Shock tube measurements of the equation of state of argon

We have investigated the equation of state of argon at elevated temperature s and pressures using a new shock tube method. Temperatures in the range of 1280 to 1830 K, and pressures from 6 to 50 MPa were generated behind refle cted shock waves in test gas mixtures of argon with trace amounts of CO and H-2 added. Density was determined from reflected shock pressure and incide nt shock speed measurements using the shock-jump relations. Temperature was determined From the modeling of the 4.7 sum infrared emission of the funda mental vibrational band of thermally-equilibrated CO. The experimentally de termined argon P-rho-T data points are in good agreement with the static-ce ll data of LeCocq and an extrapolation of the equation of state of Stewart and Jacobsen.