COMPARATIVE STUDY ON THE DESCRIPTION OF THERMAL PROPERTIES OF COMMON GASES BY DIFFERENT STATE EQUATIONS AND THE CORRECTION OF REDLICH-KWONG EQUATION PARAMETER

In response to the increasing demand for accurate prediction of gas thermal properties in engineering applications, this paper compares and studies the application effects of three state equations, namely van der Waals equation, Redlich-Kwong equation and Peng-Robinson equation, in the calculation of thermal properties of common gases such as nitrogen. The advantages and disadvantages of different state equations in the calculation of thermal properties of different gases are discussed. In addition, we propose a modified optimization method for the parameter b of the Redlich-Kwong equation. By adjusting the value of b, the calculated results of the modified Redlich-Kwong equation have significantly improved their consistency with the reference data, providing new ideas and methods for theoretical research and industrial applications.