Sorry for late reply, I hadn't logged in for a while (been viewing only as guest). I made a basic turboramjet implementation based on those NASA equations. The biggest problem is that some parameters, such as IPR, are almost impossible to find for any jet engine. The code shouldn't be completely wrong, as the engine produces static thrust, unlike a ramjet, one can take off, and the thrust falls off at altitude. But especially the parameter values need tweaking and I haven't been working on this very intensively.