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Simplified curve fits for the thermodynamic properties of equilibrium air
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Tannehill, J. C. Weilmuenster, K. J. Srinivasan, S. |
| Copyright Year | 1986 |
| Description | New improved curve fits for the thermodynamic properties of equilibrium air were developed. The curve fits are for p = p(e,rho), a = a(e,rho), T = T(e,rho), s = s(e,rho), T = T(p,rho), h = h(p,rho), rho = rho(p,s), e = e(p,s) and a = a(p,s). These curve fits can be readily incorporated into new or existing Computational Fluid Dynamics (CFD) codes if real-gas effects are desired. The curve fits were constructed using Grabau-type transition functions to model the thermodynamic surfaces in a piecewise manner. The accuracies and continuity of these curve fits are substantially improved over those of previous curve fits appearing in NASA CR-2470. These improvements were due to the incorporation of a small number of additional terms in the approximating polynomials and careful choices of the transition functions. The ranges of validity of the new curve fits are temperatures up to 25,000 K and densities from 10 to the minus 7th to 100 amagats (rho/rho sub 0). |
| File Size | 10435340 |
| Page Count | 100 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870019018 |
| Archival Resource Key | ark:/13960/t2s51jm46 |
| Language | English |
| Publisher Date | 1986-06-01 |
| Access Restriction | Open |
| Subject Keyword | Thermodynamics And Statistical Physics Approximation Computational Fluid Dynamics Temperature Effects Subsonic Flow Applications Programs Computers Air Thermodynamic Properties Graphs Charts Thermodynamic Equilibrium Fortran Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
