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Aungier's Modified Redlich-Kwong Real Gas Equation Of State
 
Many of the CompAero and TurbAero aerodynamic design and analysis programs feature a very general equation of state for ideal and non-ideal fluids and fluid mixtures developed by Ron Aungier.  This model is a modified form of the popular two-parameter Redlich-Kwong equation of state extended to include the effects of accentric factor and critical-point compressibility factor.  It also employs generalized models for two-phase (liquid-vapor) fluids to handle condensing fluids in turbines.
 
The gas property data required for this equation are: (1) molecular weight, (2) critical temperature, (3) critical pressure, (4) crirtical compressibility factor, (5) accentric factor and (6) a polynomial expression for low-pressure specific heat (Cp) as a function of temperature.  All of these gas property data are readily available for most compounds of interest from several standard publications (e.g., Yaws, C. L., Chemical Properties Handbook, McGraw-Hill, 1999).  Both CompAero and TurbAero offer this equation of state in two stand-alone programs for user convenience as well as in the various design & analysis programs.
 
1) Program RKMOD: an ideal/non-ideal fluid equation-of-state package for a variety of thermodynamic property calculations.
2) Program GASDATA: a gas property database maintenance program to support Program RKMOD and the other programs that
    use its equation of state (including a current database of over 100 compounds).
 
This equation of state is described in:
 
Aungier, R. H., "A Fast, Accurate Real Gas Equation Of State for Fluid Dynamic Analysis Applications", Transactions of the ASME, Journal of Fluids Engineering, June 1995, pp. 277-281. Also in Contributed Papers In Fluids Engineering 1994, ASME FED-Vol. 182, 1994, pp. 1-6 (the original reference).
 
Aungier, R. H., Turbine Aerodynamics: Axial-Flow and Radial-Inflow Turbine Design and Analysis, ASME Press, 2006 (this reference includes the most complete description of the general two-phase flow models).
 
Aungier, R. H., Axial-Flow Compressors: A Strategy for Aerodynamic Design and Analysis, ASME Press, 2003.
 
Aungier, R. H., Centrifugal Compressors: A Strategy for Aerodynamic Design and Analysis, ASME Press, 2000.
 
Aungier, R. H., "Thermodynamic State Relations," The Handbook Of Fluid Dynamics (Johnson, R. W., editor), by CRC Press LLC, 1998, pp. 4-29 - 4-34.