinson, Van der Waals, and Stewart-Jacobsen EOS in the modeling of reflected shocks in argon is discussed. 1997 American Institute of Aeronautics and Astronautics, Inc.
