Efficient high‐pressure state equations

A method is presented for a relatively accurate, noniterative, computationally efficient calculation of high‐pressure fluid‐mixture equations of state, especially targeted to gas turbines and rocket engines. Pressures above 1 bar and temperatures above 100 K are addressed. The method is based on curve fitting an effective reference state relative to departure functions formed using the Peng‐Robinson cubic state equation. Fit parameters for H2, O2, N2, propane, methane, n‐heptane, and methanol are given.