Combustion calculations with the relation on the screen beside the number, and the limits of that relation beside both. Nineteen modules, NASA CEA data bundled offline, for Mac and iPad.
Stoichiometry and equivalence ratio. Heating value. Adiabatic flame temperature, frozen or at equilibrium. Equilibrium composition at a given temperature and pressure.
Rankine–Hugoniot in the pressure–volume plane, with the Rayleigh line, both intersections and all seven regions named. Chapman–Jouguet tangency. The von Neumann state behind the leading shock.
Laminar flame speed, by asymptotic solution or by scaling a measurement. Zeldovich and Lewis numbers, preheat and reaction zone thickness. Flammability limits. Thermal explosion. The stirred-reactor S-curve. Flame stretch. Quenching distance.
Mixture fraction and Burke–Schumann flame structure. Droplet evaporation and combustion, with lifetime and flame standoff. The turbulent regime diagram. Transport properties from the official fitted curves.
Sweep the equivalence ratio and watch the equilibrium peak sit slightly rich of stoichiometric — then raise the pressure, watch dissociation retreat, and watch the peak move back toward one. A chat window can hand you a number. It cannot hand you the shape of that curve, or show you which way it moves when you lean on it.
The theory manual is public. For every one of the nineteen screens it states what the relation assumes, how it is solved, where it stops applying and how accurate the answer is known to be. If the answer to any of those is not good enough for your work, you will know before paying rather than after.
Every screen carries the relation it uses and a standing note of what the model leaves out. Flammability limits are presented as measurements that depend on the apparatus, not as material constants. The equilibrium solver reports its iteration count and its largest element residual, so the trustworthiness of the answer is visible rather than assumed. Where two textbook sources disagree, both values are kept rather than averaged.
Export the conditions and results as CSV at 17 significant digits, so a downstream calculation reproduces exactly. Export any chart as a 2× PNG for a report or as vector PDF for typesetting. Every export carries the conditions it was computed under and the version that produced it.
There is no networking code in the application. No account, no sign-in, no telemetry, nothing stored between sessions. It works on a plane, in an exam hall and in a basement laboratory.