NASA has released CEA v3, a modernized version of its propulsion analysis software, featuring improved integration with modern programming environments and an expanded thermochemical database.

NASA has updated its Chemical Equilibrium with Applications (CEA) code, a foundational tool used for propulsion system analysis, shock, and detonation calculations. The new version, CEA v3, modernizes the legacy CEA2 Fortran code into a Fortran 2008 object-oriented package. This update, developed under NASA Engineering and Safety Center Activity TI-22-01730, aims to improve software maintainability and integration with modern engineering workflows while preserving backward compatibility.

Technical Improvements and Compatibility

The original CEA2 code, released in 2002, faced challenges regarding maintenance and integration due to its procedural Fortran structure and lack of a subroutine interface. CEA v3 addresses these issues by utilizing stricter typing, a thread-safe equilibrium solver, and object-oriented data structures. The software now supports direct interfaces for Python, C, MATLAB, and Excel, allowing for easier use in automated design frameworks and high-volume studies. Despite these architectural changes, the software maintains a legacy command-line interface to ensure existing input files and workflows remain functional.

Expanded Database and Performance

NASA has expanded the software's thermodynamic database to include species relevant to next-generation propulsion, such as green propellants like ADN, HAN, and LMP-103S, and sustainable aviation fuels like n-Butanol. While individual equilibrium calculations in CEA v3 are approximately 40 percent slower than in CEA2—a difference of roughly 0.004 seconds per case—the new architecture offers significant gains for large-scale workflows. In benchmark testing, a sweep of 108,500 cases was completed in 1.11 seconds using CEA v3, compared to approximately 15 minutes with the legacy version, representing an 800-fold increase in speed for such tasks.